Triumph (TGI) 10-K 21 May 15 2015 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Mar. 31, 2015	18-May-15	Sep. 30, 2014
Entity Information [Line Items]
Document Period End Date	31-Mar-15
Entity Registrant Name	TRIUMPH GROUP INC
Entity Central Index Key	1021162
Document Type	10-K
Amendment Flag	FALSE
Current Fiscal Year End Date	-28
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$3,248,000,000
Entity Common Stock, Shares Outstanding		49,273,525
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Entity Current Reporting Status	Yes

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$32,617	$28,998
Trade and other receivables, less allowance for doubtful accounts of $5,372 and $3,900	521,846	517,304
Inventories, net of unliquidated progress payments of $124,128 and $164,450	1,272,879	1,111,767
Rotable assets	48,820	41,666
Deferred Tax Assets, Net, Current	145,352	57,308
Prepaid and other current assets	23,100	24,897
Total current assets	2,044,614	1,781,940
Property and equipment, net	948,902	931,430
Goodwill	2,030,594	1,791,891
Intangible assets, net	972,389	978,171
Other, net	72,944	69,954
Total assets	6,069,443	5,553,386
Current liabilities:
Current portion of long-term debt	42,255	49,575
Accounts payable	427,448	317,334
Accrued expenses	427,740	273,290
Total current liabilities	897,443	640,199
Long-term debt, less current portion	1,337,141	1,500,808
Accrued pension and other postretirement benefits, noncurrent	538,381	508,524
Deferred income taxes, noncurrent	406,641	385,188
Other noncurrent liabilities	754,053	234,756
Stockholders’ equity:
Common stock, $.001 par value, 100,000,000 shares authorized, 50,123,035 and 49,590,273 shares issued; 50,123,105 and 49,531,740 shares outstanding	51	52
Capital in excess of par value	851,940	866,281
Treasury stock, at cost, 0 and 58,533 shares	-203,514	-19,134
Accumulated other comprehensive (loss) income	-198,910	-18,908
Retained earnings	1,686,217	1,455,620
Total stockholders' equity	2,135,784	2,283,911
Total liabilities and stockholders' equity	$6,069,443	$5,553,386

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, except Share data, unless otherwise specified
Trade and other receivables, allowance for doubtful accounts (in dollars)	$6,475	$6,535
Inventories, unliquidated progress payments (in dollars)	$189,923	$165,019
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	52,459,020	52,459,020
Common stock, shares outstanding	49,273,053	52,159,020
Treasury stock, shares outstanding	3,187,867	300,000

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Net Income	$238,697	$206,256	$297,347
Other comprehensive (loss) income:
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	-46,949	-3,315	-1,832
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, Net of Tax	-31	37	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax	-122,636	45,995	-45,976
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	-128,800	44,014	-49,833
Pension and postretirement adjustments, net of income taxes of ($29,710), ($77,523) and $70,349, respectively	0	9,402	199
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Net of Tax	-6,133	-11,346	-4,056
Change in fair value of cash flow hedge, net of income taxes of ($1), $222 and $698, respectively	4,098	-1,384	-41
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	-4,253	1,365	-1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	-155	-19	-42
Total other comprehensive (loss) income	-180,002	42,064	-51,666
Total comprehensive income	$58,695	$248,320	$245,681

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	$12	$11	($26)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	71,060	27,456	-27,375
Unrealized gain on cash flow hedge, tax	2,463	884	25
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Tax	0	-5,647	-119
Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Tax	3,684	-6,814	-2,453
Statement
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit), Tax	$19	$21	$0

Consolidated_Stockholders_Equi

Consolidated Stockholders' Equity (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		$2,135,784	$2,283,911	$2,045,158	$1,793,369
Net Income		238,697	206,256	297,347
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		-46,949	-3,315	-1,832
Other Comprehensive Income (Loss), Net of Tax		-180,002	42,064	-51,666
Stock Issued During Period, Value, Conversion of Convertible Securities		-19,387	14,002	2,597
Shares issued to settle the conversion benefit of the notes (in shares)		0	2,290,755	395,269
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature	2,725
Treasury Stock, Shares, Acquired		-2,923,011	-300,000
Treasury Stock, Value, Acquired, Cost Method		-184,380	-19,134
Stock Issued During Period, Value, Stock Options Exercised		720	290	2,138
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		45,782	18,170	128,356
Dividends, Cash		-8,100	-8,344	-8,005
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition		1,272	6,306	6,590
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures		1,600	61,413	97,947
Adjustments Related to Tax Withholding for Share-based Compensation		-673	-2,726	-1,840
Shares Paid for Tax Withholding for Share Based Compensation		-10,338	-34,353	-30,277
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation		1,001	39	4,628
Accumulated Translation Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax		-46,949	-3,315
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		51	52	50	50
Balance, Shares Outstanding		49,273,053	52,159,020	50,123,035	49,531,740
Stock Issued During Period, Value, Conversion of Convertible Securities		-1	2	0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition		0	0	0
Additional Paid-in Capital [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		851,940	866,281	848,372	833,935
Stock Issued During Period, Value, Conversion of Convertible Securities		-19,386	14,000	2,597
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature	2,725
Stock Issued During Period, Value, Stock Options Exercised		720	290	622
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition		1,272	6,306	6,590
Adjustments Related to Tax Withholding for Share-based Compensation		-673	-2,726	0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation		1,001	39	4,628
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		-203,514	-19,134	0	-1,716
Treasury Stock, Value, Acquired, Cost Method		-184,380	-19,134
Stock Issued During Period, Value, Stock Options Exercised		0	0	3,556
Adjustments Related to Tax Withholding for Share-based Compensation		0	0	-1,840
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		-198,910	-18,908	-60,972	-9,306
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		-46,949	-3,315	-1,832
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance		1,686,217	1,455,620	1,257,708	970,406
Net Income		238,697	206,256	297,347
Stock Issued During Period, Value, Stock Options Exercised		0	0	-2,040
Dividends, Cash		-8,100	-8,344	-8,005
Accumulated Defined Benefit Plans Adjustment [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax		-128,800	44,014	-49,833
Accumulated Defined Benefit Plans Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax		128,800	-44,014	49,833
Derivative [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax			1,481	-1
Derivative [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax			1,481	-1
Interest Rate Swap [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax		-3,156
Interest Rate Swap [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax		-3,156
Foreign Exchange Contract [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax		-1,097
Foreign Exchange Contract [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Net of Tax		($1,097)	($116)

Consolidated_Stockholders_Equi1

Consolidated Stockholders' Equity Consolidated Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Pension and postretirement benefit adjustments, income taxes	$74,763	$0	($29,710)
Unrealized gain on cash flow hedge, tax	2,463	884	25
Common Stock, Dividends, Per Share, Cash Paid	$0.16	$0.16		$0.16
Foreign Exchange Contract [Member]
Unrealized gain on cash flow hedge, tax	490	-72	-1
Interest Rate Swap [Member]
Unrealized gain on cash flow hedge, tax	$2,014	$945	$0

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Net sales	$3,888,722	$3,763,254	$3,702,702
Operating costs and expenses:
Cost of sales (exclusive of depreciation and amortization shown separately below)	3,141,453	2,911,802	2,763,488
Selling, general and administrative	285,773	254,715	241,349
Depreciation and amortization	158,323	164,277	129,506
Restructuring Charges	3,193	31,290	0
Acquisition and integration expenses	0	0	2,665
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	1,166	34,481
Proceeds from Legal Settlements		0	0
Operating expenses	3,454,049	3,363,250	3,171,489
Operating income	434,673	400,004	531,213
Interest expense and other	85,379	87,771	68,156
Income from continuing operations before income taxes	349,294	312,233	463,057
Income tax expense	110,597	105,977	165,710
Income from continuing operations	238,697
Net Income	$238,697	$206,256	$297,347
Earnings per share-basic:
Net income (in dollars per share)	$4.70	$3.99	$5.99
Weighted-average common shares outstanding-basic (in shares)	50,796	51,711	49,663
Earnings per share-diluted:
Net income (in dollars per share)	$4.68	$3.91	$5.67
Weighted-average common shares outstanding-diluted (in shares)	51,005	52,787	52,446

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Operating Activities
Net Income	$238,697	$206,256	$297,347
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	158,323	164,277	129,506
Amortization of acquired contract liabilities	-75,733	-42,629	-25,644
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	-1,166	-34,481
Accretion of debt discount	1,577	1,946	548
Other amortization included in interest expense	8,135	6,702	3,638
Provision for doubtful accounts receivable	172	2,191	1,974
Deferred Income Tax Expense (Benefit)	105,277	102,869	186,767
Employee stock-based compensation	1,272	4,653	6,367
Changes in assets and liabilities, excluding the effects of acquisitions and dispositions of businesses:
Trade and other receivables	69,500	-46,378	24,718
Inventories	49,536	-94,341	-140,025
Rotable assets	-7,153	-6,813	1,683
Prepaid expenses and other current assets	1,589	-406	752
Accounts payable, accrued expenses and other current liabilities	95,167	-60,209	-57,861
Accrued pension and other postretirement benefits	-180,569	-100,929	-142,975
Other	1,542	-3,218	-358
Net cash provided by operating activities	467,332	135,137	320,918
Investing Activities
Capital expenditures	-110,004	-206,414	-126,890
Reimbursement Revenue	653	9,086	5,156
Proceeds from sale of assets	3,167	45,047	3,993
Acquisitions, net of cash acquired	38,281	-94,456	-349,632
Net cash used in investing activities	-67,903	-246,737	-467,373
Financing Activities
Net increase (decrease) in revolving credit facility	-46,150	98,557	-224,151
Proceeds from issuance of long-term debt	508,960	451,003	528,135
Repayment of debt and capital lease obligations	-655,860	-416,645	-142,338
Payment of deferred financing costs	-6,487	-3,297	-8,838
Payments for Repurchase of Common Stock	-184,380	19,134	0
Dividends paid	-8,100	-8,344	-8,005
Repayment of governmental grant	-3,198	3,456	-1,090
Repurchase of restricted shares for minimum tax obligation	-673	-2,726	-1,840
Proceeds from exercise of stock options, including excess tax benefit of $4,628, $1,880, and $150 in 2013, 2012, and 2011	720	329	6,766
Net cash (used in) provided by financing activities	-395,168	103,199	148,639
Effect of exchange rate changes on cash	-642	5,362	191
Net change in cash	3,619	-3,039	2,375
Cash at beginning of period	28,998	32,037	29,662
Cash at end of period	32,617	28,998	32,037
Retained Earnings [Member]
Operating Activities
Net Income	$238,697	$206,256	$297,347

Consolidated_Statements_of_Cas1

Consolidated Statements of Cash Flows (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Benefits of tax deductions in excess of recognized compensation expense	$0	$39	$4,628

BASIS_OF_PRESENTATION_AND_ORGA

BASIS OF PRESENTATION AND ORGANIZATION	12 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	BACKGROUND AND BASIS OF PRESENTATION
	Triumph Group, Inc. ("Triumph") is a Delaware corporation which, through its operating subsidiaries, designs, engineers, manufactures and sells products for the global aerospace original equipment manufacturers ("OEMs") of aircraft and aircraft components and repairs and overhauls aircraft components and accessories for commercial airline, air cargo carrier and military customers on a worldwide basis. Triumph and its subsidiaries (collectively, the "Company") is organized based on the products and services that it provides. Under this organizational structure, the Company has three reportable segments: the Aerostructures Group, the Aerospace Systems Group and the Aftermarket Services Group.
	The Aerostructures segment consists of the Company's operations that manufacture products primarily for the aerospace OEM market. The Aerostructures segment's revenues are derived from the design, manufacture, assembly and integration of metallic and composite aerostructures and structural components, including aircraft wings, fuselage sections, tail assemblies, engine nacelles, flight control surfaces, and helicopter cabins. Further, the segment's operations also design and manufacture composite assemblies for floor panels and environmental control system ducts. These products are sold to various aerospace OEMs on a global basis.
	The Aerospace Systems segment consists of the Company's operations that also manufacture products primarily for the aerospace OEM market. The segment's operations design and engineer mechanical and electromechanical controls, such as hydraulic systems, main engine gearbox assemblies, engine control systems, accumulators, mechanical control cables and non-structural cockpit components. These products are sold to various aerospace OEMs on a global basis.
	The Aftermarket Services segment consists of the Company's operations that provide maintenance, repair and overhaul services to both commercial and military markets on components and accessories manufactured by third parties. Maintenance, repair and overhaul revenues are derived from services on auxiliary power units, airframe and engine accessories, including constant-speed drives, cabin compressors, starters and generators, and pneumatic drive units. In addition, the segment's operations repair and overhaul thrust reversers, nacelle components and flight control surfaces. The segment's operations also perform repair and overhaul services and supply spare parts for various types of cockpit instruments and gauges for a broad range of commercial airlines on a worldwide basis.
	Repair services generally involve the replacement of parts and/or the remanufacture of parts, which is similar to the original manufacture of the part. The processes that the Company performs related to repair and overhaul services are essentially the repair of wear parts or replacement of parts that are beyond economic repair. The repair service generally involves remanufacturing a complete part or a component of a part.
	The accompanying consolidated financial statements include the accounts of Triumph and its wholly-owned subsidiaries. Intercompany accounts and transactions have been eliminated from the consolidated financial statements.
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

SUMMARY_OF_SIGNIFICANT_ACCOUNT

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Cash Equivalents
	Cash equivalents consist of highly liquid investments with a maturity of three months or less at the time of purchase. Fair value of cash equivalents approximates carrying value.
	Trade and Other Receivables, net
	Trade and other receivables are recorded net of an allowance for doubtful accounts. Trade and other receivables include amounts billed and currently due from customers, amounts currently due but unbilled, certain estimated contract changes and amounts retained by the customer pending contract completion. Unbilled amounts are generally billed and collected within one year. The Company performs ongoing credit evaluations of its customers and generally does not require collateral. The Company records the allowance for doubtful accounts based on prior experience and for specific collectibility matters when they arise. The Company writes off balances against the reserve when collectibility is deemed remote. The Company's trade and other receivables are exposed to credit risk; however, the risk is limited due to the diversity of the customer base.
	Trade and other receivables, net comprised of the following:
		March 31,
		2015			2014
	Billed	$	475,913		$	487,344
	Unbilled	39,222			12,333
	Total trade receivables	515,135			499,677
	Other receivables	13,186			24,162
	Total trade and other receivables	528,321			523,839
	Less: Allowance for doubtful accounts	(6,475		)	(6,535		)
	Total trade and other receivables, net	$	521,846		$	517,304
	Inventories
	The Company records inventories at the lower of cost (average-cost or specific-identification methods) or market. Costs on long-term contracts and programs in progress represent recoverable costs incurred for production or contract-specific facilities and equipment, allocable operating overhead and advances to suppliers. Pursuant to contract provisions, agencies of the U.S. Government and certain other customers have title to, or a security interest in, inventories related to such contracts as a result of advances, performance-based payments, and progress payments. The Company reflects those advances and payments as an offset against the related inventory balances. The Company expenses general and administrative costs related to products and services provided essentially under commercial terms and conditions as incurred. The Company determines the costs of inventories by the first-in, first-out or average cost methods.
	Work-in-process inventory includes capitalized pre-production costs. Company policy allows for the capitalization of pre-production costs after it establishes a contractual arrangement with a customer that explicitly states that the cost of recovery of pre-production costs is allowed.
	Capitalized pre-production costs include nonrecurring engineering, planning and design, including applicable overhead, incurred before production is manufactured on a regular basis. Significant customer-directed work changes can also cause pre-production costs to be incurred. These costs are generally recovered over a contractually determined number of ship set deliveries and the Company believes these amounts will be fully recovered (see Note 5 for further discussion).
	Advance Payments and Progress Payments
	Advance payments and progress payments received on contracts-in-process are first offset against related contract costs that are included in inventory, with any excess amount reflected in current liabilities under the Accrued expenses caption within the accompanying Consolidated Balance Sheets.
	Property and Equipment
	Property and equipment, which includes equipment under capital lease and leasehold improvements, are recorded at cost and depreciated over the estimated useful lives of the related assets, or the lease term if shorter in the case of leasehold improvements, by the straight-line method. Buildings and improvements are depreciated over a period of 15 to 39.5 years, and machinery and equipment are depreciated over a period of 7 to 15 years (except for furniture, fixtures and computer equipment which are depreciated over a period of 3 to 10 years).
	Goodwill and Intangible Assets
	The Company accounts for purchased goodwill and intangible assets in accordance with Accounting Standards Codification ("ASC") 350, Intangibles—Goodwill and Other. Under ASC 350, purchased goodwill and intangible assets with indefinite lives are not amortized; rather, they are tested for impairment on at least an annual basis. Intangible assets with finite lives are amortized over their useful lives. Upon acquisition, critical estimates are made in valuing acquired intangible assets, which include but are not limited to: future expected cash flows from customer contracts, customer lists, and estimating cash flows from projects when completed; tradename and market position, as well as assumptions about the period of time that customer relationships will continue; and discount rates. Management's estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from the assumptions used in determining the fair values.
	The Company's operating segments of Aerostructures, Aerospace Systems and Aftermarket Services are also its reporting units. The Chief Executive Officer and the Chief Financial Officer comprise the Company's Chief Operating Decision Maker ("CODM"). The Company's CODM evaluates performance and allocates resources based upon review of segment information. Each of the operating segments is comprised of a number of operating units which are considered to be components. The components, for which discrete financial information exists, are aggregated for purposes of goodwill impairment testing. The Company's acquisition strategy is to acquire companies that complement and enhance the capabilities of the operating segments of the Company. Each acquisition is assigned to either the Aerostructures reporting unit, the Aerospace Systems reporting unit or the Aftermarket Services reporting unit. The goodwill that results from each acquisition is also assigned to the reporting unit to which the acquisition is allocated, because it is that reporting unit which is intended to benefit from the synergies of the acquisition.
	The Company assesses whether goodwill impairment exists using both the qualitative and quantitative assessments. The qualitative assessment involves determining whether events or circumstances exist that indicate it is more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill. If based on this qualitative assessment the Company determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount or if the Company elects not to perform a qualitative assessment, a quantitative assessment is performed using a two-step approach required by ASC 350 to determine whether a goodwill impairment exists at the reporting unit.
	The first step of the quantitative test is to compare the carrying amount of the reporting unit's assets to the fair value of the reporting unit. If the fair value exceeds the carrying value, no further work is required and no impairment loss is recognized. If the carrying amount exceeds the fair value, then the second step is required to be completed, which involves allocating the fair value of the reporting unit to each asset and liability, with the excess being applied to goodwill. An impairment loss occurs if the amount of the recorded goodwill exceeds the implied goodwill. The determination of the fair value of our reporting units is based, among other things, on estimates of future operating performance of the reporting unit being valued. We are required to complete an impairment test for goodwill and record any resulting impairment losses at least annually. Changes in market conditions, among other factors, may have an impact on these estimates and require interim impairment assessments.
	When performing the two-step quantitative impairment test, the Company's methodology includes the use of an income approach which discounts future net cash flows to their present value at a rate that reflects the Company's cost of capital, otherwise known as the discounted cash flow method ("DCF"). These estimated fair values are based on estimates of future cash flows of the businesses. Factors affecting these future cash flows include the continued market acceptance of the products and services offered by the businesses, the development of new products and services by the businesses and the underlying cost of development, the future cost structure of the businesses, and future technological changes. The Company also incorporates market multiples for comparable companies in determining the fair value of our reporting units. Any such impairment would be recognized in full in the reporting period in which it has been identified.
	The Company incurred no impairment of goodwill as a result of our annual goodwill impairment tests in fiscal years 2015, 2014 or 2013. In the fourth quarter of fiscal 2015, the Company chose to perform the quantitative assessment, in lieu of the qualitative assessment for each of the Company's three reporting units, which indicated that the fair value of the reporting unit exceeded its carrying amount, including goodwill.
	As of March 31, 2015 and 2014, the Company had a $438,400 indefinite-lived intangible asset associated with the tradenames acquired in the acquisitions of Vought Aircraft Industries, Inc. ("Vought") and Embee, Inc. ("Embee"). The Company assesses whether indefinite-lived intangible assets impairment exists using both the qualitative and quantitative assessments. The qualitative assessment involves determining whether events or circumstances exist that indicate it is more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying amount. If based on this qualitative assessment, the Company determines it is not more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying amount or if the Company elects not to perform a qualitative assessment, a quantitative assessment is performed to determine whether an indefinite-lived intangible asset impairment exists. We test the indefinite-lived intangible assets for impairment by comparing the carrying value to the fair value based on current revenue projections of the related operations, under the relief from royalty method. Any excess of the carrying value over the amount of fair value is recognized as an impairment.
	The Company incurred no impairment of indefinite-lived intangible assets as a result of our annual indefinite-lived intangible assets impairment tests in fiscal years 2015, 2014 or 2013. In the fourth quarter of fiscal 2015, the Company chose to perform the quantitative assessment, in lieu of the qualitative assessment, for each of the Company's indefinite-lived intangible assets, which indicated that the fair value of the indefinite-lived intangible assets exceeded its carrying amount.
	Finite-lived intangible assets are amortized over their useful lives ranging from 3 to 32 years. The Company continually evaluates whether events or circumstances have occurred that would indicate that the remaining estimated useful lives of long-lived assets, including intangible assets, may warrant revision or that the remaining balance may not be recoverable. Intangible assets are evaluated for indicators of impairment. When factors indicate that long-lived assets, including intangible assets, should be evaluated for possible impairment, an estimate of the related undiscounted cash flows over the remaining life of the long-lived assets, including intangible assets, is used to measure recoverability. Some of the more important factors management considers include the Company's financial performance relative to expected and historical performance, significant changes in the way the Company manages its operations, negative events that have occurred, and negative industry and economic trends. If the carrying amount is less than the estimated fair value, measurement of the impairment will be based on the difference between the carrying value and fair value of the asset group, generally determined based on the present value of expected future cash flows associated with the use of the asset.
	Deferred Financing Costs
	Financing costs are deferred and amortized to Interest expense and other in the accompanying Consolidated Statements of Income over the related financing period using the effective interest method or the straight-line method when it does not differ materially from the effective interest method. Deferred financing costs, net of accumulated amortization of $17,850 and $19,499, respectively, are recorded in Other, net in the accompanying Consolidated Balance Sheets as of March 31, 2015 and 2014. Make-whole payments in connection with early debt retirements are classified as cash flows used in financing activities.
	Acquired Contract Liabilities, net
	In connection with several of our acquisitions, we assumed existing long-term contracts. Based on our review of these contracts, we concluded that the terms of certain contracts to be either more or less favorable than could be realized in market transactions as of the date of the acquisition. As a result, we recognized acquired contract liabilities, net of acquired contract assets as of the acquisition date of each respective acquisition, based on the present value of the difference between the contractual cash flows of the executory contracts and the estimated cash flows had the contracts been executed at the acquisition date. The liabilities principally relate to long-term life of program contracts that were initially executed at several years prior to the respective acquisition (see Note 3 of "Notes to Consolidated Financial Statements" for further discussion).
	The Company measured these net liabilities under the measurement provisions of ASC 820, Fair Value Measurements and Disclosures, which is based on the price to transfer the obligation to a market participant at the measurement date, assuming that the net liabilities will remain outstanding in the marketplace. Fair value estimates are based on a complex series of judgments about future events and uncertainties and rely heavily on estimates and assumptions. The judgments used to determine the estimated fair value assigned to each long-term contracts can materially impact our results of operations.
	Included in the net sales of the Aerostructure and Aerospace Systems group is the non-cash amortization of acquired contract liabilities recognized as fair value adjustments through purchase accounting from various acquisitions. The Company recognized net amortization of contract liabilities of $75,733, $42,629 and $25,644 in the fiscal years ended March 31, 2015, 2014 and 2013, respectively, and such amounts have been included in revenues in results of operations. The balance of the liability as of March 31, 2015 is $644,950 and, based on the expected delivery schedule of the underlying contracts, the Company estimates annual amortization of the liability as follows: 2016—$130,087; 2017—$127,003; 2018—$119,207; 2019—$115,550; and 2020—$69,090.
	Revenue Recognition
	Revenues are generally recognized in accordance with the contract terms when products are shipped, delivery has occurred or services have been rendered, pricing is fixed or determinable, and collection is reasonably assured. The Company's policy with respect to sales returns and allowances generally provides that the customer may not return products or be given allowances, except at the Company's option. Accruals for sales returns, other allowances and estimated warranty costs are provided at the time of shipment based upon past experience.
	A significant portion of the Company's contracts are within the scope of ASC 605-35, Revenue—Construction-Type and Production-Type Contracts, and revenue and costs on contracts are recognized using the percentage-of-completion method of accounting. Accounting for the revenue and profit on a contract requires estimates of (1) the contract value or total contract revenue, (2) the total costs at completion, which is equal to the sum of the actual incurred costs to date on the contract and the estimated costs to complete the contract's scope of work and (3) the measurement of progress towards completion. Depending on the contract, the Company measures progress toward completion using either the cost-to-cost method or the units-of-delivery method, with the great majority measured under the units-of-delivery method.
	•	Under the cost-to-cost method, progress toward completion is measured as the ratio of total costs incurred to estimated total costs at completion. Costs are recognized as incurred. Profit is determined based on estimated profit margin on the contract multiplied by progress toward completion. Revenue represents the sum of costs and profit on the contract for the period.
	•	Under the units-of-delivery method, revenue on a contract is recorded as the units are delivered and accepted during the period at an amount equal to the contractual selling price of those units. The costs recorded on a contract under the units-of-delivery method are equal to the total costs at completion divided by the total units to be delivered. As contracts can span multiple years, the Company often segments the contracts into production lots for the purposes of accumulating and allocating cost. Profit is recognized as the difference between revenue for the units delivered and the estimated costs for the units delivered.
	Adjustments to original estimates for a contract's revenues, estimated costs at completion and estimated total profit are often required as work progresses under a contract, as experience is gained and as more information is obtained, even though the scope of work required under the contract may not change, or if contract modifications occur. These estimates are also sensitive to the assumed rate of production. Generally, the longer it takes to complete the contract quantity, the more relative overhead that contract will absorb. The impact of revisions in cost estimates is recognized on a cumulative catch-up basis in the period in which the revisions are made. Provisions for anticipated losses on contracts are recorded in the period in which they become probable ("forward losses") and are first offset against costs that are included in inventory, with any remaining amount reflected in accrued contract liabilities in accordance with ASC 605-35. Revisions in contract estimates, if significant, can materially affect results of operations and cash flows, as well as valuation of inventory. Furthermore, certain contracts are combined or segmented for revenue recognition in accordance with ASC 605-35.
	For the fiscal year ended March 31, 2015, cumulative catch-up adjustments resulting from changes in contract values and estimated costs that arose during the fiscal year decreased operating income, net income and earnings per share by approximately $(156,048), $(106,639) and $(2.09), respectively. The cumulative catch-up adjustments to operating income for the fiscal year ended March 31, 2015 included gross favorable adjustments of approximately $4,653 and gross unfavorable adjustments of approximately $(160,701), which includes a provision for forward losses of $151,992, as discussed below in greater detail. For the fiscal year ended March 31, 2014, cumulative catch-up adjustments resulting from changes in estimates decreased operating income, net income and earnings per share by approximately $(53,166), $(35,121) and $(0.67), respectively. The cumulative catch-up adjustments to operating income for the fiscal year ended March 31, 2014 included gross favorable adjustments of approximately $14,341 and gross unfavorable adjustments of approximately $(67,507). For the fiscal year ended March 31, 2013, cumulative catch-up adjustments resulting from changes in estimates decreased operating income, net income and earnings per share by approximately $(14,560) $(9,350) and $(0.18), respectively. The cumulative catch-up adjustments to operating income for the fiscal year ended March 31, 2013 included gross favorable adjustments of approximately $15,913 and gross unfavorable adjustments of approximately $(30,473).
	Amounts representing contract change orders or claims are only included in revenue when such change orders or claims have been settled with the customer and to the extent that units have been delivered. Additionally, some contracts may contain provisions for revenue sharing, price re-determination, requests for equitable adjustments, change orders or cost and/or performance incentives. Such amounts or incentives are included in contract value when the amounts can be reliably estimated and their realization is reasonably assured.
	Although fixed-price contracts, which extend several years into the future, generally permit the Company to keep unexpected profits if costs are less than projected, the Company also bears the risk that increased or unexpected costs may reduce profit or cause the Company to sustain losses on the contract. In a fixed-price contract, the Company must fully absorb cost overruns, notwithstanding the difficulty of estimating all of the costs the Company will incur in performing these contracts and in projecting the ultimate level of revenue that may otherwise be achieved.
	During the third quarter of the fiscal year ended March 31, 2015, the Company recognized a provision for forward losses of $151,992 associated with the Company's long-term contract on the 747-8 program. These forward losses are largely due to changes in future estimated production rates, labor and overhead costs, pension income and expedited delivery charges.
	•	In December 2014, our customer, The Boeing Company (“Boeing”), announced a future production rate reduction for the 747-8 program from 1.5 shipsets per month to 1.3 shipsets per month. This production rate cut will result in additional future disruption and overhead cost absorption across our related production facilities.
	•	While the Company has experienced improvements in labor performance metrics on our work associated with the 747-8 program in recent quarters, the Company has not recovered to the levels previously experienced or as quickly as expected, and no longer believes that the Company can recover to the level required to avoid future losses. The Company's increased labor assumptions will also result in increased overhead cost absorption to the 747-8 program.
	•	In October 2014, the Society of Actuaries released updated mortality tables to reflect recent improvements in longevity. The mortality tables are a key assumption in the valuation of our defined benefit obligations and related net period pension benefit income. These new mortality tables will lower estimated future pension benefit income amounts, thereby negatively impacting our future cost estimates associated with the 747-8 program.
	•	Although the Company has made improvements on the quality and timeliness of deliveries as compared to the prior year, the Company continues to incur charges related to expedited delivery and have included estimates for additional costs in the future.
	While the Company has recently recognized a provision for forward losses, there is still risk similar in nature to what the Company has experienced on the 747-8 program. In particular, the Company's ability to manage risks related to supplier performance, execution of cost reduction strategies, hiring and retaining skilled production and management personnel, quality and manufacturing execution, program schedule delays and many other risks, will determine the ultimate performance of these programs.
	The Aftermarket Services Group provides repair and overhaul services, certain of which services are provided under long-term power-by-the-hour contracts, comprising approximately 7% of the segment's net sales. The Company applies the proportional performance method to recognize revenue under these contracts. Revenue is recognized over the contract period as units are delivered based on the relative value in proportion to the total estimated contract consideration. In estimating the total contract consideration, management evaluates the projected utilization of its customer's fleet over the term of the contract, in connection with the related estimated repair and overhaul servicing requirements to the fleet based on such utilization. Changes in utilization of the fleet by customers, among other factors, may have an impact on these estimates and require adjustments to estimates of revenue to be realized.
	Shipping and Handling Costs
	The cost of shipping and handling products is included in cost of products sold.
	Research and Development Expense
	Research and development expense (which includes certain amounts subject to reimbursement from customers) was approximately $81,205, $61,657 and $61,270 for the fiscal years ended March 31, 2015, 2014 and 2013, respectively.
	Retirement Benefits
	Defined benefit pension plans are recognized in the consolidated financial statements on an actuarial basis. A significant element in determining the Company's pension income (expense) is the expected long-term rate of return on plan assets. This expected return is an assumption as to the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the projected pension benefit obligation. The Company applies this assumed long-term rate of return to a calculated value of plan assets, which recognizes changes in the fair value of plan assets in a systematic manner over five years. This produces the expected return on plan assets that is included in pension income (expense). The difference between this expected return and the actual return on plan assets is deferred. The net deferral of past asset gains (losses) affects the calculated value of plan assets and, ultimately, future pension income (expense).
	The Company periodically experiences events or makes changes to its benefit plans that result in curtailment or special charges. Curtailments are recognized when events occur that significantly reduce the expected years of future service of present employees or eliminates the benefits for a significant number of employees for some or all of their future service.
	Curtailment losses are recognized when it is probable the curtailment will occur and the effects are reasonably estimable. Curtailment gains are recognized when the related employees are terminated or a plan amendment is adopted, whichever is applicable.
	As required under ASC 715, Compensation - Retirement Benefits, the Company remeasures plan assets and obligations during an interim period whenever a significant event occurs that results in a material change in the net periodic pension cost. The determination of significance is based on judgment and consideration of events and circumstances impacting the pension costs.
At March 31 of each year, the Company determines the fair value of its pension plan assets as well as the discount rate to be used to calculate the present value of plan liabilities. The discount rate is an estimate of the interest rate at which the pension benefits could be effectively settled. In estimating the discount rate, the Company looks to rates of return on high-quality, fixed-income investments currently available and expected to be available during the period to maturity of the pension benefits. The Company uses a portfolio of fixed-income securities, which receive at least the second-highest rating given by a recognized ratings agency.
Fair Value Measurements
Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. When determining fair value measurements for assets and liabilities required to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and also considers assumptions that market participants would use when pricing an asset or liability. The fair value hierarchy has three levels of inputs that may be used to measure fair value: Level 1—Unadjusted quoted prices in active markets for identical assets or liabilities; Level 2—Unadjusted quoted prices in active markets for similar assets or liabilities, or unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs other than quoted prices that are observable for the asset or liability; and Level 3—Unobservable inputs for the asset or liability. The Company has applied fair value measurements to its interest rate swap (see Note 10) and to its pension and postretirement plan assets (see Note 15).
Foreign Currency Translation
The determination of the functional currency for the Company's foreign subsidiaries is made based on appropriate economic factors. The functional currency of the Company's subsidiaries Triumph Aviation Services—Asia and Triumph Structures—Thailand is the U.S. dollar since that is the currency in which that entity primarily generates and expends cash. The functional currency of the Company's remaining subsidiaries is the local currency, since that is the currency in which those entities primarily generate and expend cash. Assets and liabilities of these subsidiaries are translated at the rates of exchange at the balance sheet date. Income and expense items are translated at average monthly rates of exchange. The resultant translation adjustments are included in accumulated other comprehensive income (see Note 13). Gains and losses arising from foreign currency transactions of these subsidiaries are included in net income.
Income Taxes
The Company accounts for income taxes using the asset and liability method. The asset and liability method requires recognition of deferred tax assets and liabilities for expected future tax consequences of temporary differences that currently exist between tax bases and financial reporting bases of the Company's assets and liabilities. A valuation allowance is provided on deferred taxes if it is determined that it is more likely than not that the asset will not be realized. The Company recognizes penalties and interest accrued related to income tax liabilities in the provision for income taxes in its consolidated statements of income.
Significant management judgment is required to determine the amount of benefit to be recognized in relation to an uncertain tax position. The Company uses a two-step process to evaluate tax positions. The first step requires an entity to determine whether it is more likely than not (greater than 50% chance) that the tax position will be sustained. The second step requires an entity to recognize in the financial statements the benefit of a tax position that meets the more-likely-than-not recognition criterion. The amounts ultimately paid upon resolution of issues raised by taxing authorities may differ materially from the amounts accrued and may materially impact the financial statements of the Company in future periods.
Recently Issued Accounting Pronouncements
In April 2015, the Financial Accounting Standards Board ("FASB") issued ASU 2015-03, Interest—Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs ("ASU-2015-03"). ASU 2015-03 requires companies to present debt issuance costs as a direct deduction from the carrying value of that debt liability. ASU 2015-03 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is allowed for financial statements that have not been previously issued. Entities would apply the new guidance retrospectively to all prior periods (i.e., the balance sheet for each period is adjusted). The adoption of this standard is not expected to have a material impact on the Company’s financial position, results of operations or cash flows.
In January 2015, the FASB issued ASU 2015-1, Income Statement - Extraordinary and Unusual Items ("ASU 2015-1"). ASU 2015-1 eliminates from GAAP the concept of extraordinary items. The update is effective for the Company for the interim and annual periods beginning after December 15, 2015. The adoption of this standard is not expected to have a material impact on the Company’s financial position, results of operations or cash flows.
In August 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties About an Entity’s Ability to Continue as a Going Concern ("ASU 2014-15"). ASU 2014-15 provides guidance on determining when and how to disclose going-concern uncertainties in the financial statements. The new standard requires management to perform interim and annual assessments of an entity’s ability to continue as a going concern within one year of the date the financial statements are issued. An entity must provide certain disclosures if “conditions or events raise substantial doubt about the entity’s ability to continue as a going concern.” ASU 2014-15 applies to all entities and is effective for annual periods ending after December 15, 2016, and interim periods thereafter, with early adoption permitted. The adoption of this standard is not expected to have a material impact on the Company’s financial position, results of operations or cash flows.
In May 2014, the FASB issued guidance codified in Accounting Standards Codification ("ASC") 606, Revenue Recognition - Revenue from Contracts with Customers, which amends the guidance in former ASC 605, Revenue Recognition. The objective of ASC 606 is to establish a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most of the existing revenue recognition guidance. The principle of ASC 606 is that an entity will recognize revenue at the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled. ASC 606 is effective for interim and annual reporting periods beginning after December 15, 2016 and can be adopted by the Company using either a full retrospective or modified retrospective approach, with early adoption prohibited. The Company is currently evaluating ASC 606 and has not determined the impact it may have on the Company’s consolidated results of operations, financial position or cash flows nor decided on the method of adoption.
In April 2014, the FASB issued ASU 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity ("ASU 2014-08"). ASU 2014-08 provides new guidance on the accounting and reporting of discontinued operations. Under the new guidance, only disposals representing a strategic shift in operations should be presented as discontinued operations. Those strategic shifts should have a major effect on the organization’s operations and financial results. Additionally, the new guidance requires additional disclosures about discontinued operations. The update is effective for the Company for the interim and annual periods beginning after December 15, 2014. The adoption of the provisions of ASU 2014-08 is not expected to have a material impact on the Company's consolidated financial statements.
Stock-Based Compensation
The Company recognizes compensation expense for share-based awards based on the fair value of those awards at the date of grant. Stock-based compensation expense for fiscal years ended March 31, 2015, 2014 and 2013 was $1,272, $4,653 and $6,367, respectively. The benefits of tax deductions in excess of recognized compensation expense were $39 and $4,628 for fiscal years ended March 31, 2014 and 2013, respectively. The Company has classified share-based compensation within selling, general and administrative expenses to correspond with the same line item as the majority of the cash compensation paid to employees. Upon the exercise of stock options or vesting of restricted stock, the Company first transfers treasury stock, then will issue new shares. (see Note 16 for further details).
Supplemental Cash Flow Information
For the fiscal year ended March 31, 2015, the Company received $22,241 for income tax refunds, net of payments. For the fiscal years ended March 31, 2014 and 2013, Company paid $4,157 and $3,109, respectively, for income taxes, net of income tax refunds received. The Company made interest payments of $82,425, $81,100 and $62,229 for fiscal years ended March 31, 2015, 2014 and 2013.
During the fiscal years ended March 31, 2015, 2014 and 2013, the Company financed $52, $36 and $66 of property and equipment additions through capital leases, respectively. During the fiscal years ended March 31, 2014 and 2013, the Company issued 2,290,755 and 395,269 shares, respectively, in connection with certain redemptions of convertible senior subordinated notes (see Note 10).
Warranty Reserves
A reserve has been established to provide for the estimated future cost of warranties on our delivered products. The Company periodically reviews the reserves and adjustments are made accordingly. A provision for warranty on products delivered is made on the basis of historical experience and identified warranty issues. Warranties cover such factors as non-conformance to specifications and defects in material and workmanship. The majority of the Company's agreements include a three-year warranty, although certain programs have warranties up to 20 years. Warranty reserves are included in accrued expenses and other noncurrent liabilities. The warranty reserves for the fiscal years ended March 31, 2015 and 2014 were $78,972 and $25,651, respectively. This increase is primarily due to acquisitions (see Note 3).

DISCONTINUED_OPERATIONS_AND_AS

DISCONTINUED OPERATIONS AND ASSETS HELD FOR SALE	12 Months Ended
	Mar. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
DISCONTINUED OPERATIONS AND ASSETS HELD FOR SALE	DISCONTINUED OPERATIONS AND ASSETS HELD FOR SALE
	Sale of Triumph Aerospace Systems - Wichita
	In January 2014, the Company sold all of the shares of Triumph Aerospace Systems-Wichita, Inc. ("TAS-Wichita") for total cash proceeds of $23,000. As a result of the sale of TAS-Wichita, the Company recognized no gain or loss. The operating results of TAS-Wichita were included in the Aerostructures Group through the date of disposal.
	Sale of Triumph Instruments - Burbank and Triumph Instruments - Ft. Lauderdale
	In April 2013, the Company sold the assets and liabilities of Triumph Instruments - Burbank and Triumph Instruments - Ft. Lauderdale ("Triumph Instruments") for total proceeds of $11,200 including cash received at closing of $9,676, a note of $1,500, and the remaining amount held in escrow and received in the second quarter of fiscal 2014, resulting in a loss of $1,462 recognized during the year ended March 31, 2013. The operating results are included in the Aftermarket Services Group through the date of disposal.
	The Company expects to have significant continuing involvement in the business and markets of the disposed entities, as defined by ASC 250-20, Discontinued Operations; and therefore as a result, the disposal group does not meet the criteria to be classified as discontinued operations.
	To measure the amount of impairment related to Triumph Instruments, the Company compared the fair value of assets and liabilities at the evaluation date to the carrying amount at the end of the month prior to the evaluation date. The sale of the Triumph Instruments assets and liabilities are categorized as Level 2 within the fair value hierarchy. The key assumption included the negotiated sales price of the assets and the assumptions of the liabilities (see Note 2 for definition of levels).

INVENTORIES

INVENTORIES	12 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES
	Inventories are stated at the lower of cost (average-cost or specific-identification methods) or market. The components of inventories are as follows:
		March 31,
		2015			2014
	Raw materials	$	79,786		$	106,552
	Work-in-process	1,291,377			1,102,626
	Finished goods	91,639			67,608
	Less: unliquidated progress payments	(189,923		)	(165,019		)
	Total inventories	$	1,272,879		$	1,111,767
	According to the provisions of U.S. Government contracts, the customer has title to, or a security interest in, substantially all inventories related to such contracts. Included above is total net inventory on government contracts of $70,121 and $64,418, respectively, at March 31, 2015 and 2014.
	Work-in-process inventory includes capitalized pre-production costs. Capitalized pre-production costs include nonrecurring engineering, planning and design, including applicable overhead, incurred before production is manufactured on a regular basis. Significant customer-directed work changes can also cause pre-production costs to be incurred. These costs are typically recovered over a contractually determined number of ship set deliveries and the Company believes these amounts will be fully recovered. The balance of capitalized pre-production costs related to the Company's contracts with Bombardier for the Global 7000/8000 program ("Bombardier") and Embraer for the second generation E-Jet ("Embraer") are as follows:
		March 31,
		2015			2014
	Bombardier	$	238,871		$	111,906
	Embraer	68,112			19,452
	Total	$	306,983		$	131,358
	The Company is still in the pre-production stages for the Bombardier and Embraer programs, as these aircrafts are not scheduled to enter service until 2017, or later. Transition of these programs from development to recurring production levels is dependent upon the success of the programs at achieving flight testing and certification, as well as the ability of the Bombardier and Embraer programs to generate acceptable levels of aircraft sales. The failure to achieve these milestones and level of sales or significant cost overruns may result in an impairment of the capitalized pre-production costs.

PROPERTY_AND_EQUIPMENT

PROPERTY AND EQUIPMENT	12 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment Disclosure [Text Block]	PROPERTY AND EQUIPMENT
	Net property and equipment at March 31, 2015 and 2014 is:
		March 31,
		2015		2014
	Land	$	72,893	$	74,835
	Construction in process	53,475		68,904
	Buildings and improvements	374,763		353,096
	Furniture, fixtures and computer equipment	146,834		135,986
	Machinery and equipment	945,317		841,441
		1,593,282		1,474,262
	Less accumulated depreciation	644,380		542,832
		$	948,902	$	931,430
	Depreciation expense for the fiscal years ended March 31, 2015, 2014 and 2013 was $108,347, $117,553 and $93,848, respectively, which includes depreciation of assets under capital lease. Included in furniture, fixtures and computer equipment above is $84,098 and $80,361, respectively, of capitalized software at March 31, 2015 and 2014, which were offset by accumulated depreciation of $55,304 and $43,793, respectively.

GOODWILL_AND_OTHER_INTANGIBLE_

GOODWILL AND OTHER INTANGIBLE ASSETS	12 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	GOODWILL AND OTHER INTANGIBLE ASSETS
	The following is a summary of the changes in the carrying value of goodwill by reportable segment, for the fiscal years ended March 31, 2015 and 2014:
		Aerostructures				Aerospace				Aftermarket				Total
						Systems				Services
	Balance, March 31, 2014	$	1,339,993			$	395,912			$	55,986			$	1,791,891
	Goodwill recognized in connection with acquisitions	74,837				161,160				25,159				261,156
	Effect of exchange rate changes	870				(23,431		)		108				(22,453		)
	Balance, March 31, 2015	$	1,415,700			$	533,641			$	81,253			$	2,030,594
		Aerostructures				Aerospace				Aftermarket				Total
						Systems				Services
	Balance, March 31, 2013	$	1,316,450			$	349,284			$	55,986			$	1,721,720
	Goodwill recognized in connection with acquisitions	33,798				46,468				—				80,266
	Goodwill associated with disposition	(10,123		)		—				—				(10,123		)
	Purchase accounting adjustments	33				—				—				33
	Effect of exchange rate changes	(165		)		160				—				(5		)
	Balance, March 31, 2014	$	1,339,993			$	395,912			$	55,986			$	1,791,891
	The fiscal year ended March 31, 2014, purchase accounting adjustments of $33 relates to an earnout on an acquisition accounted for prior to the adoption of ASC 805 for which the earnings target was achieved during the period.
	Intangible Assets
	The components of intangible assets, net are as follows:
		March 31, 2015
		Weighted-		Gross Carrying				Accumulated				Net
		Average Life (in Years)		Amount				Amortization
	Customer relationships	16.5		$	689,179			$	(180,765	)		$	508,414
	Product rights, technology and licenses	11.8		56,419				(33,208		)		23,211
	Noncompete agreements and other	15.8		2,929				(565		)		2,364
	Tradenames	Indefinite-lived		438,400				—				438,400
	Total intangibles, net			$	1,186,927			$	(214,538	)		$	972,389
		March 31, 2014
		Weighted-		Gross Carrying				Accumulated				Net
		Average Life (in Years)		Amount				Amortization
	Customer relationships	16.7		$	650,199			$	(136,970	)		$	513,229
	Product rights, technology and licenses	11.7		52,405				(28,437		)		23,968
	Noncompete agreements and other	13.6		3,679				(1,105		)		2,574
	Tradenames	Indefinite-lived		438,400				—				438,400
	Total intangibles, net			$	1,144,683			$	(166,512	)		$	978,171
	Amortization expense for the fiscal years ended March 31, 2015, 2014 and 2013 was $49,976, $46,724 and $35,658, respectively. Amortization expense for the five fiscal years succeeding March 31, 2015 by year is expected to be as follows: 2016: $49,839; 2017: $43,624; 2018: $41,996; 2019: $40,230; 2020: $38,394 and thereafter: $319,906.

ACCRUED_EXPENSES

ACCRUED EXPENSES	12 Months Ended
	Mar. 31, 2015
Accrued Liabilities [Abstract]
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	ACCRUED EXPENSES
	Accrued expenses are composed of the following items:
		March 31,
		2015		2014
	Accrued pension	$	3,940	$	3,960
	Deferred revenue, advances and progress billings	32,210		20,428
	Accrued other postretirement benefits	20,116		26,038
	Accrued compensation and benefits	115,294		103,962
	Accrued interest	16,624		17,966
	Warranty reserve	47,203		13,628
	Accrued workers' compensation	16,500		15,010
	Accrued income tax	2,516		796
	Loss contract reserve	99,559		2,236
	Contingent consideration	972		—
	Legal contingencies	—		38,000
	All other	72,806		31,266
	Total accrued expenses	$	427,740	$	273,290

LEASES

LEASES	12 Months Ended
	Mar. 31, 2015
Leases [Abstract]
Leases of Lessee Disclosure [Text Block]	LEASES
	At March 31, 2015, future minimum payments under noncancelable operating leases with initial or remaining terms of more than one year were as follows: 2016—$25,975; 2017—$22,839; 2018—$20,624; 2019—$17,907; 2020—$14,294 and thereafter—$50,914 through 2027. In the normal course of business, operating leases are generally renewed or replaced by other leases.
	Total rental expense was $34,762, $41,508 and $38,349 for the fiscal years ended March 31, 2015, 2014 and 2013, respectively.

LONGTERM_DEBT

LONG-TERM DEBT	12 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT
	Long-term debt consists of the following:
		March 31,
		2015			2014
	Revolving credit facility	$	148,255		$	194,406
	Term loan	356,250			375,000
	Receivable securitization facility	100,000			162,400
	Equipment leasing facility	91,913			74,342
	Senior notes due 2018	—			348,423
	Senior notes due 2021	375,000			375,000
	Senior notes due 2022	300,000			—
	Convertible senior subordinated notes	—			12,834
	Other debt	7,978			7,978
		1,379,396			1,550,383
	Less: current portion	42,255			49,575
		$	1,337,141		$	1,500,808
	Revolving Credit Facility
	In May 2014, the Company amended and restated its existing credit agreement (the “Credit Facility”) with its lenders to (i) increase the maximum amount allowed for the receivable securitization facility (the "Securitization Facility") and (ii) amend certain other terms and covenants.
	In November 2013, the Company amended and restated its Credit Facility with its lenders to (i) provide for a $375,000 term loan with a maturity date of May 14, 2019 (the "2013 Term Loan"), (ii) maintain a Revolving Line of Credit under the Credit Facility of $1,000,000, with a $250,000 accordion feature, (iii) extend the maturity date to November 19, 2018, and (iv) amend certain other terms and covenants. In connection with the amendment to the Credit Facility, the Company incurred approximately $2,795 of financing costs. These costs, along with the $6,507 of unamortized financing costs prior to the amendment, are being amortized over the remaining term of the Credit Facility.
	The Company will repay the outstanding principal amount of the 2013 Term Loan in quarterly installments, on the first business day of each January, April, July and October, commencing April 2014.
	The obligation under the Credit Facility and related documents are secured by liens on substantially all assets of the Company and its domestic subsidiaries pursuant to an Amended and Restated Guarantee and Collateral Agreement, dated as of November 19, 2013, among the administrative agent, the Company and the subsidiaries of the Company party thereto.
	Pursuant to the Credit Facility, the Company can borrow, repay and re-borrow revolving credit loans, and cause to be issued letters of credit, in an aggregate principal amount not to exceed $1,000,000 outstanding at any time. The Credit Facility bears interest at either: (i) LIBOR plus between 1.38% and 2.50%; (ii) the prime rate; or (iii) an overnight rate at the option of the Company. The applicable interest rate is based upon the Company’s ratio of total indebtedness to earnings before interest, taxes, depreciation and amortization. In addition, the Company is required to pay a commitment fee of between 0.25% and 0.45% on the unused portion of the Credit Facility. The Company’s obligations under the Credit Facility are guaranteed by the Company’s domestic subsidiaries.
	At March 31, 2015, there were $148,255 in outstanding borrowings and $35,384 in letters of credit under the Credit Facility primarily to support insurance policies. At March 31, 2014, there were $194,406 in borrowings and $36,445 in letters of credit outstanding. The level of unused borrowing capacity under the Credit Facility varies from time to time depending in part upon the Company's compliance with financial and other covenants set forth in the related agreement. The Credit Facility contains certain affirmative and negative covenants including limitations on specified levels of indebtedness to earnings before interest, taxes, depreciation and amortization, and interest coverage requirements, and includes limitations on, among other things, liens, mergers, consolidations, sales of assets, payment of dividends and incurrence of debt. If an event of default were to occur under the Credit Facility, the lenders would be entitled to declare all amounts borrowed under it immediately due and payable. The occurrence of an event of default under the Credit Facility could also cause the acceleration of obligations under certain other agreements. The Company is in compliance with all such covenants as of March 31, 2015. As of March 31, 2015, the Company had borrowing capacity under the Credit Facility of $816,361 after reductions for borrowings and letters of credit outstanding under the Credit Facility.
	In connection with the Company amending and restating the Credit Facility to add the 2013 Term Loan, the Company also entered into an interest rate swap agreement through November 2018 to reduce its exposure to interest on the variable rate portion of its long-term debt. On the date of inception, the Company designated the interest rate swap as a cash flow hedge in accordance with FASB guidance on accounting for derivatives and hedges and linked the interest rate swap to the 2013 Term Loan. The Company formally documented the hedging relationship between 2013 Term Loan and the interest rate swap, as well as its risk-management objective and strategy for undertaking the hedge, the nature of the risk being hedged, how the hedging instrument's effectiveness will be assessed and a description of the method of measuring the ineffectiveness. The Company also formally assesses, both at the hedge's inception and on a quarterly basis, whether the derivative item is highly effective offsetting changes in cash flows.
	As of March 31, 2015 and 2014, the interest rate swap agreement had a notional amount of $356,250 and $375,000, respectively, and a fair value of $(2,743) and $2,426, respectively, which is recorded in other comprehensive income net of applicable taxes (Level 2). The interest rate swap settles on a monthly basis when interest payments are made. These settlements occur through the maturity date.
	Receivables Securitization Program
	In November 2014, the Company amended its receivable securitization facility (the "Securitization Facility"), increasing the purchase limit from $175,000 to $225,000 and extending the term through November 2017. In connection with the Securitization Facility, the Company sells on a revolving basis certain eligible accounts receivable to Triumph Receivables, LLC, a wholly owned special-purpose entity, which in turn sells a percentage ownership interest in the receivables to commercial paper conduits sponsored by financial institutions. The Company is the servicer of the accounts receivable under the Securitization Facility. As of March 31, 2015, the maximum amount available under the Securitization Facility was $225,000. Interest rates are based on prevailing market rates for short-term commercial paper plus a program fee and a commitment fee. The program fee is 0.40% on the amount outstanding under the Securitization Facility. Additionally, the commitment fee is 0.40% on 100% of the maximum amount available under the Securitization Facility. At March 31, 2015, $100,000 was outstanding under the Securitization Facility. In connection with amending the Securitization Facility, the Company incurred approximately $252 of financing costs. These costs, along with the $341 of unamortized financing costs prior to the amendment, are being amortized over the life of the Securitization Facility. The Company securitizes its accounts receivable, which are generally non-interest bearing, in transactions that are accounted for as borrowings pursuant to the Transfers and Servicing topic of the ASC.
	The agreement governing the Securitization Facility contains restrictions and covenants which include limitations on the making of certain restricted payments, creation of certain liens, and certain corporate acts such as mergers, consolidations and the sale of substantially all assets. The Company was in compliance with all such covenants as of March 31, 2015.
	Equipment Leasing Facility and Other Capital Leases
	During March 2009, the Company entered into a seven-year Master Lease Agreement (the "Leasing Facility") creating a capital lease of certain existing property and equipment. The net proceeds from the Leasing Facility were used to repay a portion of the outstanding indebtedness under the Company's 2009 Credit Agreement. The Leasing Facility bears interest at a weighted-average fixed rate of 6.2% per annum.
	During the fiscal years ended March 31, 2015, 2014 and 2013, the Company entered into new capital leases in the amounts of $52, $36 and $66, respectively, to finance a portion of the Company's capital additions for the respective years. During the fiscal years ended March 31, 2015, 2014 and 2013, the Company obtained financing for existing fixed assets in the amount of $37,608, $30,503 and $14,435, respectively.
	Senior Notes due 2021
	On February 26, 2013, the Company issued $375,000 principal amount of 4.875% Senior Notes due 2021 (the "2021 Notes"). The 2021 Notes were sold at 100% of principal amount and have an effective interest yield of 4.875%. Interest on the Notes accrues at the rate of 4.875% per annum and is payable semiannually in cash in arrears on April 1 and October 1 of each year, commencing on October 1, 2013. In connection with the issuance of the 2021 Notes, the Company incurred approximately $6,327 of costs, which were deferred and are being amortized on the effective interest method over the term of the 2021 Notes.
	The 2021 Notes are the Company's senior unsecured obligations and rank equally in right of payment with all of its other existing and future senior unsecured indebtedness and senior in right of payment to all of its existing and future subordinated indebtedness. The 2021 Notes are guaranteed on a full, joint and several basis by each of the Guarantor Subsidiaries.
	The Company may redeem some or all of the 2021 Notes prior to April 1, 2017 by paying a "make-whole" premium. The Company may redeem some or all of the 2021 Notes on or after April 1, 2017 at specified redemption prices. In addition, prior to April 1, 2016, the Company may redeem up to 35% of the 2021 Notes with the net proceeds of certain equity offerings at a redemption price equal to 104.875% of the aggregate principal amount plus accrued and unpaid interest, if any, subject to certain limitations set forth in the indenture governing the 2021 Notes (the "2021 Indenture").
	The Company is obligated to offer to repurchase the 2021 Notes at a price of (i) 101% of their principal amount plus accrued and unpaid interest, if any, as a result of certain change of control events and (ii) 100% of their principal amount plus accrued and unpaid interest, if any, in the event of certain asset sales. These restrictions and prohibitions are subject to certain qualifications and exceptions.
	The 2021 Indenture contains covenants that, among other things, limit the Company's ability and the ability of any of the Guarantor Subsidiaries to (i) grant liens on its assets, (ii) make dividend payments, other distributions or other restricted payments, (iii) incur restrictions on the ability of the Guarantor Subsidiaries to pay dividends or make other payments, (iv) enter into sale and leaseback transactions, (v) merge, consolidate, transfer or dispose of substantially all of their assets, (vi) incur additional indebtedness, (vii) use the proceeds from sales of assets, including capital stock of restricted subsidiaries, and (viii) enter into transactions with affiliates.
	Senior Notes Due 2022
	On June 3, 2014, the Company issued $300,000 principal amount of 5.250% Senior Notes due 2022 (the "2022 Notes"). The 2022 Notes were sold at 100% of principal amount and have an effective interest yield of 5.250%. Interest on the 2022 Notes accrues at the rate of 5.250% per annum and is payable semiannually in cash in arrears on June 1 and December 1 of each year, commencing on December 1, 2014. In connection with the issuance of the 2022 Notes, the Company incurred approximately $4,990 of costs, which were deferred and are being amortized on the effective interest method over the term of the 2022 Notes.
	The 2022 Notes are the Company's senior unsecured obligations and rank equally in right of payment with all of its other existing and future senior unsecured indebtedness and senior in right of payment to all of its existing and future subordinated indebtedness. The 2022 Notes are guaranteed on a full, joint and several basis by each of the Guarantor Subsidiaries.
	The Company may redeem some or all of the 2022 Notes prior to June 1, 2017 by paying a "make-whole" premium. The Company may redeem some or all of the 2022 Notes on or after June 1, 2017 at specified redemption prices. In addition, prior to June 1, 2017, the Company may redeem up to 35% of the 2022 Notes with the net proceeds of certain equity offerings at a redemption price equal to 105.250% of the aggregate principal amount plus accrued and unpaid interest, if any, subject to certain limitations set forth in the indenture governing the 2022 Notes (the "2022 Indenture").
	The Company is obligated to offer to repurchase the 2022 Notes at a price of (i) 101% of their principal amount plus accrued and unpaid interest, if any, as a result of certain change-of-control events and (ii) 100% of their principal amount plus accrued and unpaid interest, if any, in the event of certain asset sales. These restrictions and prohibitions are subject to certain qualifications and exceptions.
	The 2022 Indenture contains covenants that, among other things, limit the Company's ability and the ability of any of the Guarantor Subsidiaries to (i) grant liens on its assets, (ii) make dividend payments, other distributions or other restricted payments, (iii) incur restrictions on the ability of the Guarantor Subsidiaries to pay dividends or make other payments, (iv) enter into sale and leaseback transactions, (v) merge, consolidate, transfer or dispose of substantially all of their assets, (vi) incur additional indebtedness, (vii) use the proceeds from sales of assets, including capital stock of restricted subsidiaries, and (viii) enter into transactions with affiliates.
	Senior Subordinated Notes Due 2017
	On November 16, 2009, the Company issued $175,000 principal amount of 8.00% Senior Subordinated Notes due 2017 (the "2017 Notes"). The 2017 Notes were sold at 98.56% of principal amount and have an effective interest yield of 8.25%. Interest on the 2017 Notes was payable semiannually in cash in arrears on May 15 and November 15 of each year. In connection with the issuance of the 2017 Notes, the Company incurred approximately $4,390 of costs, which were deferred and amortized on the effective interest method over the term of the 2017 Notes.
	On November 15, 2013, the Company completed the redemption of the 2017 Notes. The principal amount of $175,000 was redeemed at a price of 104% plus accrued and unpaid interest. As a result of the redemption, the Company recognized a pre-tax loss on redemption of $11,069, consisting of early termination premium, unamortized discount and deferred financing fees and is presented on the accompanying Consolidated Statements of Income as a component of "Interest expense and other."
	Senior Notes due 2018
	On June 16, 2010, in connection with the acquisition of Vought, the Company issued $350,000 principal amount of 8.63% Senior Notes due 2018 (the "2018 Notes"). The 2018 Notes were sold at 99.27% of principal amount and have an effective interest yield of 8.75%. Interest on the 2018 Notes accrued at the rate of 8.63% per annum and was payable semiannually in cash in arrears on January 15 and July 15 of each year, commencing on January 15, 2011. In connection with the issuance of the 2018 Notes, the Company incurred approximately $7,307 of costs, which were deferred and amortized on the effective interest method over the term of the 2018 Notes.
	On June 23, 2014, the Company completed the redemption of the 2018 Notes. The principal amount of $350,000 was redeemed at a price of 104.79% plus accrued and unpaid interest. As a result of the redemption, the Company recognized a pre-tax loss on redemption of $22,615, consisting of early termination premium, write-off of unamortized discount and deferred financing fees and was recorded on the Condensed Consolidated Statements of Income as a component of "Interest expense and other" for the fiscal year ended March 31, 2015.
	Convertible Senior Subordinated Notes
	On September 18, 2006, the Company issued $201,250 in convertible senior subordinated notes (the "Convertible Notes"). The Convertible Notes are direct, unsecured, senior subordinated obligations of the Company, and rank (i) junior in right of payment to all of the Company's existing and future senior indebtedness, (ii) equal in right of payment with any other future senior subordinated indebtedness, and (iii) senior in right of payment to all subordinated indebtedness.
	The Company received net proceeds from the sale of the Convertible Notes of approximately $194,998 after deducting debt issuance costs of approximately $6,252. The issuance costs were allocated to the respective liability and equity components, with the liability component recorded as other assets and the equity component recorded as a reduction of equity in the accompanying Consolidated Balance Sheets. Debt issuance costs were fully amortized as of September 30, 2011.
	The Convertible Notes accrued interest at a fixed rate of 2.63% per annum, payable in cash semiannually in arrears on each April 1 and October 1 beginning April 1, 2007. During the period commencing on October 6, 2011 and ending on, but excluding, April 1, 2012 and each semiannual period from October 1 to March 31 or from April 1 to September 30 thereafter, the Company paid contingent interest during the applicable interest period if the average trading price of a note for the five consecutive trading days ending on the third trading day immediately preceding the first day of the relevant semiannual period equals or exceeds 120% of the principal amount of the Convertible Notes. The contingent interest payable per note in respect of any semiannual period equaled 0.25% per annum calculated on the average trading price of a note for the relevant five trading day period.
	Prior to fiscal 2011, the Company paid $19,414 to purchase $22,200 in principal amount of the Convertible Notes.
	The Convertible Notes would have matured on October 1, 2026 unless earlier redeemed, repurchased or converted. The Company was able to redeem the Convertible Notes for cash, either in whole or in part, anytime on or after October 6, 2011 at a redemption price equal to 100% of the principal amount of the Convertible Notes to be redeemed plus accrued and unpaid interest, including contingent interest and additional amounts, if any, up to but not including the date of redemption. In addition, holders of the Convertible Notes had the right to require the Company to repurchase for cash all or a portion of their Convertible Notes on October 1, 2016 and 2021, at a repurchase price equal to 100% of the principal amount of the Convertible Notes to be repurchased plus accrued and unpaid interest, including contingent interest and additional amounts, if any, up to, but not including, the date of repurchase. The Convertible Notes were convertible into the Company's common stock at a rate equal to 36.8679 shares per $1 principal amount of the Convertible Notes (equal to an initial conversion price of approximately $27.12 per share), subject to adjustment as described in the Indenture. Upon conversion, the Company delivered to the holder surrendering the Convertible Notes for conversion, for each $1 principal amount of Convertible Notes, an amount consisting of cash equal to the lesser of $1 and the Company's total conversion obligation and, to the extent that the Company's total conversion obligation exceeded $1, at the Company's election, cash or shares of the Company's common stock in respect of the remainder.
	On May 22, 2014, the Company announced the redemption of the Convertible Notes. The redemption price for the Convertible Notes was equal to the sum of 100% of the principal amount of the Convertible Notes outstanding, plus accrued and unpaid interest on the Convertible Notes up to, but not including, the redemption date of June 23, 2014. The Convertible Notes were able to be converted at the option of the holder.
	The Convertible Notes were eligible for conversion upon meeting certain conditions as provided in the indenture governing the Convertible Notes. For the periods from January 1, 2011 through June 23, 2014, the Convertible Notes were eligible for conversion. During the fiscal year ended March 31, 2015, the Company settled the conversion of $12,834 in principal value of the Convertible Notes, with the principal and and the conversion benefit settled in cash. During the fiscal years ended March 31, 2014 and 2013, the Company settled the conversion of $96,535 and $19,286, respectively, in principal value of the Convertible Notes, as requested by the respective holders, with the principal settled in cash and the conversion benefit settled through the issuance of 2,290,755 and 395,269 shares, respectively.
	To be included in the calculation of diluted earnings per share, the average price of the Company's common stock for the fiscal year must exceed the conversion price per share of $27.12. The average price of the Company's common stock for the fiscal years ended March 31, 2015, 2014 and 2013 was $65.11, $73.94 and $64.30, respectively. Therefore, 40,177, 811,083 and 2,400,439 additional shares, respectively, were included in the diluted earnings per share calculation for the fiscal years ended March 31, 2015, 2014 and 2013, respectively.
	Financial Instruments Not Recorded at Fair Value
	Carrying amounts and the related estimated fair values of the Company's long-term debt not recorded at fair value in the financial statements are as follows:
	March 31, 2015						March 31, 2014
	Carrying			Fair			Carrying		Fair
	Value			Value			Value		Value
	$	1,379,396		$	1,358,306		$	1,550,383	$	1,580,447
The fair value of the long-term debt was calculated based on either interest rates available for debt with terms and maturities similar to the Company's existing debt arrangements or broker quotes on our existing debt (Level 2 inputs).
Interest paid on indebtedness during the fiscal years ended March 31, 2015, 2014 and 2013 amounted to $82,425, $81,100 and $62,229, respectively. Interest capitalized during the fiscal years ended March 31, 2015, 2014 and 2013 was $284, $4,246 and $1,114, respectively.
As of March 31, 2015, the maturities of long-term debt are as follows: 2016—$42,255; 2017—$36,805; 2018—$294,284; 2019—$299,354; 2020—$11,008; and thereafter—$695,691 through 2021.

OTHER_NONCURRENT_LIABILITIES

OTHER NONCURRENT LIABILITIES	12 Months Ended
	Mar. 31, 2015
Other Liabilities, Noncurrent [Abstract]
Other Liabilities Disclosure [Text Block]	OTHER NONCURRENT LIABILITIES
	Other noncurrent liabilities are composed of the following items:
		March 31,
		2015		2014
	Acquired contract liabilities, net	$	644,950	$	141,505
	Deferred grant income	20,354		21,905
	Accrued workers' compensation	15,657		18,077
	Environmental contingencies	8,638		9,959
	Accrued warranties	31,769		12,022
	Income tax reserves	3,690		3,196
	Contingent consideration	—		1,740
	Legal contingencies	9,500		9,500
	All other	19,495		16,852
	Total other noncurrent liabilities	$	754,053	$	234,756

INCOME_TAXES

INCOME TAXES	12 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES
	The components of pretax income are as follows:
		Year ended March 31,
		2015				2014				2013
	Foreign	$	(429	)		$	3,482			$	11,829
	Domestic	349,723				308,751				451,228
		$	349,294			$	312,233			$	463,057
	The components of income tax expense are as follows:
		Year ended March 31,
		2015				2014				2013
	Current:
	Federal	$	391			$	672			$	(24,403	)
	State	178				1,346				1,830
	Foreign	4,751				1,090				1,516
		5,320				3,108				(21,057		)
	Deferred:
	Federal	114,260				100,191				176,187
	State	(1,857		)		3,102				10,789
	Foreign	(7,126		)		(424		)		(209		)
		105,277				102,869				186,767
		$	110,597			$	105,977			$	165,710
	A reconciliation of the statutory federal income tax rate to the effective tax rate is as follows:
		Year ended March 31,
		2015			2014			2013
	Statutory federal income tax rate	35	%		35	%		35	%
	State and local income taxes, net of federal tax benefit	0.5			0.9			1.8
	Miscellaneous permanent items and nondeductible accruals	(0.7	)		0.5			(0.3	)
	Research and development tax credit	(1.9	)		(1.8	)		(1.1	)
	Foreign tax credits	(0.2	)		—			—
	Other	(1.0	)		(0.7	)		0.4
	Effective income tax rate	31.7	%		33.9	%		35.8	%
	The components of deferred tax assets and liabilities are as follows:
		March 31,
		2015				2014
	Deferred tax assets:
	Net operating loss and other credit carryforwards	$	186,172			$	196,599
	Inventory	2,987				6,687
	Accruals and reserves	39,041				34,339
	Pension and other postretirement benefits	186,806				186,941
	Acquired contract liabilities, net	146,515				48,500
	Other	—				737
		561,521				473,803
	Valuation allowance	(1,472		)		(1,424		)
	Net deferred tax assets	560,049				472,379
	Deferred tax liabilities:
	Long-term contract accounting	311,521				317,377
	Property and equipment	144,681				141,854
	Goodwill and other intangible assets	342,794				333,889
	Prepaid expenses and other	4,228				7,139
		803,224				800,259
	Net deferred tax liabilities	$	243,175			$	327,880
	As of March 31, 2015, the Company has federal and state net operating loss carryforwards of $919,503 expiring in various years through 2034. The Company also has a foreign net operating loss carryforward of $71,765.
	The effective income tax rate for the fiscal year ended March 31, 2015 was 31.7% as compared to 33.9% for the fiscal year ended March 31, 2014. The effective income tax rate for the fiscal year ended March 31, 2015 was reduced to reflect unrecognized tax benefits of $1,051, an additional tax benefit related to a net operating loss carryback claim of $367, the benefit of $2,805 from a decrease to the state deferred tax rates and the benefit of $5,969 from the retroactive reinstatement of the R&D tax credit.
	The Company has been granted income tax holiday as an incentive to attract foreign investment by the Government of Thailand. The tax holidays expire in various years through 2026. We do not have any other tax holidays in the jurisdictions in which we operate. The income tax benefit attributable to the tax status of our subsidiaries in Thailand was approximately $1,930 or $0.04 per diluted share in fiscal 2015, $347 or $0.01 per diluted share in fiscal 2014 and $1,549 or $0.03 per diluted share in fiscal 2013.
	Cumulative undistributed earnings of foreign subsidiaries, for which no U.S. income or foreign withholding taxes have been recorded, is $27,747 at March 31, 2015. As the Company currently intends to indefinitely reinvest all such earnings, no provision has been made for income taxes that may become payable upon distribution of such earnings, and it is not practicable to determine the amount of the related unrecognized deferred income tax liability.
	The Company has classified uncertain tax positions as noncurrent income tax liabilities unless expected to be paid in one year. Penalties and tax-related interest expense are reported as a component of income tax expense. As of March 31, 2015 and 2014, the total amount of accrued income tax-related interest and penalties was $207 and $204, respectively.
	As of March 31, 2015 and 2014, the total amount of unrecognized tax benefits was $8,348 and $8,865, respectively, of which $8,348 and $8,865, respectively, would impact the effective rate, if recognized. The Company anticipates that total unrecognized tax benefits may be reduced by $0 in the next 12 months.
	With a few exceptions, the Company is no longer subject to U.S. federal income tax examinations for fiscal years ended before March 31, 2011, state or local examinations for fiscal years ended before March 31, 2011, or foreign income tax examinations by tax authorities for fiscal years ended before March 31, 2009.
	As of March 31, 2015, the Company is no longer subject to examination in any state or foreign jurisdictions. The Company has filed appeals in a prior state examination related to fiscal years ended March 31, 1999 through March 31, 2005. Because of net operating losses acquired as part of the acquisition of Vought, the Company is subject to U.S. federal income tax examinations and various state jurisdiction examinations for the years ended December 31, 2001 and after related to previously filed Vought tax returns. The Company believes appropriate provisions for all outstanding issues have been made for all jurisdictions and all open years.
	During the fiscal years ended March 31, 2015, 2014 and 2013, the Company added $4, $32 and $3 of interest and penalties related to activity for identified uncertain tax positions, respectively.
	A reconciliation of the liability for uncertain tax positions, which are included in noncurrent liabilities for the fiscal years ended March 31, 2015 and 2014 follows:
	Ending Balance—March 31, 2013	$	7,710
	Additions for tax positions related to the current year	774
	Additions for tax positions of prior years	1,475
Reductions for tax positions of prior years	(666		)
Reductions as a result of a lapse of statute of limitations	—
Settlements	—
Ending Balance—March 31, 2014	9,293
Additions for tax positions related to the current year	962
Additions for tax positions of prior years	178
Reductions for tax positions of prior years	(1,607		)
Reductions as a result of a lapse of statute of limitations	—
Settlements	—
Ending Balance—March 31, 2015	$	8,826

STOCKHOLDERS_EQUITY

STOCKHOLDERS' EQUITY	12 Months Ended
	Mar. 31, 2015
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	STOCKHOLDERS' EQUITY
	In February 2014, the Company's Board of Directors authorized an increase in the Company's existing stock repurchase program by up to 5,000,000 shares of its common stock in addition to the 500,800 shares authorized under prior authorizations. During the fiscal years ended March 31, 2015 and 2014, the Company repurchased 2,923,011 and 300,000 of its common stock for $184,380 and $19,134, respectively. As a result, as of May 21, 2015, the Company remains able to purchase an additional 2,277,789 shares. Repurchases may be made from time to time in open market transactions, block purchases, privately negotiated transactions or otherwise at prevailing prices. No time limit has been set for completion of the program.
	During the fiscal year ended March 31, 2015, the Company settled the conversion of $12,834 in principal value of the Convertible Notes, with the principal and and the conversion benefit settled in cash. During the fiscal years ended March 31, 2014, the Company settled the conversion of $96,535, in principal value of the Convertible Notes, as requested by the respective holders, with the principal settled in cash and the conversion benefit settled through the issuance of 2,290,755.
	The holders of the common stock are entitled to one vote per share on all matters to be voted upon by the stockholders of Triumph.
	The Company has preferred stock of $0.01 par value, 250,000 shares authorized. At March 31, 2015 and 2014, zero shares of preferred stock were outstanding.
	Accumulated Other Comprehensive Loss
	Changes in accumulated other comprehensive loss ("AOCI") by component for the years ended March 31, 2015 and 2014 were as follows:
		Currency Translation Adjustment			Unrealized Gains and Losses on Derivative Instruments			Defined Benefit Pension Plans and Other Postretirement Benefits					Total (1)
	Balance March 31, 2013	$	3,513		$	131		$	(64,616	)			$	(60,972	)
	OCI before reclassifications	(3,315		)	1,384			45,958					44,027
	Amounts reclassified from AOCI	—			(19		)	(1,944		)	-2		(1,963		)
	Net current period OCI	(3,315		)	1,365			44,014					42,064
	Balance March 31, 2014	198			1,496			(20,602		)			(18,908		)
	OCI before reclassifications	(46,949		)	(4,098		)	(122,667		)			(173,714		)
	Amounts reclassified from AOCI	—			(155		)	(6,133		)	(2	)	(6,288		)
	Net current period OCI	(46,949		)	(4,253		)	(128,800		)			(180,002		)
	Balance March 31, 2015	$	(46,751	)	$	(2,757	)	$	(149,402	)			$	(198,910	)
	(1) Net of tax.
	(2) Primarily relates to amortization of actuarial losses and recognized prior service (credits) costs, which are included in the net periodic pension cost of which a portion is allocated to production as inventoried costs.

EARNINGS_PER_SHARE

EARNINGS PER SHARE	12 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE
	The following is a reconciliation between the weighted-average common shares outstanding used in the calculation of basic and diluted earnings per share:
		Year ended March 31,
		2015	2014	2013
		(thousands)
	Weighted-average common shares outstanding—basic	50,796	51,711	49,663
	Net effect of dilutive stock options and nonvested stock	169	265	382
	Net effect of convertible debt	40	811	2,401
	Weighted-average common shares outstanding—diluted	51,005	52,787	52,446

PENSION_AND_OTHER_POSTRETIREME

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS	12 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS	EMPLOYEE BENEFIT PLANS
	Defined Contribution Pension Plan
	The Company sponsors a defined contribution 401(k) plan, under which salaried and certain hourly employees may defer a portion of their compensation. Eligible participants may contribute to the plan up to the allowable amount as determined by the plan of their regular compensation before taxes. The Company generally matches contributions up to 60% of the first 6% of compensation contributed by the participant, calculated as 100% of the first 2% contributed, plus 40% of the next 4% contributed. All contributions and Company matches are invested at the direction of the employee in one or more mutual funds. Company matching contributions vest immediately and aggregated $20,020, $21,208 and $19,509 for the fiscal years ended March 31, 2015, 2014 and 2013, respectively.
	Defined Benefit Pension and Other Postretirement Benefit Plans
	The Company sponsors several defined benefit pension plans covering some of its employees. Most employees are ineligible to participate in the plans or have ceased to accrue additional benefits under the plans based upon their service to the Company or years of service accrued under the defined benefit pension plans. Benefits under the defined benefit plans are based on years of service and, for most non-represented employees, on average compensation for certain years. It is the Company's policy to fund at least the minimum amount required for all qualified plans, using actuarial cost methods and assumptions acceptable under applicable government regulations, by making payments into a trust separate from us.
	In addition to the defined benefit pension plans, the Company provides certain healthcare and life insurance benefits for eligible retired employees. Such benefits are unfunded as of March 31, 2015. Employees achieve eligibility to participate in these contributory plans upon retirement from active service if they meet specified age and years of service requirements. Election to participate for some employees must be made at the date of retirement. Qualifying dependents at the date of retirement are also eligible for medical coverage. Current plan documents reserve the right to amend or terminate the plans at any time, subject to applicable collective bargaining requirements for represented employees. From time to time, changes have been made to the benefits provided to various groups of plan participants. Premiums charged to most retirees for medical coverage prior to age 65 are capped and based on years of service and are adjusted annually for changes in the cost of the plans as determined by an independent actuary. In addition to this medical inflation cost-sharing feature, the plans also have provisions for deductibles, co-payments, coinsurance percentages, out-of-pocket limits, schedules of reasonable fees, preferred provider networks, coordination of benefits with other plans and a Medicare carve-out.
	The Company also sponsors an unfunded supplemental executive retirement plan ("SERP") that provides retirement benefits to certain key employees.
	In accordance with ASC 715, the Company has recognized the funded status of the benefit obligation as of March 31, 2015, in the accompanying Consolidated Balance Sheet. The funded status is measured as the difference between the fair value of the plans' assets and the PBO or accumulated post retirement benefit obligation of the plan. The majority of the plan assets are publicly traded investments which were valued based on the market price as of the measurement date. Investments that are not publicly traded were valued based on the estimated fair value of those investments based on our evaluation of data from fund managers and comparable market data.
	The following table sets forth the Company's consolidated defined benefit pension plans for its union and non-union employees and its SERP as of March 31, 2015 and 2014, and the amounts recorded in the Consolidated Balance Sheets at March 31, 2015 and 2014. Company contributions include amounts contributed directly to plan assets and indirectly as benefits are paid from the Company's assets. Benefit payments reflect the total benefits paid from the plans and the Company's assets. Information on the plans includes both the domestic qualified and nonqualified plans and the foreign qualified plans.
		Pension Benefits								Other
										Postretirement
										Benefits
		Year ended March 31,								Year ended March 31,
		2015				2014				2015			2014
	Change in projected benefit obligations
	Projected benefit obligation at beginning of year	$	2,160,708			$	2,390,201			$	311,012		$	347,555
	Service cost	12,902				12,854				2,868			3,060
	Interest cost	90,576				92,938				12,332			12,552
	Actuarial loss (gain)	341,719				(24,361		)		(61,261		)	(22,078		)
	Acquisitions	39,575				13,324				—			—
	Plan amendments	50				58				—			—
	Participant contributions	145				—				3,339			6,449
	Curtailments	—				(7,851		)		—			—
	Settlements	—				(171,450		)		—			—
	Benefits paid	(158,638		)		(144,078		)		(29,023		)	(36,526		)
	Currency translation adjustment	(7,718		)		(927		)		—			—
	Projected benefit obligation at end of year	$	2,479,319			$	2,160,708			$	239,267		$	311,012
	Accumulated benefit obligation at end of year	$	2,464,418			$	2,148,824			$	239,267		$	311,012
	Weighted-average assumptions used to determine benefit obligations at end of year
	Discount rate	3.78		%		4.32		%		3.66		%	4.14		%
	Rate of compensation increase	3.5		%		3.5		%		N/A			N/A
		Pension Benefits								Other
										Postretirement
										Benefits
		Year ended March 31,								Year ended March 31,
		2015				2014				2015			2014
	Change in fair value of plan assets
	Fair value of plan assets at beginning of year	$	1,933,269			$	2,030,210			$	—		$	—
	Actual return on plan assets	236,782				160,297				—			—
	Settlements	—				(171,450		)		—			—
	Participant contributions	145				—				3,339			6,449
	Company contributions	112,338				46,347				25,684			30,077
	Acquisitions	39,651				12,853				—			—
	Benefits paid	(158,638		)		(144,078		)		(29,023		)	(36,526		)
	Currency translation adjustment	(7,399		)		(910		)		—			—
	Fair value of plan assets at end of year	$	2,156,148			$	1,933,269			$	—		$	—
	Funded status (underfunded)
	Funded status	$	(323,171	)		$	(227,439	)		$	(239,267	)	$	(311,012	)
	Reconciliation of amounts recognized in the consolidated balance sheets
	Pension asset—noncurrent	$	—			$	71			$	—		$	—
	Accrued benefit liability—current	(3,940		)		(3,960		)		(20,116		)	(26,038		)
	Accrued benefit liability—noncurrent	(319,231		)		(223,550		)		(219,151		)	(284,974		)
	Net amount recognized	$	(323,171	)		$	(227,439	)		$	(239,267	)	$	(311,012	)
	Reconciliation of amounts recognized in accumulated other comprehensive income
	Prior service credits	$	(20,155	)		$	(25,493	)		$	(8,682	)	$	(13,211	)
	Actuarial losses (gains)	340,034				85,076				(74,615		)	(13,354		)
	Income tax (benefits) related to above items	(118,445		)		(22,384		)		31,265			9,968
	Unamortized benefit plan costs (gains)	$	201,434			$	37,199			$	(52,032	)	$	(16,597	)
	The components of net periodic benefit cost for fiscal years ended March 31, 2015, 2014 and 2013 are as follows:
		Pension Benefits											Other
													Postretirement Benefits
		Year Ended March 31,											Year Ended March 31,
		2015				2014				2013			2015			2014			2013
	Components of net periodic pension cost
Service cost	$	12,902			$	12,854			$	18,503		$	2,868		$	3,060		$	3,538
Interest cost	90,576				92,938				98,348			12,332			12,552			15,762
Expected return on plan assets	(150,565		)		(147,545		)		(137,334		)	—			—			—
Amortization of prior service credit cost	(5,288		)		(6,731		)		(5,829		)	(4,529		)	(4,529		)	(4,529		)
Amortization of net loss	—				13,487				318			—			—			—
Curtailment (gain) loss	—				(395		)		23,662			—			—			—
Settlements	—				1,561				—			—			—			—
Special termination benefits	—				—				10,819			—			—			—
Total net periodic benefit (income) expense	$	(52,375	)		$	(33,831	)		$	8,487		$	10,671		$	11,083		$	14,771
Weighted-average assumptions used to determine net periodic pension cost
Discount rate	4.32		%		4.07		%		4.62		%	4.14		%	3.79		%	4.35		%
Expected long-term rate on assets	8.25		%		8.25		%		8.25		%	N/A			N/A			N/A
Rate of compensation increase	3.5		%		3.5		%		3.5		%	N/A			N/A			N/A
The discount rate is determined annually as of each measurement date, based on a review of yield rates associated with long-term, high-quality corporate bonds. At the end of each year, the discount rate is primarily determined using the results of bond yield curve models based on a portfolio of high-quality bonds matching notional cash inflows with the expected benefit payments for each significant benefit plan.
The expected return on plan assets is determined based on a market-related value of plan assets, which is smoothed asset value.  The market-related value of assets is calculating by recognizing investment performance that is different from that expected on a straight-line basis over five years.  Actuarial gains and losses are amortized over the average remaining expected future service for active participants, but only to the extent unrecognized gains or losses exceed a corridor equal to 10% of the greater of the projected benefit obligation or market-related value of assets.
Effective April 1, 2015, the Company is changing the period over which actuarial gains and losses are being amortized for its U.S. pension plans from the average remaining future service period of active plan participants to the average life expectancy of inactive plan participants. This change was made because the Company has determined that as of that date almost all plan participants are inactive.
During the fiscal year ended March 31, 2015, the Society of Actuaries released new mortality tables that reflect increased life expectancy for participants of U.S. pension plans. The Company has reflected these new tables, along with an updated projection scale of mortality improvements, in the measurement of our U.S. pension and other postretirement benefit plans as of March 31, 2015. This change resulted in an increase in benefit obligation.
The Company periodically experiences events or makes changes to its benefit plans that result in curtailment or special charges. Curtailments are recognized when events occur that significantly reduce the expected years of future service of present employees or eliminates the benefits for a significant number of employees for some or all of their future service.
Curtailment losses are recognized when it is probable the curtailment will occur and the effects are reasonably estimable. Curtailment gains are recognized when the related employees are terminated or a plan amendment is adopted, whichever is applicable.
As required under ASC 715, the Company remeasures plan assets and obligations during an interim period whenever a significant event occurs that results in a material change in the net periodic pension cost. The determination of significance is based on judgment and consideration of events and circumstances impacting the pension costs.
The following summarizes the key events whose effects on net periodic benefit cost and obligations are included in the tables above:
•	In March 2014, the Company announced an amendment to the retirement plan of its non-represented employee participants. Effective March 1, 2015, actively accruing participants with 30 years of service will no longer continue to accrue a benefit. Those changes resulted in a decrease in the projected pension obligation of $14,355 and a related curtailment gain of $8,427 included in "Curtailments, settlements and early retirement incentives" on the Consolidated Statement of Income for the fiscal year ended March 31, 2014.
•	In March 2014, in connection with the Company's relocation plan, the Company has restructured the remaining workforce resulting in the termination of a number of defined benefit plan participants. The Company concluded that these terminations will result in a significant reduction in the remaining service period and recorded a curtailment loss of $8,031 included in "Curtailments and early retirement incentives" on the Consolidated Statement of Income for the fiscal year ended March 31, 2014. This curtailment loss included an increase in the projected pension obligation of $6,503. Additionally, as part of the layoffs, the Company recorded an early retirement incentive severance charge of $916 included in "Selling, General and Administrative" on the Consolidated Statement of Income for the fiscal year ended March 31, 2014.
•	In December 2013, the Company completed an incentive offer in the form of lump-sum payments to non-represented deferred vested employees who were not of retirement age in lieu of any future benefits. In addition, cumulative lump-sum payments to union-represented plan participants for previously offered early retirement incentives exceeded the service and interest costs of the respective plan. The aforementioned changes led to a remeasurement of the affected plan's assets and obligations as of December 2013, which resulted in a $118,391 decrease in projected benefit obligation. Additionally, these distributions resulted in settlement charges of $1,561 and are presented on the accompanying Consolidated Statements of Income as "Early retirement incentive expense."
•	In April 2012, the Company completed an early retirement incentive offer with a portion of its second largest union-represented group of production and maintenance employees. The early retirement incentive offer provided for an increase in the pension benefits payable to covered employees who retire no later than November 30, 2012. This early retirement incentive resulted in a special termination benefit expense of $1,150 and is presented on the accompanying Consolidated Statement of Income as "Curtailments and early retirement incentives."
•	In July 2012, the Company completed a similar early retirement incentive offer to its non-represented employee participants. This early retirement incentive provided for an increase in the termination benefits payable through the pension plan to covered employees who retire no later than November 30, 2012. This early retirement incentive resulted in a special termination benefit expense of $1,957 and is presented on the accompanying Consolidated Statement of Income as "Curtailments and early retirement incentives," as well as severance charges of $1,182 included in "Acquisition and integration expenses" on the accompanying Consolidated Statement of Income.
•	In October 2012, the Company completed an early retirement incentive offer with a portion of its largest union-represented group of production and maintenance employees. The early retirement offer provided for an increase in the pension benefits to covered employees who retire no later than March 31, 2013. This early retirement incentive resulted in a special termination benefit expense of $2,030 and is presented on the accompanying Consolidated Statement of Income within "Curtailments and early retirement incentives."
•	In February 2013, the Company completed a second early retirement incentive offer with an expanded portion of its largest union-represented group of production and maintenance employees. The early retirement offer provided for the same increase, as the October 2012 offer, in pension benefits to covered employees who retire no later than September 1, 2013. This early retirement incentive resulted in a special termination benefit expense of $5,682. In addition, the Company concluded that the February 2013 offer and the October 2012 offer represented such similar actions that they needed to be combined to assess whether the resulting change in the remaining service period indicated that a curtailment had occurred. The Company concluded that a curtailment had occurred and recorded a curtailment loss of $21,843 included in "Curtailments and early retirement incentives" on the Consolidated Statement of Income for the fiscal year ended March 31, 2013.
•	In February 2013, the Company committed to a plan to relocate from its largest operating facility. In connection with this relocation plan, the Company will exit this facility's Fabrications operations resulting in the termination of a number of defined benefit plan participants. The Company concluded that these terminations will result in a significant reduction in the remaining service period and recorded a curtailment loss of $1,819 included in "Curtailments and early retirement incentives" on the Consolidated Statement of Income for the fiscal year ended March 31, 2013.
The following table shows those amounts expected to be recognized in net periodic benefit costs during the fiscal year ending March 31, 2015:
	Pension				Other
	Benefits				Postretirement
					Benefits
Amounts expected to be recognized in FY 2016 net periodic benefit costs
Prior service cost/(credit) ($3,297 and $2,830 net of tax, respectively)	$	(5,278	)		$	(4,530	)
Actuarial (loss)/gain ($6,577 and ($4,035) net of tax, respectively)	$	(10,521	)		$	6,460
Expected Pension Benefit Payments
The total estimated future benefit payments for the pension plans are expected to be paid from the plan assets and company funds. The other postretirement plan benefit payments reflect the Company's portion of the funding. Estimated future benefit payments from plan assets and Company funds for the next ten years are as follows:
Year	Pension				Other
	Benefits				Postretirement
					Benefits*
2016	$	181,617			$	20,482
2017	174,814				19,714
2018	171,769				19,083
2019	167,056				19,022
2020	165,079				18,373
2020 - 2024	784,000				81,210
* Net of expected Medicare Part D subsidies of $930 to $1,460 per year.
Plan Assets, Investment Policy and Strategy
The table below sets forth the Company's target asset allocation for fiscal 2015 and the actual asset allocations at March 31, 2015 and 2014.
			Actual
	Target		Allocation
	Allocation		March 31,
Asset Category	Fiscal 2015		2015			2014
Equity securities	50 - 65%		45	%		47	%
Fixed income securities	20 - 45%		51			48
Alternative investment funds	2 - 10%		4			5
Total			100	%		100	%
Pension plan assets are invested in various asset classes that are expected to produce a sufficient level of diversification and investment return over the long-term. The investment goals are to exceed the assumed actuarial rate of return over the long-term within reasonable and prudent levels of risks and to meet future obligations.
Asset/liability studies are conducted on a regular basis to provide guidance in setting investment goals for the pension portfolio and its asset allocation. The asset allocation aims to prudently achieve a strong, risk-adjusted return while seeking to minimize funding level volatility and improve the funded status of the plans. The pension plans currently employ a liability-driven investment (LDI) approach, where assets and liabilities move in the same direction. The goal is to limit the volatility of the funding status and cover part, but not all, of the changes in liabilities. Most of the liabilities' changes are due to interest rate movements.
To balance expected risk and return, allocation targets are established and monitored against acceptable ranges. All investment policies and procedures are designed to ensure that the plans' investments are in compliance with the Employee Retirement Income Security Act of 1974 ("ERISA"). Guidelines are established defining permitted investments within each asset class. Each investment manager has contractual guidelines to ensure that investments are made within the parameters of their asset class or in the case of multi-asset class managers, the parameters of their multi-asset class strategy. Certain investments are not permitted at any time including investment directly in employer securities and uncovered short sales.
The tables below provide the fair values of the Company's plan assets at March 31, 2015 and 2014 by asset category. The table also identifies the level of inputs used to determine the fair value of assets in each category (see Note 2 for definition of levels).
March 31, 2015
	Level 1				Level 2				Level 3			Total
Assets
Cash and cash equivalents	$	91,499			$	1,562			$	—		$	93,061
Equity securities
International	181,061				—				—			181,061
US equity	72,911				—				—			72,911
US commingled fund	619,297				—				—			619,297
International commingled fund	47,366				68,165				—			115,531
Fixed income securities
Corporate bonds	—				25,604				—			25,604
Government securities	—				182,456				—			182,456
US commingled fund	676,557				90,341				—			766,898
International commingled fund	10,174				3,512							13,686
Other fixed income	—				8,415				—			8,415
Other
Private equity and infrastructure	—				—				79,692			79,692
Insurance contracts	—				—				920			920
Total investment in securities—assets	$	1,698,865			$	380,055			$	80,612		$	2,159,532
Receivables												2,609
Payables												(5,993		)
Total plan assets												$	2,156,148
March 31, 2014
	Level 1				Level 2				Level 3			Total
Assets
Cash and cash equivalents	$	26,261			$	805			$	—		$	27,066
Equity securities
International	196,008				—				—			196,008
US equity	70,520				—				—			70,520
US commingled fund	563,116				—				—			563,116
International commingled fund	26,579				42,497				—			69,076
Fixed income securities
Corporate bonds	—				19,628				—			19,628
Government securities	—				163,241				—			163,241
Commingled fund	636,476				88,125				—			724,601
Mortgage-backed securities	—				8,362				—			8,362
Other
Private equity and infrastructure	—				—				89,113			89,113
Total investment in securities—assets	$	1,518,960			$	322,658			$	89,113		$	1,930,731
Receivables												2,568
Payables												(30		)
Total plan assets												$	1,933,269
Cash equivalents and other short-term investments are primarily held in registered short-term investment vehicles which are valued using a market approach based on quoted market prices of similar instruments.
Public equity securities, including common stock, are primarily valued using a market approach based on the closing fair market prices of identical instruments in the principal market on which they are traded. Commingled funds that are open-ended mutual funds for which the fair value per share is determined and published by the respective mutual fund sponsor and is the basis for current observable transactions are categorized as Level 1 fair value measures. All other commingled investment funds for which the Company uses NAV as a practical expedient to estimate fair value per unit are categorized as Level 2 as long as they do not have redemption restrictions as of the measurement date. All commingled investment funds with redemption restrictions as of the measurement date are categorized as Level 3, if any. The NAV is the total value of the fund divided by the number of shares outstanding.
Corporate, government agency bonds and mortgage-backed securities are primarily valued using a market approach with inputs that include broker quotes, benchmark yields, base spreads and reported observable trades for identical or comparable instruments.
Other investments include private equity and infrastructure funds and insurance contracts. Investments in private equity and infrastructure funds are carried at estimated fair value based on NAV as a practical expedient and other appropriate adjustments to NAV as determined based on an evaluation of data provided by fund managers, including valuations of the underlying investments derived using inputs such as cost, operating results, discounted future cash flows, and market-based comparable data.
The following table represents a rollforward of the balances of our pension plan assets that are valued using Level 3 inputs:
	March 31, 2014				Acquisitions				Net Purchases			Net Realized			Net Unrealized			March 31, 2015
	Balance								(Sales)			Appreciation			Appreciation			Balance
												(Depreciation)			(Depreciation)
Private equity funds	$	89,113			—				$	(20,757	)	$	(1,002	)	$	12,338		$	79,692
Insurance contracts	$	—			920				$	—		$	—		$	—		$	920
Total	$	89,113			$	920			$	(20,757	)	$	(1,002	)	$	12,338		$	80,612
	March 31, 2013 Balance				Net Purchases				Net Realized			Net Unrealized			March 31, 2014
					(Sales)				Appreciation			Appreciation			Balance
									(Depreciation)			(Depreciation)
Private equity funds	$	95,015			$	(18,976	)		$	11,157		$	1,917		$	89,113
Assumptions and Sensitivities
The discount rate is determined as of each measurement date, based on a review of yield rates associated with long-term, high-quality corporate bonds. The calculation separately discounts benefit payments using the spot rates from a long-term, high-quality corporate bond yield curve.
The effect of a 25 basis-point change in discount rates as of March 31, 2015 is shown below:
		Pension Benefits				Other
						Postretirement
						Benefits
Increase of 25 basis points
Obligation	*	$	(72,900	)		$	(5,407	)
Net periodic expense		(800		)		414
Decrease of 25 basis points
Obligation	*	$	76,600			$	5,644
Net periodic expense		600				(431		)
* Excludes impact to plan assets due to the LDI investment approach discussed above under "Plan Assets, Investment Policy and Strategy."
The long-term rate of return assumption represents the expected average rate of earnings on the funds invested to provide for the benefits included in the benefit obligations. The long-term rate of return assumption is determined based on a number of factors, including historical market index returns, the anticipated long-term asset allocation of the plans, historical plan return data, plan expenses and the potential to outperform market index returns. The expected long-term rate of return on assets was 8.25%. For fiscal 2016, the expected long-term rate of return is 8.25%.
A significant factor used in estimating future per capita cost of covered healthcare benefits for our retirees and us is the healthcare cost trend rate assumption. The rate used at March 31, 2015 was 6.80% and is assumed to decrease gradually to 4.50% by fiscal 2027 and remain at that level thereafter. The effect of a one-percentage-point change in the healthcare cost trend rate in each year is shown below:
	Other Postretirement Benefits
	One-Percentage-				One-Percentage-
	Point Increase				Point Decrease
Net periodic expense	$	453			$	(403	)
Obligation	8,142				(7,225		)
Anticipated Contributions to Defined Benefit Plans
Assuming a normal retirement age of 65, the Company expects to contribute $40,000 to its defined benefit pension plans and $20,400 to its OPEB during fiscal 2016. No plan assets are expected to be returned to the Company in fiscal 2016.

STOCK_COMPENSATION_PLANS

STOCK COMPENSATION PLANS	12 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	STOCK COMPENSATION PLANS
	The Company has stock incentive plans under which employees and non-employee directors may be granted options to purchase shares of the Company's common stock at the fair value at the time of the grant. Employee options and non-employee director options are fully vested as of March 31, 2015. There were no employee or non-employee director options granted during fiscal years ended March 31, 2015, 2014 and 2013.
	Since fiscal 2006, the Company approved the granting of restricted stock as its primary form of share-based incentive. The restricted shares are subject to forfeiture should the grantee's employment be terminated prior to the third or fourth anniversary of the date of grant, and are included in capital in excess of par value. Restricted shares generally vest in full after three or four years. The fair value of restricted shares under the Company's restricted stock plans is determined by the product of the number of shares granted and the grant date market price of the Company's common stock. Certain of these awards contain performance conditions, in addition to service conditions. The fair value of restricted shares is expensed on a straight-line basis over the requisite service period of three or four years.
	The Company recognized $1,272, $4,653 and $6,367 of share-based compensation expense during the fiscal years ended March 31, 2015, 2014 and 2013, respectively. The total income tax benefit recognized for share-based compensation arrangements for fiscal years ended March 31, 2015, 2014 and 2013 was $445, $1,629 and $2,228, respectively.
	A summary of the Company's stock option activity and related information for its option plans for the fiscal year ended March 31, 2015 was as follows:
		Options		Weighted-		Weighted-	Aggregate
				Average		Average	Intrinsic Value
				Exercise		Remaining
				Price		Contractual
						Term (in Years)
	Outstanding at March 31, 2014	49,718		$	15.72
	Exercised	(45,782	)	15.72
	Forfeited	—		—
	Outstanding at March 31, 2015	3,936		$	15.37	0.1	$	195,777
	Exercisable at March 31, 2015	3,936		$	15.37	0.1	$	195,777
	As of March 31, 2015 and 2014, all stock options are fully vested with no expected future compensation expense related to them. The intrinsic value of stock options exercised during the fiscal years ended March 31, 2015, 2014 and 2013 was $2,234, $1,043 and $6,281, respectively. During April 2015, the balance of outstanding stock options expired.
	At March 31, 2015 and 2014, 2,218,427 shares and 2,227,227 shares of common stock, respectively, were available for issuance under the plans. A summary of the status of the Company's nonvested shares of restricted stock and deferred stock units as of March 31, 2015 and changes during the fiscal year ended March 31, 2015, is presented below:
		Shares		Weighted-
				Average Grant
				Date Fair Value
	Nonvested restricted stock and deferred stock units at March 31, 2014	271,211		$	59.37
	Granted	8,800		64.44
	Vested	(103,129	)	55.49
	Forfeited	(1,500	)	72.76
	Nonvested restricted stock and deferred stock units at March 31, 2015	175,382		$	61.79
	The fair value of restricted stock which vested during fiscal 2015 was $9,157. The tax benefit from vested restricted stock was $673, $2,726 and $1,840 during the fiscal years ended March 31, 2015, 2014 and 2013, respectively. The weighted-average grant date fair value of share-based grants in the fiscal years ended March 31, 2015, 2014 and 2013 was $64.44, $79.80 and $62.25, respectively. Expected future compensation expense on restricted stock net of expected forfeitures, is approximately $1,188, which is expected to be recognized over the remaining weighted-average vesting period of 1.3 years.
	During the fiscal years ended March 31, 2015, 2014 and 2013, 8,800, 7,875 and 17,000 deferred stock units were granted to the non-employee members of the Board of Directors, respectively, under the Directors' Plan. Each deferred stock unit represents the contingent right to receive one share of the Company's common stock. The deferred stock units vest over a three or four-year period and the shares of common stock underlying vested deferred stock units will be delivered on January 1 of the year following the year in which the non-employee director terminates service as a Director of the Company.

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	COMMITMENTS AND CONTINGENCIES
	Trade Secret Litigation over Claims of Eaton Corporation
	On July 9, 2004, Eaton Corporation and several of its subsidiaries ("Eaton") sued the Company, a subsidiary and certain employees of the Company and the subsidiary on claims alleging misappropriation of trade secrets and intellectual property allegedly belonging to Eaton relating to the design and manufacture of hydraulic pumps and motors used in military and commercial aviation. The subsidiary and the individual engineer defendants answered Eaton's claims and filed counterclaims. In the course of discovery in the suit, the court began an investigation of allegations of wrongdoing by Eaton in its conduct of the litigation. On December 22, 2010, the court dismissed all of Eaton's claims with prejudice based on the court's conclusion that a fraud had been perpetrated on the court by counsel for Eaton, of which Eaton was aware or should have been aware. Eaton appealed, but on November 21, 2013, the Supreme Court of Mississippi, in a unanimous en banc decision, affirmed the lower court’s dismissal. Eaton moved for a rehearing of the Mississippi Supreme Court's affirmance but on March 20, 2014, the Supreme Court denied Eaton's motion for rehearing. Meanwhile, the Company, several subsidiaries, and the employees sued by Eaton pursued claims (including antitrust claims) and counterclaims against Eaton based on the Eaton misconduct that led to the dismissal of Eaton's claims.
	On June 18, 2014, the Company announced it had settled all pending litigation involving the Company, its subsidiary the employees and Eaton. As part of the settlement, Eaton agreed to pay the Company $135,300 in cash. During the fiscal year ended March 31, 2015, the Company received payment representing a gain on legal settlement, net of expense, of $134,693, which is included on the Consolidated Statements of Income.
	Other
	Certain of the Company's business operations and facilities are subject to a number of federal, state, local and foreign environmental laws and regulations. Former owners generally indemnify the Company for environmental liabilities related to the assets and businesses acquired which existed prior to the acquisition dates. In the opinion of management, there are no significant environmental contingent liabilities which would have a material effect on the financial condition or operating results of the Company which are not covered by such indemnification.
	The Company's risk related to pension projected obligations as of March 31, 2015 is significant. This amount is currently in excess of the related plan assets. Benefit plan assets are invested in a diversified portfolio of investments in both the equity and debt categories, as well as limited investments in real estate and other alternative investments. The market value of all of these investment categories may be adversely affected by external events and the movements and volatility in the financial markets including such events as the current credit and real estate market conditions. Declines in the market values of our plan assets could expose the total asset balance to significant risk which may cause an increase to future funding requirements. The Company's potential risk related to OPEB projected obligations as of March 31, 2015 is also significant.
	Some raw materials and operating supplies are subject to price and supply fluctuations caused by market dynamics. The Company's strategic sourcing initiatives seek to find ways of mitigating the inflationary pressures of the marketplace. In recent years, these inflationary pressures have affected the market for raw materials. However, the Company believes that raw material prices will remain stable through the remainder of fiscal 2015 and after that, experience increases that are in line with inflation. Additionally, the Company generally does not employ forward contracts or other financial instruments to hedge commodity price risk.
	The Company's suppliers' failure to provide acceptable raw materials, components, kits and subassemblies would adversely affect production schedules and contract profitability. The Company maintains an extensive qualification and performance surveillance system to control risk associated with such supply base reliance. The Company is dependent on third parties for certain information technology services. To a lesser extent, the Company is also exposed to fluctuations in the prices of certain utilities and services, such as electricity, natural gas, chemical processing and freight. The Company utilizes a range of long-term agreements and strategic aggregated sourcing to optimize procurement expense and supply risk in these categories.
	In the ordinary course of business, the Company is also involved in disputes, claims, lawsuits, and governmental and regulatory inquiries that it deems to be immaterial. Some may involve claims or potential claims of substantial damages, fines or penalties. While the Company cannot predict the outcome of any pending or future litigation or proceeding and no assurances can be given, the Company does not believe that any pending matter will have a material effect, individually or in the aggregate, on its financial position or results of operations.

RELOCATION_COSTS_RELOCATION_CO

RELOCATION COSTS RELOCATION COSTS	12 Months Ended
	Mar. 31, 2015
Relocation Costs [Abstract]
Restructuring, Impairment, and Other Activities Disclosure [Text Block]	RELOCATION COSTS
	During the fiscal year ended March 31, 2013, the Company committed to relocate the operations of its largest facility in Dallas, Texas and to expand its Red Oak, Texas ("Red Oak") facility to accommodate this relocation. The Company incurred approximately $86,640 in capital expenditures during the fiscal years ended March 31, 2014, associated with this plan. The Company incurred $3,193 and $31,290 of moving expenses related to the relocation during the fiscal year ended March 31, 2015 and 2014, shown separately on the Consolidated Statements of Income. The relocation was substantially completed during the fiscal year ended March 31, 2014.

CUSTOMER_CONCENTRATION

CUSTOMER CONCENTRATION	12 Months Ended
	Mar. 31, 2015
Customer Concentration [Abstract]
Concentration Risk Disclosure [Text Block]	CUSTOMER CONCENTRATION
	Trade accounts receivable from The Boeing Company ("Boeing") represented approximately 13% and 32% of total accounts receivable as of March 31, 2015 and 2014, respectively. The Company had no other significant concentrations of credit risk. Sales to Boeing for fiscal 2015 were $1,634,367, or 42% of net sales, of which $1,441,892, $161,196 and $31,279 were from the Aerostructures segment, the Aerospace Systems segment and the Aftermarket Services segment, respectively. Sales to Boeing for fiscal 2014 were $1,689,635, or 45% of net sales, of which $1,576,113, $87,374 and $26,148 were from the Aerostructures segment, the Aerospace Systems segment and the Aftermarket Services segment, respectively. Sales to Boeing for fiscal 2013 were $1,829,200, or 49% of net sales, of which $1,719,485, $73,794 and $35,921 were from the Aerostructures segment, the Aerospace Systems segment and the Aftermarket Services segment, respectively. No other single customer accounted for more than 10% of the Company's net sales; however, the loss of any significant customer, including Boeing, could have a material adverse effect on the Company and its operating subsidiaries.
	The Company currently generates a majority of its revenue from clients in the commercial aerospace industry, the military, and the regional airline industry. The Company's growth and financial results are largely dependent on continued demand for its products and services from clients in these industries. If any of these industries experiences a downturn, clients in these sectors may conduct less business with the Company.
	COLLECTIVE BARGAINING AGREEMENTS
	Approximately 19% of the Company's labor force is covered under collective bargaining agreements. As of March 31, 2015, approximately 42% of the Company's collectively bargained workforce are working under contracts that have expired or are set to expire within one year.

COLLECTIVE_BARGAINING_AGREEMEN

COLLECTIVE BARGAINING AGREEMENTS	12 Months Ended
	Mar. 31, 2015
Collective Bargaining Agreements [Abstract]
Concentration Risk Disclosure [Text Block]	CUSTOMER CONCENTRATION
	Trade accounts receivable from The Boeing Company ("Boeing") represented approximately 13% and 32% of total accounts receivable as of March 31, 2015 and 2014, respectively. The Company had no other significant concentrations of credit risk. Sales to Boeing for fiscal 2015 were $1,634,367, or 42% of net sales, of which $1,441,892, $161,196 and $31,279 were from the Aerostructures segment, the Aerospace Systems segment and the Aftermarket Services segment, respectively. Sales to Boeing for fiscal 2014 were $1,689,635, or 45% of net sales, of which $1,576,113, $87,374 and $26,148 were from the Aerostructures segment, the Aerospace Systems segment and the Aftermarket Services segment, respectively. Sales to Boeing for fiscal 2013 were $1,829,200, or 49% of net sales, of which $1,719,485, $73,794 and $35,921 were from the Aerostructures segment, the Aerospace Systems segment and the Aftermarket Services segment, respectively. No other single customer accounted for more than 10% of the Company's net sales; however, the loss of any significant customer, including Boeing, could have a material adverse effect on the Company and its operating subsidiaries.
	The Company currently generates a majority of its revenue from clients in the commercial aerospace industry, the military, and the regional airline industry. The Company's growth and financial results are largely dependent on continued demand for its products and services from clients in these industries. If any of these industries experiences a downturn, clients in these sectors may conduct less business with the Company.
	COLLECTIVE BARGAINING AGREEMENTS
	Approximately 19% of the Company's labor force is covered under collective bargaining agreements. As of March 31, 2015, approximately 42% of the Company's collectively bargained workforce are working under contracts that have expired or are set to expire within one year.

SEGMENTS

SEGMENTS	12 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
SEGMENTS	SEGMENTS
	The Company reports financial performance based on the following three reportable segments: the Aerostructures Group, the Aerospace Systems Group and the Aftermarket Services Group. The Company's CODM utilizes Adjusted EBITDA as a primary measure of profitability to evaluate performance of its segments and allocate resources.
	The Aerostructures segment consists of the Company's operations that manufacture products primarily for the aerospace OEM market. The Aerostructures segment's revenues are derived from the design, manufacture, assembly and integration of metallic and composite aerostructures and structural components, including aircraft wings, fuselage sections, tail assemblies, engine nacelles, flight control surfaces as well as helicopter cabins. Further, the segment's operations also design and manufacture composite assemblies for floor panels and environmental control system ducts. These products are sold to various aerospace OEMs on a global basis.
	The Aerospace Systems segment consists of the Company's operations that also manufacture products primarily for the aerospace OEM market. The segment's operations design and engineer mechanical and electromechanical controls, such as hydraulic systems, main engine gearbox assemblies, engine control systems, accumulators, mechanical control cables and non-structural cockpit components. These products are sold to various aerospace OEMs on a global basis.
	The Aftermarket Services segment consists of the Company's operations that provide maintenance, repair and overhaul services to both commercial and military markets on components and accessories manufactured by third parties. Maintenance, repair and overhaul revenues are derived from services on auxiliary power units, airframe and engine accessories, including constant-speed drives, cabin compressors, starters and generators, and pneumatic drive units. In addition, the segment's operations repair and overhaul thrust reversers, nacelle components and flight control surfaces. The segment's operations also perform repair and overhaul services and supply spare parts for various types of cockpit instruments and gauges for a broad range of commercial airlines on a worldwide basis.
	Segment Adjusted EBITDA is total segment revenue reduced by operating expenses (less depreciation and amortization) identifiable with that segment. Corporate includes general corporate administrative costs and any other costs not identifiable with one of the Company's segments, including a gain on legal settlement, net of expenses, of $134,693 for the fiscal year ended March 31, 2015.
	The Company does not accumulate net sales information by product or service or groups of similar products and services, and therefore the Company does not disclose net sales by product or service because to do so would be impracticable.
	Selected financial information for each reportable segment and the reconciliation of Adjusted EBITDA to operating income before interest is as follows:
		Year Ended March 31,
		2015			2014			2013
	Net sales:
	Aerostructures	$	2,507,878		$	2,612,439		$	2,781,344
	Aerospace systems	1,089,117			871,750			615,771
	Aftermarket services	304,013			287,343			314,507
	Elimination of inter-segment sales	(12,286		)	(8,278		)	(8,920		)
		$	3,888,722		$	3,763,254		$	3,702,702
	Income before income taxes:
	Operating income (loss):
	Aerostructures	$	127,495		$	252,910		$	469,873
	Aerospace systems	184,042			149,721			103,179
	Aftermarket services	47,931			42,265			45,380
	Corporate	75,205			(44,892		)	(87,219		)
		434,673			400,004			531,213
	Interest expense and other	85,379			87,771			68,156
		$	349,294		$	312,233		$	463,057
	Depreciation and amortization:
	Aerostructures	$	100,096		$	114,302		$	95,884
	Aerospace systems	45,200			37,453			19,870
	Aftermarket services	8,559			7,529			9,118
	Corporate	4,468			4,993			4,634
		$	158,323		$	164,277		$	129,506
	Amortization of acquired contract liabilities, net:
	Aerostructures	$	38,719		$	25,207		$	25,457
	Aerospace systems	37,014			17,422			187
		$	75,733		$	42,629		$	25,644
	Adjusted EBITDA:
	Aerostructures	$	188,872		$	342,005		$	540,300
	Aerospace systems	192,228			169,752			122,862
	Aftermarket services	56,490			49,794			54,498
	Corporate	(55,020		)	(38,733		)	(48,104		)
		$	382,570		$	522,818		$	669,556
		Year Ended March 31,
		2015			2014			2013
	Capital expenditures:
	Aerostructures	$	72,242		$	167,198		$	90,466
	Aerospace systems	30,531			21,935			19,388
	Aftermarket services	5,645			13,940			14,820
	Corporate	1,586			3,341			2,216
		$	110,004		$	206,414		$	126,890
		March 31,
		2015			2014
	Total Assets:
	Aerostructures	$	4,004,642		$	3,880,645
	Aerospace systems	1,474,362			1,255,136
	Aftermarket services	375,786			316,643
	Corporate	214,653			100,962
		$	6,069,443		$	5,553,386
	During fiscal years ended March 31, 2015, 2014 and 2013, the Company had foreign sales of $753,075, $621,625 and $504,079, respectively. The Company reports as foreign sales those sales with delivery points outside of the United States. As of March 31, 2015 and 2014, the Company had foreign long-lived assets of $366,846 and $289,027, respectively.

SELECTED_CONSOLIDATING_FINANCI

SELECTED CONSOLIDATING FINANCIAL STATEMENTS OF PARENT, GUARANTORS AND NON-GUARANTORS	12 Months Ended
	Mar. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
SELECTED CONSOLIDATING FINANCIAL STATEMENTS OF PARENT, GUARANTORS AND NON-GUARANTORS	SELECTED CONSOLIDATING FINANCIAL STATEMENTS OF PARENT, GUARANTORS AND NON-GUARANTORS
	The Company's the 2018 Notes and the 2021 Notes are fully and unconditionally guaranteed on a joint and several basis by Guarantor Subsidiaries. The total assets, stockholder's equity, revenue, earnings and cash flows from operating activities of the Guarantor Subsidiaries exceeded a majority of the consolidated total of such items as of and for the periods reported. The only consolidated subsidiaries of the Company that are not guarantors of the 2018 Notes and the 2021 Notes (the "Non-Guarantor Subsidiaries") are: (i) the receivables securitization special purpose entity, and (ii) the foreign operating subsidiaries. The following tables present condensed consolidating financial statements including Triumph Group, Inc. (the "Parent"), the Guarantor Subsidiaries, and the Non-Guarantor Subsidiaries. Such financial statements include balance sheets as of March 31, 2015 and 2014, statements of income and comprehensive income for the fiscal years ended March 31, 2015, 2014 and 2013, and statements of cash flows for the fiscal years ended March 31, 2015, 2014 and 2013.
	SUMMARY CONSOLIDATING BALANCE SHEETS:
		March 31, 2015
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries						Total
	Current assets:
	Cash and cash equivalents	$	620		$	419		$	31,578		$	—		$	32,617
	Trade and other receivables, net	3,578			180,796			337,472			—			521,846
	Inventories	—			1,193,528			79,351			—			1,272,879
	Rotable assets	—			35,248			13,572			—			48,820
	Deferred income taxes	—			145,352			—			—			145,352
	Prepaid expenses and other	6,509			10,580			6,011			—			23,100
	Total current assets	10,707			1,565,923			467,984			—			2,044,614
	Property and equipment, net	8,209			806,442			134,251			—			948,902
	Goodwill and other intangible assets, net	—			2,783,117			219,866			—			3,002,983
	Other, net	24,601			34,955			13,388			—			72,944
	Intercompany investments and advances	4,062,058			81,540			63,897			(4,207,495		)	—
	Total assets	$	4,105,575		$	5,271,977		$	899,386		$	(4,207,495	)	$	6,069,443
	Current liabilities:
	Current portion of long-term debt	$	19,024		$	23,231		$	—		$	—		$	42,255
	Accounts payable	8,919			380,457			38,072			—			427,448
	Accrued expenses	38,275			326,455			63,010			—			427,740
	Total current liabilities	66,218			730,143			101,082			—			897,443
	Long-term debt, less current portion	1,166,095			71,046			100,000			—			1,337,141
	Intercompany debt	719,525			1,769,564			407,722			(2,896,811		)	—
	Accrued pension and other postretirement benefits, noncurrent	7,517			527,741			3,123			—			538,381
	Deferred income taxes and other	10,435			1,088,896			61,363			—			1,160,694
	Total stockholders' equity	2,135,785			1,084,587			226,096			(1,310,684		)	2,135,784
	Total liabilities and stockholders' equity	$	4,105,575		$	5,271,977		$	899,386		$	(4,207,495	)	$	6,069,443
	SUMMARY CONSOLIDATING BALANCE SHEETS:
		March 31, 2014
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries						Total
	Current assets:
	Cash and cash equivalents	$	2,820		$	1,149		$	25,029		$	—		$	28,998
	Trade and other receivables, net	1,591			226,407			289,306			—			517,304
	Inventories	—			1,041,719			70,048			—			1,111,767
	Rotable assets	—			28,113			13,553			—			41,666
	Deferred income taxes	—			57,291			17			—			57,308
	Prepaid and other	6,977			13,674			4,246			—			24,897
	Total current assets	11,388			1,368,353			402,199			—			1,781,940
	Property and equipment, net	9,933			801,560			119,937			—			931,430
	Goodwill and other intangible assets, net	—			2,625,121			144,941			—			2,770,062
	Other, net	58,536			7,860			3,558			—			69,954
	Intercompany investments and advances	4,094,443			84,180			12,333			(4,190,956		)	—
	Total assets	$	4,174,300		$	4,887,074		$	682,968		$	(4,190,956	)	$	5,553,386
	Current liabilities:
	Current portion of long-term debt	$	31,844		$	17,731		$	—		$	—		$	49,575
	Accounts payable	1,150			296,968			19,216			—			317,334
	Accrued expenses	36,034			212,984			24,272			—			273,290
	Total current liabilities	69,028			527,683			43,488			—			640,199
	Long-term debt, less current portion	1,279,694			58,714			162,400			—			1,500,808
	Intercompany debt	525,216			2,021,330			304,613			(2,851,159		)	—
	Accrued pension and other postretirement benefits, noncurrent	6,795			501,716			13			—			508,524
	Deferred income taxes and other	9,656			586,174			24,114			—			619,944
	Total stockholders' equity	2,283,911			1,191,457			148,340			(1,339,797		)	2,283,911
	Total liabilities and stockholders' equity	$	4,174,300		$	4,887,074		$	682,968		$	(4,190,956	)	$	5,553,386
	CONDENSED CONSOLIDATING STATEMENTS OF INCOME AND COMPREHENSIVE INCOME:
		Fiscal year ended March 31, 2015
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries						Total
	Net sales	$	—		$	3,592,062		$	320,907		$	(24,247	)	$	3,888,722
	Operating costs and expenses:
Cost of sales	—			2,900,408			265,292			(24,247		)	3,141,453
Selling, general and administrative	50,562			199,569			35,642			—			285,773
Depreciation and amortization	2,269			141,561			14,493			—			158,323
Relocation costs	—			3,193			—			—			3,193
Gain on legal settlement, net of expenses	(134,693		)	—			—			—			(134,693		)
	(81,862		)	3,244,731			315,427			(24,247		)	3,454,049
Operating income	81,862			347,331			5,480			—			434,673
Intercompany interest and charges	(205,075		)	196,394			8,681			—			—
Interest expense and other	85,555			10,438			(10,614		)	—			85,379
Income from continuing operations, before income taxes	201,382			140,499			7,413			—			349,294
Income tax expense (income)	58,049			54,359			(1,811		)	—			110,597
Net income	143,333			86,140			9,224			—			238,697
Other comprehensive income	(4,253		)	(128,800		)	(46,949		)	—			(180,002		)
Total comprehensive income	$	139,080		$	(42,660	)	$	(37,725	)	$	—		$	58,695
CONDENSED CONSOLIDATING STATEMENTS OF INCOME AND COMPREHENSIVE INCOME:
	Fiscal year ended March 31, 2014
	Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
				Subsidiaries			Subsidiaries						Total
Net sales	$	—		$	3,569,094		$	197,987		$	(3,827	)	$	3,763,254
Operating costs and expenses:
Cost of sales	—			2,760,627			155,002			(3,827		)	2,911,802
Selling, general and administrative	36,670			192,422			25,623			—			254,715
Depreciation and amortization	2,782			152,593			8,902			—			164,277
Relocation costs	—			31,290			—			—			31,290
Curtailments, settlements and early retirement incentives	1,166			—			—			—			1,166
	40,618			3,136,932			189,527			(3,827		)	3,363,250
Operating (loss) income	(40,618		)	432,162			8,460			—			400,004
Intercompany interest and charges	(215,079		)	207,397			7,682			—			—
Interest expense and other	86,094			6,103			(4,426		)	—			87,771
Income from continuing operations, before income taxes	88,367			218,662			5,204			—			312,233
Income tax expense	20,478			85,061			438			—			105,977
Net income	67,889			133,601			4,766			—			206,256
Other comprehensive income (loss)	1,481			43,898			(3,315		)	—			42,064
Total comprehensive income	$	69,370		$	177,499		$	1,451		$	—		$	248,320
CONDENSED CONSOLIDATING STATEMENTS OF INCOME AND COMPREHENSIVE INCOME:
	Fiscal year ended March 31, 2013
	Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
				Subsidiaries			Subsidiaries						Total
Net sales	$	—		$	3,608,064		$	99,593		$	(4,955	)	$	3,702,702
Operating costs and expenses:
Cost of sales	—			2,703,416			65,027			(4,955		)	2,763,488
Selling, general and administrative	8,530			213,408			19,411			—			241,349
Depreciation and amortization	2,430			122,626			4,450			—			129,506
Acquisition and integration	588			2,077			—			—			2,665
Curtailments and early retirement incentives	34,481			—			—			—			34,481
	46,029			3,041,527			88,888			(4,955		)	3,171,489
Operating (loss) income	(46,029		)	566,537			10,705			—			531,213
Intercompany interest and charges	(191,025		)	187,713			3,312			—			—
Interest expense and other	61,962			9,463			(3,269		)	—			68,156
Income from continuing operations, before income taxes	83,034			369,361			10,662			—			463,057
Income tax expense	24,782			139,799			1,129			—			165,710
Net income	58,252			229,562			9,533			—			297,347
Other comprehensive loss	—			(49,834		)	(1,832		)	—			(51,666		)
Total comprehensive income	$	58,252		$	179,728		$	7,701		$	—		$	245,681
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS:
	Fiscal year ended March 31, 2015
	Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
				Subsidiaries			Subsidiaries						Total
Net income	$	143,333		$	86,140		$	9,224		$	—		$	238,697
Adjustments to reconcile net income to net cash (used in) provided by operating activities	(154,295		)	397,607			(25,590		)	10,913			228,635
Net cash provided by (used in) operating activities	(10,962		)	483,747			(16,366		)	10,913			467,332
Capital expenditures	(905		)	(92,686		)	(16,413		)	—			(110,004		)
Reimbursements of capital expenditures	—			653			—			—			653
Proceeds from sale of assets and businesses	—			3,092			75			—			3,167
Cash used for businesses and intangible assets acquired	—			112,110			(73,829		)	—			38,281
Net cash (used in) provided by investing activities	(905		)	23,169			(90,167		)	—			(67,903		)
Net increase in revolving credit facility	(46,150		)	—			—			—			(46,150		)
Proceeds on issuance of debt	300,000			37,660			171,300			—			508,960
Retirements and repayments of debt	(401,232		)	(20,928		)	(233,700		)	—			(655,860		)
Purchase of common stock	(184,380		)	—			—			—			(184,380		)
Payments of deferred financing costs	(6,487		)	—			—			—			(6,487		)
Dividends paid	(8,100		)	—			—			—			(8,100		)
Proceeds from governmental grant	—			(3,198		)	—			—			(3,198		)
Repurchase of restricted shares for minimum tax obligation	(673		)	—			—			—			(673		)
Proceeds from exercise of stock options, including excess tax benefit	720			—			—			—			720
Intercompany financing and advances	355,969			(521,180		)	176,124			(10,913		)	—
Net cash provided by (used in) financing activities	9,667			(507,646		)	113,724			(10,913		)	(395,168		)
Effect of exchange rate changes on cash and cash equivalents	—			—			(642		)	—			(642		)
Net change in cash and cash equivalents	(2,200		)	(730		)	6,549			—			3,619
Cash and cash equivalents at beginning of year	2,820			1,149			25,029			—			28,998
Cash and cash equivalents at end of year	$	620		$	419		$	31,578		$	—		$	32,617
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS:
	Fiscal year ended March 31, 2014
	Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
				Subsidiaries			Subsidiaries						Total
Net income	$	67,889		$	133,601		$	4,766		$	—		$	206,256
Adjustments to reconcile net income to net cash provided by (used in) operating activities	108,816			(170,631		)	(3,502		)	(5,802		)	(71,119		)
Net cash provided by (used in) operating activities	176,705			(37,030		)	1,264			(5,802		)	135,137
Capital expenditures	(2,381		)	(185,794		)	(18,239		)	—			(206,414		)
Reimbursements of capital expenditures	—			9,086			—			—			9,086
Proceeds from sale of assets and businesses	—			45,038			9			—			45,047
Cash used for businesses and intangible assets acquired	—			(6,505		)	(87,951		)	—			(94,456		)
Net cash used in investing activities	(2,381		)	(138,175		)	(106,181		)	—			(246,737		)
Net increase in revolving credit facility	98,557			—			—			—			98,557
Proceeds on issuance of debt	375,000			30,503			45,500			—			451,003
Retirements and repayments of debt	(271,812		)	(27,218		)	(117,615		)	—			(416,645		)
Purchase of common stock	(19,134		)	—			—			—			(19,134		)
Payments of deferred financing costs	(3,297		)	—			—			—			(3,297		)
Dividends paid	(8,344		)	—			—			—			(8,344		)
Repayment of governmental grant	—			3,456			—			—			3,456
Repurchase of restricted shares for minimum tax obligation	(2,726		)	—			—			—			(2,726		)
Proceeds from exercise of stock options, including excess tax benefit	329			—			—			—			329
Intercompany financing and advances	(343,187		)	168,076			169,309			5,802			—
Net cash (used in) provided by financing activities	(174,614		)	174,817			97,194			5,802			103,199
Effect of exchange rate changes on cash and cash equivalents	—			—			5,362			—			5,362
Net change in cash and cash equivalents	(290		)	(388		)	(2,361		)	—			(3,039		)
Cash and cash equivalents at beginning of year	3,110			1,537			27,390			—			32,037
Cash and cash equivalents at end of year	$	2,820		$	1,149		$	25,029		$	—		$	28,998
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS:
	Fiscal year ended March 31, 2013
	Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
				Subsidiaries			Subsidiaries						Total
Net income	$	58,252		$	229,562		$	9,533		$	—		$	297,347
Adjustments to reconcile net income to net cash provided by operating activities	42,111			4,046			(22,586		)	—			23,571
Net cash provided by (used in) operating activities	100,363			233,608			(13,053		)	—			320,918
Capital expenditures	(1,315		)	(119,949		)	(5,626		)	—			(126,890		)
Reimbursements of capital expenditures	—			5,156			—			—			5,156
Proceeds from sale of assets and businesses	—			3,985			8			—			3,993
Cash used for businesses and intangible assets acquired	—			(349,632		)	—			—			(349,632		)
Net cash used in investing activities	(1,315		)	(460,440		)	(5,618		)	—			(467,373		)
Net decrease in revolving credit facility	(224,151		)	—			—			—			(224,151		)
Proceeds on issuance of debt	375,000			14,435			138,700			—			528,135
Retirements and repayments of debt	(19,594		)	(14,044		)	(108,700		)	—			(142,338		)
Payments of deferred financing costs	(8,838		)	—			—			—			(8,838		)
Dividends paid	(8,005		)	—			—			—			(8,005		)
Repayment of governmental grant	—			(1,090		)	—			—			(1,090		)
Repurchase of restricted shares for minimum tax obligation	(1,840		)	—			—			—			(1,840		)
Proceeds from exercise of stock options, including excess tax benefit	6,766			—			—			—			6,766
Intercompany financing and advances	(223,245		)	226,831			(3,586		)	—			—
Net cash (used in) provided by financing activities	(103,907		)	226,132			26,414			—			148,639
Effect of exchange rate changes on cash and cash equivalents	—			—			191			—			191
Net change in cash and cash equivalents	(4,859		)	(700		)	7,934			—			2,375
Cash and cash equivalents at beginning of year	7,969			2,237			19,456			—			29,662
Cash and cash equivalents at end of year	$	3,110		$	1,537		$	27,390		$	—		$	32,037

QUARTERLY_FINANCIAL_INFORMATIO

QUARTERLY FINANCIAL INFORMATION (Unaudited)	12 Months Ended
	Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information [Text Block]	QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
		Fiscal 2015												Fiscal 2014
		June 30 (6) (7)			Sept. 30			Dec. 31 (8) (9)			Mar. 31			June 30 (4)			Sept. 30			Dec. 31 (5)			Mar. 31
	BUSINESS SEGMENT SALES
	Aerostructures	$	611,863		$	632,072		$	559,465		$	704,478		$	651,888		$	690,748		$	637,202		$	632,601
	Aerospace Systems	219,852			288,902			279,198			301,165			219,526			205,483			211,402			235,339
	Aftermarket Services	67,608			74,343			80,690			81,372			74,353			72,971			69,556			70,463
	Inter-segment Elimination	(2,418		)	(1,194		)	(1,936		)	(6,738		)	(2,084		)	(1,857		)	(2,344		)	(1,993		)
	TOTAL SALES	$	896,905		$	994,123		$	917,417		$	1,080,277		$	943,683		$	967,345		$	915,816		$	936,410
	GROSS PROFIT(1)	$	188,112		$	197,566		$	24,068		$	237,071		$	222,303		$	171,143		$	166,518		$	182,243
	OPERATING INCOME
	Aerostructures	$	70,866		$	72,230		$	(102,461	)	$	86,861		$	100,387		$	64,425		$	52,412		$	35,686
	Aerospace Systems	37,352			46,214			41,863			58,612			42,643			31,740			32,504			42,834
	Aftermarket Services	10,504			11,620			12,490			13,317			11,279			10,102			9,297			11,587
	Corporate	121,802			(15,366		)	(13,158		)	(18,073		)	(12,963		)	(13,296		)	(9,434		)	(9,199		)
	TOTAL OPERATING INCOME	$	240,524		$	114,698		$	(61,266	)	$	140,717		$	141,346		$	92,971		84,779			$	80,908
	NET INCOME	$	128,243		$	67,446		$	(39,832	)	$	82,840		$	79,043		$	49,516		35,393			$	42,304
	Basic Earnings (Loss) per share(2)	$	2.48		$	1.32		$	(0.79	)	$	1.66		$	1.56		$	0.96		$	0.68		$	0.81
	Diluted Earnings (Loss) per share(2)(3)	$	2.46		$	1.32		$	(0.79	)	$	1.66		$	1.5		$	0.94		$	0.67		$	0.8
	*	Difference due to rounding.
	-1	Gross profit includes depreciation.
	-2	The sum of the earnings for Continuing Operations and Discontinued Operations does not necessarily equal the earnings for the quarter due to rounding.
	-3	The sum of the diluted earnings per share for the four quarters does not necessarily equal the total year diluted earnings per share due to the dilutive effect of the potential common shares related to the convertible debt.
	-4	Includes the results of Primus from May 6, 2013 (date of acquisition) through March 31, 2014.
	-5	Includes the results of General Donlee from October 4, 2013 (date of acquisition) through March 31, 2014.
	-6	Includes the results of GE from June 27, 2014 (date of acquisition) through March 31, 2015.
	-7	Includes the Gain on Legal Settlement, net ($134,693).
	-8	Includes the results of NAAS from October 17, 2014 (date of acquisition) through March 31, 2015.
	-9	Includes the results of Tulsa Programs from December 30, 2014 (date of acquisition) through March 31, 2015 and a provision for forward losses of approximately $151,992 associated with our long-term contract on the 747-8 program.

Valuation_and_Qualifying_Accou

Valuation and Qualifying Accounts	12 Months Ended
	Mar. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
		Balance at		Additions	Additions(1)	(Deductions)(2)		Balance at
		beginning of		charged to				end of year
		year		expense
	For year ended March 31, 2015:
	Allowance for doubtful accounts receivable	$	6,535	171	85	(316	)	$	6,475
	For year ended March 31, 2014:
	Allowance for doubtful accounts receivable	$	5,372	2,191	6	(1,034	)	$	6,535
	For year ended March 31, 2013:
	Allowance for doubtful accounts receivable	$	3,900	1,974	70	(572	)	$	5,372

SUMMARY_OF_SIGNIFICANT_ACCOUNT1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Mar. 31, 2015							Mar. 31, 2014
Accounting Policies [Abstract]
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash Equivalents
	Cash equivalents consist of highly liquid investments with a maturity of three months or less at the time of purchase. Fair value of cash equivalents approximates carrying value.
Receivables, Policy [Policy Text Block]	Trade and Other Receivables, net
	Trade and other receivables are recorded net of an allowance for doubtful accounts. Trade and other receivables include amounts billed and currently due from customers, amounts currently due but unbilled, certain estimated contract changes and amounts retained by the customer pending contract completion. Unbilled amounts are generally billed and collected within one year. The Company performs ongoing credit evaluations of its customers and generally does not require collateral. The Company records the allowance for doubtful accounts based on prior experience and for specific collectibility matters when they arise. The Company writes off balances against the reserve when collectibility is deemed remote. The Company's trade and other receivables are exposed to credit risk; however, the risk is limited due to the diversity of the customer base.
	Trade and other receivables, net comprised of the following:
		March 31,
		2015			2014
	Billed	$	475,913		$	487,344
	Unbilled	39,222			12,333
	Total trade receivables	515,135			499,677
	Other receivables	13,186			24,162
	Total trade and other receivables	528,321			523,839
	Less: Allowance for doubtful accounts	(6,475		)	(6,535		)
	Total trade and other receivables, net	$	521,846		$	517,304
Inventory, Policy [Policy Text Block]	Inventories
	The Company records inventories at the lower of cost (average-cost or specific-identification methods) or market. Costs on long-term contracts and programs in progress represent recoverable costs incurred for production or contract-specific facilities and equipment, allocable operating overhead and advances to suppliers. Pursuant to contract provisions, agencies of the U.S. Government and certain other customers have title to, or a security interest in, inventories related to such contracts as a result of advances, performance-based payments, and progress payments. The Company reflects those advances and payments as an offset against the related inventory balances. The Company expenses general and administrative costs related to products and services provided essentially under commercial terms and conditions as incurred. The Company determines the costs of inventories by the first-in, first-out or average cost methods.
	Work-in-process inventory includes capitalized pre-production costs. Company policy allows for the capitalization of pre-production costs after it establishes a contractual arrangement with a customer that explicitly states that the cost of recovery of pre-production costs is allowed.
Customer Advances and Progress Payments for Long-term Contracts or Programs [Policy Text Block]	Advance Payments and Progress Payments
	Advance payments and progress payments received on contracts-in-process are first offset against related contract costs that are included in inventory, with any excess amount reflected in current liabilities under the Accrued expenses caption within the accompanying Consolidated Balance Sheets.
Property, Plant and Equipment, Policy [Policy Text Block]	Property and Equipment
	Property and equipment, which includes equipment under capital lease and leasehold improvements, are recorded at cost and depreciated over the estimated useful lives of the related assets, or the lease term if shorter in the case of leasehold improvements, by the straight-line method. Buildings and improvements are depreciated over a period of 15 to 39.5 years, and machinery and equipment are depreciated over a period of 7 to 15 years (except for furniture, fixtures and computer equipment which are depreciated over a period of 3 to 10 years).
Goodwill and Intangible Assets, Policy [Policy Text Block]	Goodwill and Intangible Assets
	The Company accounts for purchased goodwill and intangible assets in accordance with Accounting Standards Codification ("ASC") 350, Intangibles—Goodwill and Other. Under ASC 350, purchased goodwill and intangible assets with indefinite lives are not amortized; rather, they are tested for impairment on at least an annual basis. Intangible assets with finite lives are amortized over their useful lives. Upon acquisition, critical estimates are made in valuing acquired intangible assets, which include but are not limited to: future expected cash flows from customer contracts, customer lists, and estimating cash flows from projects when completed; tradename and market position, as well as assumptions about the period of time that customer relationships will continue; and discount rates. Management's estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from the assumptions used in determining the fair values.
	The Company's operating segments of Aerostructures, Aerospace Systems and Aftermarket Services are also its reporting units. The Chief Executive Officer and the Chief Financial Officer comprise the Company's Chief Operating Decision Maker ("CODM"). The Company's CODM evaluates performance and allocates resources based upon review of segment information. Each of the operating segments is comprised of a number of operating units which are considered to be components. The components, for which discrete financial information exists, are aggregated for purposes of goodwill impairment testing. The Company's acquisition strategy is to acquire companies that complement and enhance the capabilities of the operating segments of the Company. Each acquisition is assigned to either the Aerostructures reporting unit, the Aerospace Systems reporting unit or the Aftermarket Services reporting unit. The goodwill that results from each acquisition is also assigned to the reporting unit to which the acquisition is allocated, because it is that reporting unit which is intended to benefit from the synergies of the acquisition.
	The Company assesses whether goodwill impairment exists using both the qualitative and quantitative assessments. The qualitative assessment involves determining whether events or circumstances exist that indicate it is more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill. If based on this qualitative assessment the Company determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount or if the Company elects not to perform a qualitative assessment, a quantitative assessment is performed using a two-step approach required by ASC 350 to determine whether a goodwill impairment exists at the reporting unit.
	The first step of the quantitative test is to compare the carrying amount of the reporting unit's assets to the fair value of the reporting unit. If the fair value exceeds the carrying value, no further work is required and no impairment loss is recognized. If the carrying amount exceeds the fair value, then the second step is required to be completed, which involves allocating the fair value of the reporting unit to each asset and liability, with the excess being applied to goodwill. An impairment loss occurs if the amount of the recorded goodwill exceeds the implied goodwill. The determination of the fair value of our reporting units is based, among other things, on estimates of future operating performance of the reporting unit being valued. We are required to complete an impairment test for goodwill and record any resulting impairment losses at least annually. Changes in market conditions, among other factors, may have an impact on these estimates and require interim impairment assessments.
	When performing the two-step quantitative impairment test, the Company's methodology includes the use of an income approach which discounts future net cash flows to their present value at a rate that reflects the Company's cost of capital, otherwise known as the discounted cash flow method ("DCF"). These estimated fair values are based on estimates of future cash flows of the businesses. Factors affecting these future cash flows include the continued market acceptance of the products and services offered by the businesses, the development of new products and services by the businesses and the underlying cost of development, the future cost structure of the businesses, and future technological changes. The Company also incorporates market multiples for comparable companies in determining the fair value of our reporting units. Any such impairment would be recognized in full in the reporting period in which it has been identified.
	The Company incurred no impairment of goodwill as a result of our annual goodwill impairment tests in fiscal years 2015, 2014 or 2013. In the fourth quarter of fiscal 2015, the Company chose to perform the quantitative assessment, in lieu of the qualitative assessment for each of the Company's three reporting units, which indicated that the fair value of the reporting unit exceeded its carrying amount, including goodwill.
	As of March 31, 2015 and 2014, the Company had a $438,400 indefinite-lived intangible asset associated with the tradenames acquired in the acquisitions of Vought Aircraft Industries, Inc. ("Vought") and Embee, Inc. ("Embee"). The Company assesses whether indefinite-lived intangible assets impairment exists using both the qualitative and quantitative assessments. The qualitative assessment involves determining whether events or circumstances exist that indicate it is more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying amount. If based on this qualitative assessment, the Company determines it is not more likely than not that the fair value of an indefinite-lived intangible asset is less than its carrying amount or if the Company elects not to perform a qualitative assessment, a quantitative assessment is performed to determine whether an indefinite-lived intangible asset impairment exists. We test the indefinite-lived intangible assets for impairment by comparing the carrying value to the fair value based on current revenue projections of the related operations, under the relief from royalty method. Any excess of the carrying value over the amount of fair value is recognized as an impairment.
	The Company incurred no impairment of indefinite-lived intangible assets as a result of our annual indefinite-lived intangible assets impairment tests in fiscal years 2015, 2014 or 2013. In the fourth quarter of fiscal 2015, the Company chose to perform the quantitative assessment, in lieu of the qualitative assessment, for each of the Company's indefinite-lived intangible assets, which indicated that the fair value of the indefinite-lived intangible assets exceeded its carrying amount.
	Finite-lived intangible assets are amortized over their useful lives ranging from 3 to 32 years. The Company continually evaluates whether events or circumstances have occurred that would indicate that the remaining estimated useful lives of long-lived assets, including intangible assets, may warrant revision or that the remaining balance may not be recoverable. Intangible assets are evaluated for indicators of impairment. When factors indicate that long-lived assets, including intangible assets, should be evaluated for possible impairment, an estimate of the related undiscounted cash flows over the remaining life of the long-lived assets, including intangible assets, is used to measure recoverability. Some of the more important factors management considers include the Company's financial performance relative to expected and historical performance, significant changes in the way the Company manages its operations, negative events that have occurred, and negative industry and economic trends. If the carrying amount is less than the estimated fair value, measurement of the impairment will be based on the difference between the carrying value and fair value of the asset group, generally determined based on the present value of expected future cash flows associated with the use of the asset.
Deferred Charges, Policy [Policy Text Block]	Deferred Financing Costs
	Financing costs are deferred and amortized to Interest expense and other in the accompanying Consolidated Statements of Income over the related financing period using the effective interest method or the straight-line method when it does not differ materially from the effective interest method. Deferred financing costs, net of accumulated amortization of $17,850 and $19,499, respectively, are recorded in Other, net in the accompanying Consolidated Balance Sheets as of March 31, 2015 and 2014. Make-whole payments in connection with early debt retirements are classified as cash flows used in financing activities.
Acquired Contract Liabilities, net [Policy Text Block]	Acquired Contract Liabilities, net
	In connection with several of our acquisitions, we assumed existing long-term contracts. Based on our review of these contracts, we concluded that the terms of certain contracts to be either more or less favorable than could be realized in market transactions as of the date of the acquisition. As a result, we recognized acquired contract liabilities, net of acquired contract assets as of the acquisition date of each respective acquisition, based on the present value of the difference between the contractual cash flows of the executory contracts and the estimated cash flows had the contracts been executed at the acquisition date. The liabilities principally relate to long-term life of program contracts that were initially executed at several years prior to the respective acquisition (see Note 3 of "Notes to Consolidated Financial Statements" for further discussion).
	The Company measured these net liabilities under the measurement provisions of ASC 820, Fair Value Measurements and Disclosures, which is based on the price to transfer the obligation to a market participant at the measurement date, assuming that the net liabilities will remain outstanding in the marketplace. Fair value estimates are based on a complex series of judgments about future events and uncertainties and rely heavily on estimates and assumptions. The judgments used to determine the estimated fair value assigned to each long-term contracts can materially impact our results of operations.
	Included in the net sales of the Aerostructure and Aerospace Systems group is the non-cash amortization of acquired contract liabilities recognized as fair value adjustments through purchase accounting from various acquisitions. The Company recognized net amortization of contract liabilities of $75,733, $42,629 and $25,644 in the fiscal years ended March 31, 2015, 2014 and 2013, respectively, and such amounts have been included in revenues in results of operations. The balance of the liability as of March 31, 2015 is $644,950 and, based on the expected delivery schedule of the underlying contracts, the Company estimates annual amortization of the liability as follows: 2016—$130,087; 2017—$127,003; 2018—$119,207; 2019—$115,550; and 2020—$69,090.
Revenue Recognition	Revenue Recognition
	Revenues are generally recognized in accordance with the contract terms when products are shipped, delivery has occurred or services have been rendered, pricing is fixed or determinable, and collection is reasonably assured. The Company's policy with respect to sales returns and allowances generally provides that the customer may not return products or be given allowances, except at the Company's option. Accruals for sales returns, other allowances and estimated warranty costs are provided at the time of shipment based upon past experience.
	A significant portion of the Company's contracts are within the scope of ASC 605-35, Revenue—Construction-Type and Production-Type Contracts, and revenue and costs on contracts are recognized using the percentage-of-completion method of accounting. Accounting for the revenue and profit on a contract requires estimates of (1) the contract value or total contract revenue, (2) the total costs at completion, which is equal to the sum of the actual incurred costs to date on the contract and the estimated costs to complete the contract's scope of work and (3) the measurement of progress towards completion. Depending on the contract, the Company measures progress toward completion using either the cost-to-cost method or the units-of-delivery method, with the great majority measured under the units-of-delivery method.
	•	Under the cost-to-cost method, progress toward completion is measured as the ratio of total costs incurred to estimated total costs at completion. Costs are recognized as incurred. Profit is determined based on estimated profit margin on the contract multiplied by progress toward completion. Revenue represents the sum of costs and profit on the contract for the period.
	•	Under the units-of-delivery method, revenue on a contract is recorded as the units are delivered and accepted during the period at an amount equal to the contractual selling price of those units. The costs recorded on a contract under the units-of-delivery method are equal to the total costs at completion divided by the total units to be delivered. As contracts can span multiple years, the Company often segments the contracts into production lots for the purposes of accumulating and allocating cost. Profit is recognized as the difference between revenue for the units delivered and the estimated costs for the units delivered.
	Adjustments to original estimates for a contract's revenues, estimated costs at completion and estimated total profit are often required as work progresses under a contract, as experience is gained and as more information is obtained, even though the scope of work required under the contract may not change, or if contract modifications occur. These estimates are also sensitive to the assumed rate of production. Generally, the longer it takes to complete the contract quantity, the more relative overhead that contract will absorb. The impact of revisions in cost estimates is recognized on a cumulative catch-up basis in the period in which the revisions are made. Provisions for anticipated losses on contracts are recorded in the period in which they become probable ("forward losses") and are first offset against costs that are included in inventory, with any remaining amount reflected in accrued contract liabilities in accordance with ASC 605-35. Revisions in contract estimates, if significant, can materially affect results of operations and cash flows, as well as valuation of inventory. Furthermore, certain contracts are combined or segmented for revenue recognition in accordance with ASC 605-35.
	For the fiscal year ended March 31, 2015, cumulative catch-up adjustments resulting from changes in contract values and estimated costs that arose during the fiscal year decreased operating income, net income and earnings per share by approximately $(156,048), $(106,639) and $(2.09), respectively. The cumulative catch-up adjustments to operating income for the fiscal year ended March 31, 2015 included gross favorable adjustments of approximately $4,653 and gross unfavorable adjustments of approximately $(160,701), which includes a provision for forward losses of $151,992, as discussed below in greater detail. For the fiscal year ended March 31, 2014, cumulative catch-up adjustments resulting from changes in estimates decreased operating income, net income and earnings per share by approximately $(53,166), $(35,121) and $(0.67), respectively. The cumulative catch-up adjustments to operating income for the fiscal year ended March 31, 2014 included gross favorable adjustments of approximately $14,341 and gross unfavorable adjustments of approximately $(67,507). For the fiscal year ended March 31, 2013, cumulative catch-up adjustments resulting from changes in estimates decreased operating income, net income and earnings per share by approximately $(14,560) $(9,350) and $(0.18), respectively. The cumulative catch-up adjustments to operating income for the fiscal year ended March 31, 2013 included gross favorable adjustments of approximately $15,913 and gross unfavorable adjustments of approximately $(30,473).
	Amounts representing contract change orders or claims are only included in revenue when such change orders or claims have been settled with the customer and to the extent that units have been delivered. Additionally, some contracts may contain provisions for revenue sharing, price re-determination, requests for equitable adjustments, change orders or cost and/or performance incentives. Such amounts or incentives are included in contract value when the amounts can be reliably estimated and their realization is reasonably assured.
	Although fixed-price contracts, which extend several years into the future, generally permit the Company to keep unexpected profits if costs are less than projected, the Company also bears the risk that increased or unexpected costs may reduce profit or cause the Company to sustain losses on the contract. In a fixed-price contract, the Company must fully absorb cost overruns, notwithstanding the difficulty of estimating all of the costs the Company will incur in performing these contracts and in projecting the ultimate level of revenue that may otherwise be achieved.
	During the third quarter of the fiscal year ended March 31, 2015, the Company recognized a provision for forward losses of $151,992 associated with the Company's long-term contract on the 747-8 program. These forward losses are largely due to changes in future estimated production rates, labor and overhead costs, pension income and expedited delivery charges.
	•	In December 2014, our customer, The Boeing Company (“Boeing”), announced a future production rate reduction for the 747-8 program from 1.5 shipsets per month to 1.3 shipsets per month. This production rate cut will result in additional future disruption and overhead cost absorption across our related production facilities.
	•	While the Company has experienced improvements in labor performance metrics on our work associated with the 747-8 program in recent quarters, the Company has not recovered to the levels previously experienced or as quickly as expected, and no longer believes that the Company can recover to the level required to avoid future losses. The Company's increased labor assumptions will also result in increased overhead cost absorption to the 747-8 program.
	•	In October 2014, the Society of Actuaries released updated mortality tables to reflect recent improvements in longevity. The mortality tables are a key assumption in the valuation of our defined benefit obligations and related net period pension benefit income. These new mortality tables will lower estimated future pension benefit income amounts, thereby negatively impacting our future cost estimates associated with the 747-8 program.
	•	Although the Company has made improvements on the quality and timeliness of deliveries as compared to the prior year, the Company continues to incur charges related to expedited delivery and have included estimates for additional costs in the future.
	While the Company has recently recognized a provision for forward losses, there is still risk similar in nature to what the Company has experienced on the 747-8 program. In particular, the Company's ability to manage risks related to supplier performance, execution of cost reduction strategies, hiring and retaining skilled production and management personnel, quality and manufacturing execution, program schedule delays and many other risks, will determine the ultimate performance of these programs.
	The Aftermarket Services Group provides repair and overhaul services, certain of which services are provided under long-term power-by-the-hour contracts, comprising approximately 7% of the segment's net sales. The Company applies the proportional performance method to recognize revenue under these contracts. Revenue is recognized over the contract period as units are delivered based on the relative value in proportion to the total estimated contract consideration. In estimating the total contract consideration, management evaluates the projected utilization of its customer's fleet over the term of the contract, in connection with the related estimated repair and overhaul servicing requirements to the fleet based on such utilization. Changes in utilization of the fleet by customers, among other factors, may have an impact on these estimates and require adjustments to estimates of revenue to be realized
Shipping and Handling Cost, Policy [Policy Text Block]								Shipping and Handling Costs
								The cost of shipping and handling products is included in cost of products sold
Research and Development Expense, Policy [Policy Text Block]	Research and Development Expense
	Research and development expense (which includes certain amounts subject to reimbursement from customers) was approximately $81,205, $61,657 and $61,270 for the fiscal years ended March 31, 2015, 2014 and 2013, respectively
Pension and Other Postretirement Plans, Nonpension Benefits, Policy [Policy Text Block]	Retirement Benefits
	Defined benefit pension plans are recognized in the consolidated financial statements on an actuarial basis. A significant element in determining the Company's pension income (expense) is the expected long-term rate of return on plan assets. This expected return is an assumption as to the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the projected pension benefit obligation. The Company applies this assumed long-term rate of return to a calculated value of plan assets, which recognizes changes in the fair value of plan assets in a systematic manner over five years. This produces the expected return on plan assets that is included in pension income (expense). The difference between this expected return and the actual return on plan assets is deferred. The net deferral of past asset gains (losses) affects the calculated value of plan assets and, ultimately, future pension income (expense).
	The Company periodically experiences events or makes changes to its benefit plans that result in curtailment or special charges. Curtailments are recognized when events occur that significantly reduce the expected years of future service of present employees or eliminates the benefits for a significant number of employees for some or all of their future service.
	Curtailment losses are recognized when it is probable the curtailment will occur and the effects are reasonably estimable. Curtailment gains are recognized when the related employees are terminated or a plan amendment is adopted, whichever is applicable.
	As required under ASC 715, Compensation - Retirement Benefits, the Company remeasures plan assets and obligations during an interim period whenever a significant event occurs that results in a material change in the net periodic pension cost. The determination of significance is based on judgment and consideration of events and circumstances impacting the pension costs.
	At March 31 of each year, the Company determines the fair value of its pension plan assets as well as the discount rate to be used to calculate the present value of plan liabilities. The discount rate is an estimate of the interest rate at which the pension benefits could be effectively settled. In estimating the discount rate, the Company looks to rates of return on high-quality, fixed-income investments currently available and expected to be available during the period to maturity of the pension benefits. The Company uses a portfolio of fixed-income securities, which receive at least the second-highest rating given by a recognized ratings agency
Fair Value of Financial Instruments, Policy [Policy Text Block]	Fair Value Measurements
	Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. When determining fair value measurements for assets and liabilities required to be recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and also considers assumptions that market participants would use when pricing an asset or liability. The fair value hierarchy has three levels of inputs that may be used to measure fair value: Level 1—Unadjusted quoted prices in active markets for identical assets or liabilities; Level 2—Unadjusted quoted prices in active markets for similar assets or liabilities, or unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs other than quoted prices that are observable for the asset or liability; and Level 3—Unobservable inputs for the asset or liability. The Company has applied fair value measurements to its interest rate swap (see Note 10) and to its pension and postretirement plan assets (see Note 15)
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency Translation
	The determination of the functional currency for the Company's foreign subsidiaries is made based on appropriate economic factors. The functional currency of the Company's subsidiaries Triumph Aviation Services—Asia and Triumph Structures—Thailand is the U.S. dollar since that is the currency in which that entity primarily generates and expends cash. The functional currency of the Company's remaining subsidiaries is the local currency, since that is the currency in which those entities primarily generate and expend cash. Assets and liabilities of these subsidiaries are translated at the rates of exchange at the balance sheet date. Income and expense items are translated at average monthly rates of exchange. The resultant translation adjustments are included in accumulated other comprehensive income (see Note 13). Gains and losses arising from foreign currency transactions of these subsidiaries are included in net income
Income Tax, Policy [Policy Text Block]	Income Taxes
	The Company accounts for income taxes using the asset and liability method. The asset and liability method requires recognition of deferred tax assets and liabilities for expected future tax consequences of temporary differences that currently exist between tax bases and financial reporting bases of the Company's assets and liabilities. A valuation allowance is provided on deferred taxes if it is determined that it is more likely than not that the asset will not be realized. The Company recognizes penalties and interest accrued related to income tax liabilities in the provision for income taxes in its consolidated statements of income
Description of New Accounting Pronouncements Not yet Adopted [Text Block]	Recently Issued Accounting Pronouncements
Stock-Based Compensation	Stock-Based Compensation
	The Company recognizes compensation expense for share-based awards based on the fair value of those awards at the date of grant. Stock-based compensation expense for fiscal years ended March 31, 2015, 2014 and 2013 was $1,272, $4,653 and $6,367, respectively. The benefits of tax deductions in excess of recognized compensation expense were $39 and $4,628 for fiscal years ended March 31, 2014 and 2013, respectively. The Company has classified share-based compensation within selling, general and administrative expenses to correspond with the same line item as the majority of the cash compensation paid to employees. Upon the exercise of stock options or vesting of restricted stock, the Company first transfers treasury stock, then will issue new shares. (see Note 16 for further details).
Cash Flow, Supplemental Disclosures [Text Block]	Supplemental Cash Flow Information
	For the fiscal year ended March 31, 2015, the Company received $22,241 for income tax refunds, net of payments. For the fiscal years ended March 31, 2014 and 2013, Company paid $4,157 and $3,109, respectively, for income taxes, net of income tax refunds received. The Company made interest payments of $82,425, $81,100 and $62,229 for fiscal years ended March 31, 2015, 2014 and 2013.
	During the fiscal years ended March 31, 2015, 2014 and 2013, the Company financed $52, $36 and $66 of property and equipment additions through capital leases, respectively. During the fiscal years ended March 31, 2014 and 2013, the Company issued 2,290,755 and 395,269 shares, respectively, in connection with certain redemptions of convertible senior subordinated notes (see Note 10).
Standard Product Warranty, Policy [Policy Text Block]	Warranty Reserves
	A reserve has been established to provide for the estimated future cost of warranties on our delivered products. The Company periodically reviews the reserves and adjustments are made accordingly. A provision for warranty on products delivered is made on the basis of historical experience and identified warranty issues. Warranties cover such factors as non-conformance to specifications and defects in material and workmanship. The majority of the Company's agreements include a three-year warranty, although certain programs have warranties up to 20 years. Warranty reserves are included in accrued expenses and other noncurrent liabilities. The warranty reserves for the fiscal years ended March 31, 2015 and 2014 were $78,972 and $25,651, respectively. This increase is primarily due to acquisitions (see Note 3).

SUMMARY_OF_SIGNIFICANT_ACCOUNT2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES ACCOUNTS RECEIVABLE (Policies)	12 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
		March 31,
		2015			2014
	Billed	$	475,913		$	487,344
	Unbilled	39,222			12,333
	Total trade receivables	515,135			499,677
	Other receivables	13,186			24,162
	Total trade and other receivables	528,321			523,839
	Less: Allowance for doubtful accounts	(6,475		)	(6,535		)
	Total trade and other receivables, net	$	521,846		$	517,304

PROPERTY_AND_EQUIPMENT_PROPERT

PROPERTY AND EQUIPMENT PROPERTY AND EQUIPMENT (Policies)	12 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Policy [Policy Text Block]	Property and Equipment
	Property and equipment, which includes equipment under capital lease and leasehold improvements, are recorded at cost and depreciated over the estimated useful lives of the related assets, or the lease term if shorter in the case of leasehold improvements, by the straight-line method. Buildings and improvements are depreciated over a period of 15 to 39.5 years, and machinery and equipment are depreciated over a period of 7 to 15 years (except for furniture, fixtures and computer equipment which are depreciated over a period of 3 to 10 years).

INCOME_TAXES_INCOME_TAXES_Poli

INCOME TAXES INCOME TAXES (Policies)	12 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Tax, Policy [Policy Text Block]	Income Taxes
	The Company accounts for income taxes using the asset and liability method. The asset and liability method requires recognition of deferred tax assets and liabilities for expected future tax consequences of temporary differences that currently exist between tax bases and financial reporting bases of the Company's assets and liabilities. A valuation allowance is provided on deferred taxes if it is determined that it is more likely than not that the asset will not be realized. The Company recognizes penalties and interest accrued related to income tax liabilities in the provision for income taxes in its consolidated statements of income

SUMMARY_OF_SIGNIFICANT_ACCOUNT3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
		March 31,
		2015			2014
	Billed	$	475,913		$	487,344
	Unbilled	39,222			12,333
	Total trade receivables	515,135			499,677
	Other receivables	13,186			24,162
	Total trade and other receivables	528,321			523,839
	Less: Allowance for doubtful accounts	(6,475		)	(6,535		)
	Total trade and other receivables, net	$	521,846		$	517,304

ACQUISITIONS_Tables

ACQUISITIONS (Tables) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015						Mar. 31, 2014
Acquisitions
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$307,558
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]
Schedule of pro forma impact of the Vought acquisition	"
	The following table presents information for the fiscal 2015 acquisitions which are included in the Company's Consolidated Statement of Income from their respective dates of acquisitions through the end of fiscal 2015:
			For the Year Ended March 31, 2015
	Net sales		$	307,558
	Operating income		41,679
Tulsa Programs [Member]
Acquisitions
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	Accordingly, the amounts below report the Company's best estimate of fair value based on the information available at this time:
		December 30, 2014
	Accounts receivable	$	4,929
	Inventory	72,363
	Property and equipment	14,781
	Goodwill	74,837
	Deferred taxes	53,131
	Other noncurrent assets	18,161
	Total assets	$	238,202
	Accrued expenses	$	17,227
	Acquired contract liabilities	358,735
	Other noncurrent liabilities	22,240
	Total liabilities	$	398,202
General Donlee [Member]
Acquisitions
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
		4-Oct-13
	Accounts receivable	$	10,573
	Inventory	15,645
	Prepaid expenses and other	184
	Property and equipment	31,952
	Goodwill	46,528
	Intangible assets	24,596
	Total assets	$	129,478
	Accounts payable	$	2,841
	Accrued expenses	3,620
	Deferred taxes	11,439
	Debt	54,956
	Total liabilities	$	72,856
Fiscal 2014 Acquisitions [Member]
Acquisitions
Schedule of pro forma impact of the Vought acquisition
			(unaudited) Year Ended March 31,
			2015		2014
	Net sales		$	3,939,659	$	3,991,532
	Net income		240,746		207,142
	Net income, per share—basic		$	4.74	$	4.01
	Net income, per share—diluted		$	4.72	$	3.92
Goodrich Pump & Engine Controls Systems [Member]
Acquisitions
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Embee Incorporated [Member]
Acquisitions
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]
NAAS [Member]
Acquisitions
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	Accordingly, the amounts below report the Company's best estimate of fair value based on the information available at this time:
		October 17, 2014
	Cash	$	803
	Accounts receivable	4,974
	Inventory	866
	Property and equipment	216
	Goodwill	25,159
	Intangible assets	17,000
	Other assets	280
	Total assets	$	49,298
	Accounts payable	$	232
	Accrued expenses	935
	Other noncurrent liabilities	3,611
	Total liabilities	$	4,778
GE [Member]
Acquisitions
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	Accordingly, the amounts below report the Company's best estimate of fair value based on the information available at this time:
		June 27, 2014
	Cash	$	4,608
	Accounts receivable	35,582
	Inventory	48,469
	Property and equipment	29,781
	Goodwill	161,160
	Intangible assets	32,496
	Deferred taxes	62,731
	Other assets	2,023
	Total assets	$	376,850
	Accounts payable	$	17,830
	Accrued expenses	52,935
	Acquired contract liabilities	230,476
	Total liabilities	$	301,241

INVENTORIES_Tables

INVENTORIES (Tables)	12 Months Ended
	Mar. 31, 2015
Inventory [Line Items]
Preproduction Costs Related to Long-Term Supply Arrangements, Costs Capitalized [Table Text Block]	The balance of capitalized pre-production costs related to the Company's contracts with Bombardier for the Global 7000/8000 program ("Bombardier") and Embraer for the second generation E-Jet ("Embraer") are as follows:
		March 31,
		2015			2014
	Bombardier	$	238,871		$	111,906
	Embraer	68,112			19,452
	Total	$	306,983		$	131,358
Schedule of components of inventories
		March 31,
		2015			2014
	Raw materials	$	79,786		$	106,552
	Work-in-process	1,291,377			1,102,626
	Finished goods	91,639			67,608
	Less: unliquidated progress payments	(189,923		)	(165,019		)
	Total inventories	$	1,272,879		$	1,111,767

PROPERTY_AND_EQUIPMENT_PROPERT1

PROPERTY AND EQUIPMENT PROPERTY AND EQUIPMENT (Tables)	12 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Table Text Block]
		March 31,
		2015		2014
	Land	$	72,893	$	74,835
	Construction in process	53,475		68,904
	Buildings and improvements	374,763		353,096
	Furniture, fixtures and computer equipment	146,834		135,986
	Machinery and equipment	945,317		841,441
		1,593,282		1,474,262
	Less accumulated depreciation	644,380		542,832
		$	948,902	$	931,430

GOODWILL_AND_OTHER_INTANGIBLE_1

GOODWILL AND OTHER INTANGIBLE ASSETS Schedule of Finitie-Lived and Indefinite Lived Intangibles (Tables)	12 Months Ended
	Mar. 31, 2015									Mar. 31, 2014
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Table Text Block]
		March 31, 2015									March 31, 2014
		Weighted-	Gross Carrying		Accumulated			Net			Weighted-	Gross Carrying		Accumulated			Net
		Average Life (in Years)	Amount		Amortization						Average Life (in Years)	Amount		Amortization
	Customer relationships	16.5	$	689,179	$	(180,765	)	$	508,414	Customer relationships	16.7	$	650,199	$	(136,970	)	$	513,229
	Product rights, technology and licenses	11.8	56,419		(33,208		)	23,211		Product rights, technology and licenses	11.7	52,405		(28,437		)	23,968
	Noncompete agreements and other	15.8	2,929		(565		)	2,364		Noncompete agreements and other	13.6	3,679		(1,105		)	2,574
	Tradenames	Indefinite-lived	438,400		—			438,400		Tradenames	Indefinite-lived	438,400		—			438,400
	Total intangibles, net		$	1,186,927	$	(214,538	)	$	972,389	Total intangibles, net		$	1,144,683	$	(166,512	)	$	978,171

GOODWILL_Tables

GOODWILL (Tables)	12 Months Ended
	Mar. 31, 2015											Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of changes in the carrying value of goodwill by reportable segment
		Aerostructures		Aerospace			Aftermarket		Total				Aerostructures			Aerospace		Aftermarket		Total
				Systems			Services									Systems		Services
	Balance, March 31, 2014	$	1,339,993	$	395,912		$	55,986	$	1,791,891		Balance, March 31, 2013	$	1,316,450		$	349,284	$	55,986	$	1,721,720
	Goodwill recognized in connection with acquisitions	74,837		161,160			25,159		261,156			Goodwill recognized in connection with acquisitions	33,798			46,468		—		80,266
	Effect of exchange rate changes	870		(23,431		)	108		(22,453		)	Goodwill associated with disposition	(10,123		)	—		—		(10,123		)
	Balance, March 31, 2015	$	1,415,700	$	533,641		$	81,253	$	2,030,594		Purchase accounting adjustments	33			—		—		33
												Effect of exchange rate changes	(165		)	160		—		(5		)
												Balance, March 31, 2014	$	1,339,993		$	395,912	$	55,986	$	1,791,891

ACCRUED_EXPENSES_ACCRUED_EXPEN

ACCRUED EXPENSES ACCRUED EXPENSES (Tables)	12 Months Ended
	Mar. 31, 2015
Accrued Liabilities [Abstract]
Schedule of Accrued Liabilities [Table Text Block]
		March 31,
		2015		2014
	Accrued pension	$	3,940	$	3,960
	Deferred revenue, advances and progress billings	32,210		20,428
	Accrued other postretirement benefits	20,116		26,038
	Accrued compensation and benefits	115,294		103,962
	Accrued interest	16,624		17,966
	Warranty reserve	47,203		13,628
	Accrued workers' compensation	16,500		15,010
	Accrued income tax	2,516		796
	Loss contract reserve	99,559		2,236
	Contingent consideration	972		—
	Legal contingencies	—		38,000
	All other	72,806		31,266
	Total accrued expenses	$	427,740	$	273,290

LONGTERM_DEBT_Tables

LONG-TERM DEBT (Tables)	12 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Schedule of long-term debt
		March 31,
		2015		2014
	Revolving credit facility	$	148,255	$	194,406
	Term loan	356,250		375,000
	Receivable securitization facility	100,000		162,400
	Equipment leasing facility	91,913		74,342
	Senior notes due 2018	—		348,423
	Senior notes due 2021	375,000		375,000
	Senior notes due 2022	300,000		—
	Convertible senior subordinated notes	—		12,834
	Other debt	7,978		7,978
		1,379,396		1,550,383
	Less: current portion	42,255		49,575
		$	1,337,141	$	1,500,808

LONGTERM_DEBT_Fair_Value_of_De

LONG-TERM DEBT Fair Value of Debt by Year (Tables)	12 Months Ended
	Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, by Balance Sheet Grouping [Table Text Block]
	March 31, 2015				March 31, 2014
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value
	$	1,379,396	$	1,358,306	$	1,550,383	$	1,580,447

OTHER_NONCURRENT_LIABILITIES_O

OTHER NONCURRENT LIABILITIES OTHER NONCURRENT LIABILITIES (Tables)	12 Months Ended
	Mar. 31, 2015
Other Liabilities, Noncurrent [Abstract]
Schedule of Other Assets and Other Liabilities [Table Text Block]
		March 31,
		2015		2014
	Acquired contract liabilities, net	$	644,950	$	141,505
	Deferred grant income	20,354		21,905
	Accrued workers' compensation	15,657		18,077
	Environmental contingencies	8,638		9,959
	Accrued warranties	31,769		12,022
	Income tax reserves	3,690		3,196
	Contingent consideration	—		1,740
	Legal contingencies	9,500		9,500
	All other	19,495		16,852
	Total other noncurrent liabilities	$	754,053	$	234,756

INCOME_TAXES_INCOME_TAXES_Tabl

INCOME TAXES INCOME TAXES (Tables)	12 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
		Year ended March 31,
		2015				2014				2013
	Foreign	$	(429	)		$	3,482			$	11,829
	Domestic	349,723				308,751				451,228
		$	349,294			$	312,233			$	463,057
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
		Year ended March 31,
		2015				2014				2013
	Current:
	Federal	$	391			$	672			$	(24,403	)
	State	178				1,346				1,830
	Foreign	4,751				1,090				1,516
		5,320				3,108				(21,057		)
	Deferred:
	Federal	114,260				100,191				176,187
	State	(1,857		)		3,102				10,789
	Foreign	(7,126		)		(424		)		(209		)
		105,277				102,869				186,767
		$	110,597			$	105,977			$	165,710
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
		Year ended March 31,
		2015			2014			2013
	Statutory federal income tax rate	35	%		35	%		35	%
	State and local income taxes, net of federal tax benefit	0.5			0.9			1.8
	Miscellaneous permanent items and nondeductible accruals	(0.7	)		0.5			(0.3	)
	Research and development tax credit	(1.9	)		(1.8	)		(1.1	)
	Foreign tax credits	(0.2	)		—			—
	Other	(1.0	)		(0.7	)		0.4
	Effective income tax rate	31.7	%		33.9	%		35.8	%
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
		March 31,
		2015				2014
	Deferred tax assets:
	Net operating loss and other credit carryforwards	$	186,172			$	196,599
	Inventory	2,987				6,687
	Accruals and reserves	39,041				34,339
	Pension and other postretirement benefits	186,806				186,941
	Acquired contract liabilities, net	146,515				48,500
	Other	—				737
		561,521				473,803
	Valuation allowance	(1,472		)		(1,424		)
	Net deferred tax assets	560,049				472,379
	Deferred tax liabilities:
	Long-term contract accounting	311,521				317,377
	Property and equipment	144,681				141,854
	Goodwill and other intangible assets	342,794				333,889
	Prepaid expenses and other	4,228				7,139
		803,224				800,259
	Net deferred tax liabilities	$	243,175			$	327,880
Summary of Income Tax Contingencies [Table Text Block]
	Ending Balance—March 31, 2013	$	7,710
	Additions for tax positions related to the current year	774
	Additions for tax positions of prior years	1,475
	Reductions for tax positions of prior years	(666		)
	Reductions as a result of a lapse of statute of limitations	—
	Settlements	—
	Ending Balance—March 31, 2014	9,293
	Additions for tax positions related to the current year	962
	Additions for tax positions of prior years	178
	Reductions for tax positions of prior years	(1,607		)
	Reductions as a result of a lapse of statute of limitations	—
	Settlements	—
	Ending Balance—March 31, 2015	$	8,826

EARNINGS_PER_SHARE_Tables

EARNINGS PER SHARE (Tables)	12 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Reconciliation between the weighted average outstanding shares used in calculation of basic and diluted earnings per share
		Year ended March 31,
		2015	2014	2013
		(thousands)
	Weighted-average common shares outstanding—basic	50,796	51,711	49,663
	Net effect of dilutive stock options and nonvested stock	169	265	382
	Net effect of convertible debt	40	811	2,401
	Weighted-average common shares outstanding—diluted	51,005	52,787	52,446

PENSION_AND_OTHER_POSTRETIREME1

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables)	12 Months Ended
	Mar. 31, 2015																					Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
		Pension Benefits								Other
										Postretirement
										Benefits
		Year ended March 31,								Year ended March 31,
		2015				2014				2015			2014
	Change in projected benefit obligations
	Projected benefit obligation at beginning of year	$	2,160,708			$	2,390,201			$	311,012		$	347,555
	Service cost	12,902				12,854				2,868			3,060
	Interest cost	90,576				92,938				12,332			12,552
	Actuarial loss (gain)	341,719				(24,361		)		(61,261		)	(22,078		)
	Acquisitions	39,575				13,324				—			—
	Plan amendments	50				58				—			—
	Participant contributions	145				—				3,339			6,449
	Curtailments	—				(7,851		)		—			—
	Settlements	—				(171,450		)		—			—
	Benefits paid	(158,638		)		(144,078		)		(29,023		)	(36,526		)
	Currency translation adjustment	(7,718		)		(927		)		—			—
	Projected benefit obligation at end of year	$	2,479,319			$	2,160,708			$	239,267		$	311,012
	Accumulated benefit obligation at end of year	$	2,464,418			$	2,148,824			$	239,267		$	311,012
	Weighted-average assumptions used to determine benefit obligations at end of year
	Discount rate	3.78		%		4.32		%		3.66		%	4.14		%
	Rate of compensation increase	3.5		%		3.5		%		N/A			N/A
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
		Pension Benefits								Other
										Postretirement
										Benefits
		Year ended March 31,								Year ended March 31,
		2015				2014				2015			2014
	Change in fair value of plan assets
	Fair value of plan assets at beginning of year	$	1,933,269			$	2,030,210			$	—		$	—
	Actual return on plan assets	236,782				160,297				—			—
	Settlements	—				(171,450		)		—			—
	Participant contributions	145				—				3,339			6,449
	Company contributions	112,338				46,347				25,684			30,077
	Acquisitions	39,651				12,853				—			—
	Benefits paid	(158,638		)		(144,078		)		(29,023		)	(36,526		)
	Currency translation adjustment	(7,399		)		(910		)		—			—
	Fair value of plan assets at end of year	$	2,156,148			$	1,933,269			$	—		$	—
	Funded status (underfunded)
	Funded status	$	(323,171	)		$	(227,439	)		$	(239,267	)	$	(311,012	)
	Reconciliation of amounts recognized in the consolidated balance sheets
	Pension asset—noncurrent	$	—			$	71			$	—		$	—
	Accrued benefit liability—current	(3,940		)		(3,960		)		(20,116		)	(26,038		)
	Accrued benefit liability—noncurrent	(319,231		)		(223,550		)		(219,151		)	(284,974		)
	Net amount recognized	$	(323,171	)		$	(227,439	)		$	(239,267	)	$	(311,012	)
	Reconciliation of amounts recognized in accumulated other comprehensive income
	Prior service credits	$	(20,155	)		$	(25,493	)		$	(8,682	)	$	(13,211	)
	Actuarial losses (gains)	340,034				85,076				(74,615		)	(13,354		)
	Income tax (benefits) related to above items	(118,445		)		(22,384		)		31,265			9,968
	Unamortized benefit plan costs (gains)	$	201,434			$	37,199			$	(52,032	)	$	(16,597	)
Schedule of components of net periodic benefit cost and postretirement benefit plan
		Pension Benefits											Other
													Postretirement Benefits
		Year Ended March 31,											Year Ended March 31,
		2015				2014				2013			2015			2014			2013
	Components of net periodic pension cost
	Service cost	$	12,902			$	12,854			$	18,503		$	2,868		$	3,060		$	3,538
	Interest cost	90,576				92,938				98,348			12,332			12,552			15,762
	Expected return on plan assets	(150,565		)		(147,545		)		(137,334		)	—			—			—
	Amortization of prior service credit cost	(5,288		)		(6,731		)		(5,829		)	(4,529		)	(4,529		)	(4,529		)
	Amortization of net loss	—				13,487				318			—			—			—
	Curtailment (gain) loss	—				(395		)		23,662			—			—			—
	Settlements	—				1,561				—			—			—			—
	Special termination benefits	—				—				10,819			—			—			—
	Total net periodic benefit (income) expense	$	(52,375	)		$	(33,831	)		$	8,487		$	10,671		$	11,083		$	14,771
	Weighted-average assumptions used to determine net periodic pension cost
	Discount rate	4.32		%		4.07		%		4.62		%	4.14		%	3.79		%	4.35		%
	Expected long-term rate on assets	8.25		%		8.25		%		8.25		%	N/A			N/A			N/A
	Rate of compensation increase	3.5		%		3.5		%		3.5		%	N/A			N/A			N/A
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
		Pension				Other
		Benefits				Postretirement
						Benefits
	Amounts expected to be recognized in FY 2016 net periodic benefit costs
	Prior service cost/(credit) ($3,297 and $2,830 net of tax, respectively)	$	(5,278	)		$	(4,530	)
	Actuarial (loss)/gain ($6,577 and ($4,035) net of tax, respectively)	$	(10,521	)		$	6,460
Schedule of Expected Benefit Payments [Table Text Block]
	Year	Pension				Other
		Benefits				Postretirement
						Benefits*
	2016	$	181,617			$	20,482
	2017	174,814				19,714
	2018	171,769				19,083
	2019	167,056				19,022
	2020	165,079				18,373
	2020 - 2024	784,000				81,210
Schedule of Allocation of Plan Assets [Table Text Block]
	March 31, 2015																					March 31, 2014
		Level 1				Level 2				Level 3			Total										Level 1		Level 2		Level 3		Total
	Assets																					Assets
	Cash and cash equivalents	$	91,499			$	1,562			$	—		$	93,061								Cash and cash equivalents	$	26,261	$	805	$	—	$	27,066
	Equity securities																					Equity securities
	International	181,061				—				—			181,061									International	196,008		—		—		196,008
	US equity	72,911				—				—			72,911									US equity	70,520		—		—		70,520
	US commingled fund	619,297				—				—			619,297									US commingled fund	563,116		—		—		563,116
	International commingled fund	47,366				68,165				—			115,531									International commingled fund	26,579		42,497		—		69,076
	Fixed income securities																					Fixed income securities
	Corporate bonds	—				25,604				—			25,604									Corporate bonds	—		19,628		—		19,628
	Government securities	—				182,456				—			182,456									Government securities	—		163,241		—		163,241
	US commingled fund	676,557				90,341				—			766,898									Commingled fund	636,476		88,125		—		724,601
	International commingled fund	10,174				3,512							13,686									Mortgage-backed securities	—		8,362		—		8,362
	Other fixed income	—				8,415				—			8,415									Other
																						Private equity and infrastructure	—		—		89,113		89,113
	Other
	Private equity and infrastructure	—				—				79,692			79,692									Total investment in securities—assets	$	1,518,960	$	322,658	$	89,113	$	1,930,731
	Insurance contracts	—				—				920			920									Receivables							2,568
	Total investment in securities—assets	$	1,698,865			$	380,055			$	80,612		$	2,159,532								Payables							(30		)
																						Total plan assets							$	1,933,269
	Receivables												2,609
	Payables												(5,993		)
	Total plan assets												$	2,156,148
				Actual
		Target		Allocation
		Allocation		March 31,
	Asset Category	Fiscal 2015		2015			2014
	Equity securities	50 - 65%		45	%		47	%
	Fixed income securities	20 - 45%		51			48
	Alternative investment funds	2 - 10%		4			5
	Total			100	%		100	%
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
		March 31, 2014				Acquisitions				Net Purchases			Net Realized			Net Unrealized			March 31, 2015
		Balance								(Sales)			Appreciation			Appreciation			Balance
													(Depreciation)			(Depreciation)
	Private equity funds	$	89,113			—				$	(20,757	)	$	(1,002	)	$	12,338		$	79,692
	Insurance contracts	$	—			920				$	—		$	—		$	—		$	920
	Total	$	89,113			$	920			$	(20,757	)	$	(1,002	)	$	12,338		$	80,612
		March 31, 2013 Balance				Net Purchases				Net Realized			Net Unrealized			March 31, 2014
						(Sales)				Appreciation			Appreciation			Balance
										(Depreciation)			(Depreciation)
	Private equity funds	$	95,015			$	(18,976	)		$	11,157		$	1,917		$	89,113
Scheduled of Effect of a 25 Basis Point Change in Discount Rates on Defined Benefit Obligations [Table Text Block]
			Pension Benefits				Other
							Postretirement
							Benefits
	Increase of 25 basis points
	Obligation	*	$	(72,900	)		$	(5,407	)
	Net periodic expense		(800		)		414
	Decrease of 25 basis points
	Obligation	*	$	76,600			$	5,644
	Net periodic expense		600				(431		)
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
		Other Postretirement Benefits
		One-Percentage-				One-Percentage-
		Point Increase				Point Decrease
	Net periodic expense	$	453			$	(403	)
	Obligation	8,142				(7,225		)

STOCK_COMPENSATION_PLANS_STOCK

STOCK COMPENSATION PLANS STOCK COMPENSATION PLANS (Tables)	12 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
		Options		Weighted-		Weighted-	Aggregate
				Average		Average	Intrinsic Value
				Exercise		Remaining
				Price		Contractual
						Term (in Years)
	Outstanding at March 31, 2014	49,718		$	15.72
	Exercised	(45,782	)	15.72
	Forfeited	—		—
	Outstanding at March 31, 2015	3,936		$	15.37	0.1	$	195,777
	Exercisable at March 31, 2015	3,936		$	15.37	0.1	$	195,777
Schedule of Nonvested Share Activity [Table Text Block]
		Shares		Weighted-
				Average Grant
				Date Fair Value
	Nonvested restricted stock and deferred stock units at March 31, 2014	271,211		$	59.37
	Granted	8,800		64.44
	Vested	(103,129	)	55.49
	Forfeited	(1,500	)	72.76
	Nonvested restricted stock and deferred stock units at March 31, 2015	175,382		$	61.79

FAIR_VALUE_MEASUREMENTS_Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Schedule of carrying amounts and the related estimated fair values of financial instruments
	March 31, 2015				March 31, 2014
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value
	$	1,379,396	$	1,358,306	$	1,550,383	$	1,580,447

SEGMENTS_Tables

SEGMENTS (Tables)	12 Months Ended
	Mar. 31, 2015
Financial information of reportable segment and the reconciliation of EBITDA to operating income
Schedule of selected financial information for each reportable segment and the reconciliation of EBITDA to operating income
		Year Ended March 31,
		2015			2014			2013
	Net sales:
	Aerostructures	$	2,507,878		$	2,612,439		$	2,781,344
	Aerospace systems	1,089,117			871,750			615,771
	Aftermarket services	304,013			287,343			314,507
	Elimination of inter-segment sales	(12,286		)	(8,278		)	(8,920		)
		$	3,888,722		$	3,763,254		$	3,702,702
	Income before income taxes:
	Operating income (loss):
	Aerostructures	$	127,495		$	252,910		$	469,873
	Aerospace systems	184,042			149,721			103,179
	Aftermarket services	47,931			42,265			45,380
	Corporate	75,205			(44,892		)	(87,219		)
		434,673			400,004			531,213
	Interest expense and other	85,379			87,771			68,156
		$	349,294		$	312,233		$	463,057
	Depreciation and amortization:
	Aerostructures	$	100,096		$	114,302		$	95,884
	Aerospace systems	45,200			37,453			19,870
	Aftermarket services	8,559			7,529			9,118
	Corporate	4,468			4,993			4,634
		$	158,323		$	164,277		$	129,506
	Amortization of acquired contract liabilities, net:
	Aerostructures	$	38,719		$	25,207		$	25,457
	Aerospace systems	37,014			17,422			187
		$	75,733		$	42,629		$	25,644
	Adjusted EBITDA:
	Aerostructures	$	188,872		$	342,005		$	540,300
	Aerospace systems	192,228			169,752			122,862
	Aftermarket services	56,490			49,794			54,498
	Corporate	(55,020		)	(38,733		)	(48,104		)
		$	382,570		$	522,818		$	669,556
		Year Ended March 31,
		2015			2014			2013
	Capital expenditures:
	Aerostructures	$	72,242		$	167,198		$	90,466
	Aerospace systems	30,531			21,935			19,388
	Aftermarket services	5,645			13,940			14,820
	Corporate	1,586			3,341			2,216
		$	110,004		$	206,414		$	126,890
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
		March 31,
		2015			2014
	Total Assets:
	Aerostructures	$	4,004,642		$	3,880,645
	Aerospace systems	1,474,362			1,255,136
	Aftermarket services	375,786			316,643
	Corporate	214,653			100,962
		$	6,069,443		$	5,553,386

SELECTED_CONSOLIDATING_FINANCI1

SELECTED CONSOLIDATING FINANCIAL STATEMENTS OF PARENT, GUARANTORS AND NON-GUARANTORS (Tables)	12 Months Ended
	Mar. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Summary of consolidating balance sheets
		March 31, 2015
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries						Total
	Current assets:
	Cash and cash equivalents	$	620		$	419		$	31,578		$	—		$	32,617
	Trade and other receivables, net	3,578			180,796			337,472			—			521,846
	Inventories	—			1,193,528			79,351			—			1,272,879
	Rotable assets	—			35,248			13,572			—			48,820
	Deferred income taxes	—			145,352			—			—			145,352
	Prepaid expenses and other	6,509			10,580			6,011			—			23,100
	Total current assets	10,707			1,565,923			467,984			—			2,044,614
	Property and equipment, net	8,209			806,442			134,251			—			948,902
	Goodwill and other intangible assets, net	—			2,783,117			219,866			—			3,002,983
	Other, net	24,601			34,955			13,388			—			72,944
	Intercompany investments and advances	4,062,058			81,540			63,897			(4,207,495		)	—
	Total assets	$	4,105,575		$	5,271,977		$	899,386		$	(4,207,495	)	$	6,069,443
	Current liabilities:
	Current portion of long-term debt	$	19,024		$	23,231		$	—		$	—		$	42,255
	Accounts payable	8,919			380,457			38,072			—			427,448
	Accrued expenses	38,275			326,455			63,010			—			427,740
	Total current liabilities	66,218			730,143			101,082			—			897,443
	Long-term debt, less current portion	1,166,095			71,046			100,000			—			1,337,141
	Intercompany debt	719,525			1,769,564			407,722			(2,896,811		)	—
	Accrued pension and other postretirement benefits, noncurrent	7,517			527,741			3,123			—			538,381
	Deferred income taxes and other	10,435			1,088,896			61,363			—			1,160,694
	Total stockholders' equity	2,135,785			1,084,587			226,096			(1,310,684		)	2,135,784
	Total liabilities and stockholders' equity	$	4,105,575		$	5,271,977		$	899,386		$	(4,207,495	)	$	6,069,443
	SUMMARY CONSOLIDATING BALANCE SHEETS:
		March 31, 2014
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries						Total
	Current assets:
	Cash and cash equivalents	$	2,820		$	1,149		$	25,029		$	—		$	28,998
	Trade and other receivables, net	1,591			226,407			289,306			—			517,304
	Inventories	—			1,041,719			70,048			—			1,111,767
	Rotable assets	—			28,113			13,553			—			41,666
	Deferred income taxes	—			57,291			17			—			57,308
	Prepaid and other	6,977			13,674			4,246			—			24,897
	Total current assets	11,388			1,368,353			402,199			—			1,781,940
	Property and equipment, net	9,933			801,560			119,937			—			931,430
	Goodwill and other intangible assets, net	—			2,625,121			144,941			—			2,770,062
	Other, net	58,536			7,860			3,558			—			69,954
	Intercompany investments and advances	4,094,443			84,180			12,333			(4,190,956		)	—
	Total assets	$	4,174,300		$	4,887,074		$	682,968		$	(4,190,956	)	$	5,553,386
	Current liabilities:
	Current portion of long-term debt	$	31,844		$	17,731		$	—		$	—		$	49,575
	Accounts payable	1,150			296,968			19,216			—			317,334
	Accrued expenses	36,034			212,984			24,272			—			273,290
	Total current liabilities	69,028			527,683			43,488			—			640,199
	Long-term debt, less current portion	1,279,694			58,714			162,400			—			1,500,808
	Intercompany debt	525,216			2,021,330			304,613			(2,851,159		)	—
	Accrued pension and other postretirement benefits, noncurrent	6,795			501,716			13			—			508,524
	Deferred income taxes and other	9,656			586,174			24,114			—			619,944
	Total stockholders' equity	2,283,911			1,191,457			148,340			(1,339,797		)	2,283,911
	Total liabilities and stockholders' equity	$	4,174,300		$	4,887,074		$	682,968		$	(4,190,956	)	$	5,553,386
Condensed consolidating statements of income
		Fiscal year ended March 31, 2015
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries						Total
	Net sales	$	—		$	3,592,062		$	320,907		$	(24,247	)	$	3,888,722
	Operating costs and expenses:
	Cost of sales	—			2,900,408			265,292			(24,247		)	3,141,453
	Selling, general and administrative	50,562			199,569			35,642			—			285,773
	Depreciation and amortization	2,269			141,561			14,493			—			158,323
	Relocation costs	—			3,193			—			—			3,193
	Gain on legal settlement, net of expenses	(134,693		)	—			—			—			(134,693		)
		(81,862		)	3,244,731			315,427			(24,247		)	3,454,049
	Operating income	81,862			347,331			5,480			—			434,673
	Intercompany interest and charges	(205,075		)	196,394			8,681			—			—
	Interest expense and other	85,555			10,438			(10,614		)	—			85,379
	Income from continuing operations, before income taxes	201,382			140,499			7,413			—			349,294
	Income tax expense (income)	58,049			54,359			(1,811		)	—			110,597
	Net income	143,333			86,140			9,224			—			238,697
	Other comprehensive income	(4,253		)	(128,800		)	(46,949		)	—			(180,002		)
	Total comprehensive income	$	139,080		$	(42,660	)	$	(37,725	)	$	—		$	58,695
	CONDENSED CONSOLIDATING STATEMENTS OF INCOME AND COMPREHENSIVE INCOME:
		Fiscal year ended March 31, 2014
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries						Total
	Net sales	$	—		$	3,569,094		$	197,987		$	(3,827	)	$	3,763,254
	Operating costs and expenses:
	Cost of sales	—			2,760,627			155,002			(3,827		)	2,911,802
	Selling, general and administrative	36,670			192,422			25,623			—			254,715
	Depreciation and amortization	2,782			152,593			8,902			—			164,277
	Relocation costs	—			31,290			—			—			31,290
	Curtailments, settlements and early retirement incentives	1,166			—			—			—			1,166
		40,618			3,136,932			189,527			(3,827		)	3,363,250
	Operating (loss) income	(40,618		)	432,162			8,460			—			400,004
	Intercompany interest and charges	(215,079		)	207,397			7,682			—			—
	Interest expense and other	86,094			6,103			(4,426		)	—			87,771
	Income from continuing operations, before income taxes	88,367			218,662			5,204			—			312,233
	Income tax expense	20,478			85,061			438			—			105,977
	Net income	67,889			133,601			4,766			—			206,256
	Other comprehensive income (loss)	1,481			43,898			(3,315		)	—			42,064
	Total comprehensive income	$	69,370		$	177,499		$	1,451		$	—		$	248,320
	CONDENSED CONSOLIDATING STATEMENTS OF INCOME AND COMPREHENSIVE INCOME:
		Fiscal year ended March 31, 2013
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries						Total
	Net sales	$	—		$	3,608,064		$	99,593		$	(4,955	)	$	3,702,702
	Operating costs and expenses:
	Cost of sales	—			2,703,416			65,027			(4,955		)	2,763,488
	Selling, general and administrative	8,530			213,408			19,411			—			241,349
	Depreciation and amortization	2,430			122,626			4,450			—			129,506
	Acquisition and integration	588			2,077			—			—			2,665
	Curtailments and early retirement incentives	34,481			—			—			—			34,481
		46,029			3,041,527			88,888			(4,955		)	3,171,489
	Operating (loss) income	(46,029		)	566,537			10,705			—			531,213
	Intercompany interest and charges	(191,025		)	187,713			3,312			—			—
	Interest expense and other	61,962			9,463			(3,269		)	—			68,156
	Income from continuing operations, before income taxes	83,034			369,361			10,662			—			463,057
	Income tax expense	24,782			139,799			1,129			—			165,710
	Net income	58,252			229,562			9,533			—			297,347
	Other comprehensive loss	—			(49,834		)	(1,832		)	—			(51,666		)
	Total comprehensive income	$	58,252		$	179,728		$	7,701		$	—		$	245,681
Condensed consolidating statements of cash flows
		Fiscal year ended March 31, 2015
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries						Total
	Net income	$	143,333		$	86,140		$	9,224		$	—		$	238,697
	Adjustments to reconcile net income to net cash (used in) provided by operating activities	(154,295		)	397,607			(25,590		)	10,913			228,635
	Net cash provided by (used in) operating activities	(10,962		)	483,747			(16,366		)	10,913			467,332
	Capital expenditures	(905		)	(92,686		)	(16,413		)	—			(110,004		)
	Reimbursements of capital expenditures	—			653			—			—			653
	Proceeds from sale of assets and businesses	—			3,092			75			—			3,167
	Cash used for businesses and intangible assets acquired	—			112,110			(73,829		)	—			38,281
	Net cash (used in) provided by investing activities	(905		)	23,169			(90,167		)	—			(67,903		)
	Net increase in revolving credit facility	(46,150		)	—			—			—			(46,150		)
	Proceeds on issuance of debt	300,000			37,660			171,300			—			508,960
	Retirements and repayments of debt	(401,232		)	(20,928		)	(233,700		)	—			(655,860		)
	Purchase of common stock	(184,380		)	—			—			—			(184,380		)
	Payments of deferred financing costs	(6,487		)	—			—			—			(6,487		)
	Dividends paid	(8,100		)	—			—			—			(8,100		)
	Proceeds from governmental grant	—			(3,198		)	—			—			(3,198		)
	Repurchase of restricted shares for minimum tax obligation	(673		)	—			—			—			(673		)
	Proceeds from exercise of stock options, including excess tax benefit	720			—			—			—			720
	Intercompany financing and advances	355,969			(521,180		)	176,124			(10,913		)	—
	Net cash provided by (used in) financing activities	9,667			(507,646		)	113,724			(10,913		)	(395,168		)
	Effect of exchange rate changes on cash and cash equivalents	—			—			(642		)	—			(642		)
	Net change in cash and cash equivalents	(2,200		)	(730		)	6,549			—			3,619
	Cash and cash equivalents at beginning of year	2,820			1,149			25,029			—			28,998
	Cash and cash equivalents at end of year	$	620		$	419		$	31,578		$	—		$	32,617
	CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS:
		Fiscal year ended March 31, 2014
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries						Total
	Net income	$	67,889		$	133,601		$	4,766		$	—		$	206,256
	Adjustments to reconcile net income to net cash provided by (used in) operating activities	108,816			(170,631		)	(3,502		)	(5,802		)	(71,119		)
	Net cash provided by (used in) operating activities	176,705			(37,030		)	1,264			(5,802		)	135,137
	Capital expenditures	(2,381		)	(185,794		)	(18,239		)	—			(206,414		)
	Reimbursements of capital expenditures	—			9,086			—			—			9,086
	Proceeds from sale of assets and businesses	—			45,038			9			—			45,047
	Cash used for businesses and intangible assets acquired	—			(6,505		)	(87,951		)	—			(94,456		)
	Net cash used in investing activities	(2,381		)	(138,175		)	(106,181		)	—			(246,737		)
	Net increase in revolving credit facility	98,557			—			—			—			98,557
	Proceeds on issuance of debt	375,000			30,503			45,500			—			451,003
	Retirements and repayments of debt	(271,812		)	(27,218		)	(117,615		)	—			(416,645		)
	Purchase of common stock	(19,134		)	—			—			—			(19,134		)
	Payments of deferred financing costs	(3,297		)	—			—			—			(3,297		)
	Dividends paid	(8,344		)	—			—			—			(8,344		)
	Repayment of governmental grant	—			3,456			—			—			3,456
	Repurchase of restricted shares for minimum tax obligation	(2,726		)	—			—			—			(2,726		)
	Proceeds from exercise of stock options, including excess tax benefit	329			—			—			—			329
	Intercompany financing and advances	(343,187		)	168,076			169,309			5,802			—
	Net cash (used in) provided by financing activities	(174,614		)	174,817			97,194			5,802			103,199
	Effect of exchange rate changes on cash and cash equivalents	—			—			5,362			—			5,362
	Net change in cash and cash equivalents	(290		)	(388		)	(2,361		)	—			(3,039		)
	Cash and cash equivalents at beginning of year	3,110			1,537			27,390			—			32,037
	Cash and cash equivalents at end of year	$	2,820		$	1,149		$	25,029		$	—		$	28,998
	CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS:
		Fiscal year ended March 31, 2013
		Parent			Guarantor			Non-Guarantor			Eliminations			Consolidated
					Subsidiaries			Subsidiaries						Total
	Net income	$	58,252		$	229,562		$	9,533		$	—		$	297,347
	Adjustments to reconcile net income to net cash provided by operating activities	42,111			4,046			(22,586		)	—			23,571
	Net cash provided by (used in) operating activities	100,363			233,608			(13,053		)	—			320,918
	Capital expenditures	(1,315		)	(119,949		)	(5,626		)	—			(126,890		)
	Reimbursements of capital expenditures	—			5,156			—			—			5,156
	Proceeds from sale of assets and businesses	—			3,985			8			—			3,993
Cash used for businesses and intangible assets acquired	—			(349,632		)	—			—			(349,632		)
Net cash used in investing activities	(1,315		)	(460,440		)	(5,618		)	—			(467,373		)
Net decrease in revolving credit facility	(224,151		)	—			—			—			(224,151		)
Proceeds on issuance of debt	375,000			14,435			138,700			—			528,135
Retirements and repayments of debt	(19,594		)	(14,044		)	(108,700		)	—			(142,338		)
Payments of deferred financing costs	(8,838		)	—			—			—			(8,838		)
Dividends paid	(8,005		)	—			—			—			(8,005		)
Repayment of governmental grant	—			(1,090		)	—			—			(1,090		)
Repurchase of restricted shares for minimum tax obligation	(1,840		)	—			—			—			(1,840		)
Proceeds from exercise of stock options, including excess tax benefit	6,766			—			—			—			6,766
Intercompany financing and advances	(223,245		)	226,831			(3,586		)	—			—
Net cash (used in) provided by financing activities	(103,907		)	226,132			26,414			—			148,639
Effect of exchange rate changes on cash and cash equivalents	—			—			191			—			191
Net change in cash and cash equivalents	(4,859		)	(700		)	7,934			—			2,375
Cash and cash equivalents at beginning of year	7,969			2,237			19,456			—			29,662
Cash and cash equivalents at end of year	$	3,110		$	1,537		$	27,390		$	—		$	32,037

QUARTERLY_FINANCIAL_INFORMATIO1

QUARTERLY FINANCIAL INFORMATION (Unaudited) QUARTERLY FINANCIAL INFORMATION (Unaudited) (Tables)	12 Months Ended
	Mar. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information [Table Text Block]
		Fiscal 2015												Fiscal 2014
		June 30 (6) (7)			Sept. 30			Dec. 31 (8) (9)			Mar. 31			June 30 (4)			Sept. 30			Dec. 31 (5)			Mar. 31
	BUSINESS SEGMENT SALES
	Aerostructures	$	611,863		$	632,072		$	559,465		$	704,478		$	651,888		$	690,748		$	637,202		$	632,601
	Aerospace Systems	219,852			288,902			279,198			301,165			219,526			205,483			211,402			235,339
	Aftermarket Services	67,608			74,343			80,690			81,372			74,353			72,971			69,556			70,463
	Inter-segment Elimination	(2,418		)	(1,194		)	(1,936		)	(6,738		)	(2,084		)	(1,857		)	(2,344		)	(1,993		)
	TOTAL SALES	$	896,905		$	994,123		$	917,417		$	1,080,277		$	943,683		$	967,345		$	915,816		$	936,410
	GROSS PROFIT(1)	$	188,112		$	197,566		$	24,068		$	237,071		$	222,303		$	171,143		$	166,518		$	182,243
	OPERATING INCOME
	Aerostructures	$	70,866		$	72,230		$	(102,461	)	$	86,861		$	100,387		$	64,425		$	52,412		$	35,686
	Aerospace Systems	37,352			46,214			41,863			58,612			42,643			31,740			32,504			42,834
	Aftermarket Services	10,504			11,620			12,490			13,317			11,279			10,102			9,297			11,587
	Corporate	121,802			(15,366		)	(13,158		)	(18,073		)	(12,963		)	(13,296		)	(9,434		)	(9,199		)
	TOTAL OPERATING INCOME	$	240,524		$	114,698		$	(61,266	)	$	140,717		$	141,346		$	92,971		84,779			$	80,908
	NET INCOME	$	128,243		$	67,446		$	(39,832	)	$	82,840		$	79,043		$	49,516		35,393			$	42,304
	Basic Earnings (Loss) per share(2)	$	2.48		$	1.32		$	(0.79	)	$	1.66		$	1.56		$	0.96		$	0.68		$	0.81
	Diluted Earnings (Loss) per share(2)(3)	$	2.46		$	1.32		$	(0.79	)	$	1.66		$	1.5		$	0.94		$	0.67		$	0.8

Valuation_and_Qualifying_Accou1

Valuation and Qualifying Accounts Valuation and Qualifying Accounts (Tables)	12 Months Ended
	Mar. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
		Balance at		Additions	Additions(1)	(Deductions)(2)		Balance at
		beginning of		charged to				end of year
		year		expense
	For year ended March 31, 2015:
	Allowance for doubtful accounts receivable	$	6,535	171	85	(316	)	$	6,475
	For year ended March 31, 2014:
	Allowance for doubtful accounts receivable	$	5,372	2,191	6	(1,034	)	$	6,535
	For year ended March 31, 2013:
	Allowance for doubtful accounts receivable	$	3,900	1,974	70	(572	)	$	5,372

AMORTIZATION_OF_ACQUIRED_CONTR

AMORTIZATION OF ACQUIRED CONTRACTS POLICIES (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	6-May-13
Revenue Recognition
Amortization of acquired contract liabilities	($75,733)	($42,629)	($25,644)
Acquired contract liabilities, net	644,950	141,505
Primus [Member]
Revenue Recognition
Acquired contract liabilities, net				26,280
Aerostructures
Revenue Recognition
Amortization of acquired contract liabilities	-38,719	-25,207	-25,457
Future Amortization Income, Year One	130,087
Future Amortization Income, Year Two	127,003
Future Amortization Income, Year Three	119,207
Future Amortization Income, Year Four	115,550
Future Amortization Income, Year Five	$69,090

TRADE_AND_OTHER_RECEIVABLES_PO

TRADE AND OTHER RECEIVABLES POLICIES (Details 3) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billed	$475,913	$487,344
Unbilled	39,222	12,333
Total trade receivables	515,135	499,677
Other receivables	13,186	24,162
Total trade and other receivables	528,321	523,839
Trade and other receivables, allowance for doubtful accounts (in dollars)	-6,475	-6,535
Total trade and other receivables, net	$521,846	$517,304

MISCELLANEOUS_ACCOUNTING_POLIC

MISCELLANEOUS ACCOUNTING POLICIES (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Concentration of Credit Risk
Business Acquisition, Purchase Price Allocation, Unfavorable Contract Accrual	$644,950	$141,505
Preproduction Costs Related to Long-term Supply Arrangements, Costs Capitalized	306,983	131,358
Amortization of Acquired Contract Liabilities	75,733	42,629	25,644
Stock-Based Compensation
Share-based Compensation	1,272	4,653	6,367
Benefits of tax deductions in excess of recognized compensation expense	0	39	4,628
Research and Development Expense [Abstract]
Research and Development Expense	81,205	61,657	61,270
Aerostructures
Concentration of Credit Risk
Amortization of Acquired Contract Liabilities	$38,719	$25,207	$25,457
Net sales
Concentration of Credit Risk
Concentration Risk, Percentage	42.00%	45.00%	49.00%
Net sales | Aftermarket Services
Concentration of Credit Risk
Concentration Risk, Percentage	7.00%

SUPPLEMENTAL_CASH_FLOW_POLICIE

SUPPLEMENTAL CASH FLOW POLICIES (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Business Acquisition [Line Items]
Deferred Finance Costs, Noncurrent, Net	$17,850	$19,499
Income taxes paid, net of refunds received	22,241	4,157	3,109
Interest Paid	82,425	81,100	62,229
Shares issued to settle the conversion benefit of the notes (in shares)	0	2,290,755	395,269
Equipment leasing facility and other capital leases
Business Acquisition [Line Items]
Capital lease obligations entered into to finance capital additions	$52	$36	$66
Sales Revenue, Goods, Net [Member]
Business Acquisition [Line Items]
Concentration Risk, Percentage	42.00%	45.00%	49.00%
Aftermarket Services | Sales Revenue, Goods, Net [Member]
Business Acquisition [Line Items]
Concentration Risk, Percentage	7.00%

CHANGES_IN_ESTIMATES_POLICIES_

CHANGES IN ESTIMATES POLICIES (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Change in Accounting Estimate [Line Items]
Loss on Contracts	$151,992,000
Operating Income [Member]
Change in Accounting Estimate [Line Items]
Change in Accounting Estimate	-156,048,000	-53,166,000	-14,560,000
Net Income [Member]
Change in Accounting Estimate [Line Items]
Change in Accounting Estimate	-106,639,000	-35,121,000	-9,350,000
Earnings Per Share, Diluted [Member]
Change in Accounting Estimate [Line Items]
Change in Accounting Estimate	-2.09	-0.67	-0.18
Gross Favorable Change in Estimates [Member]
Change in Accounting Estimate [Line Items]
Change in Accounting Estimate	4,653,000	14,341,000	15,913,000
Gross Unfavorable Changes In Estimates [Member]
Change in Accounting Estimate [Line Items]
Change in Accounting Estimate	($160,701,000)	($67,507,000)	($30,473,000)

SUMMARY_OF_SIGNIFICANT_ACCOUNT4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES LONG-LIVED ASSET POLICIES (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Trade Names [Member]
Property, Plant and Equipment [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	438,400	$438,400
Minimum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life	3 years
Minimum [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Minimum	15 years
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Minimum	7 years
Minimum [Member] | Other Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Minimum	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life	32 years
Maximum [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Minimum	39 years 6 months
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Minimum	15 years
Maximum [Member] | Other Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Minimum	10 years

SUMMARY_OF_SIGNIFICANT_ACCOUNT5

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES PRODUCT WARRANTY POLICIES (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accounting Policies [Abstract]
Standard Product Warranty Term (in years)	3
Extended Product Warranty Term (in years)	20
Product Warranty Accrual	$78,972	$25,651

SUMMARY_OF_SIGNIFICANT_ACCOUNT6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES CAPITAL LEASES (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Capital Leased Assets [Line Items]
Stock Issued During Period, Shares, Conversion of Convertible Securities	0	2,290,755	395,269
Capital Lease Obligations [Member]
Capital Leased Assets [Line Items]
Capital Lease Obligations Incurred	52	36	66

SUMMARY_OF_SIGNIFICANT_ACCOUNT7

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES DEFERRED FINANCING COSTS (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Accounting Policies [Abstract]
Deferred Finance Costs, Noncurrent, Net	$17,850	$19,499

SUMMARY_OF_SIGNIFICANT_ACCOUNT8

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUPPLEMENTAL CASH FLOW INFORMATION (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Accounting Policies [Abstract]
Interest Paid	$82,425	$81,100	$62,229
Stock Issued During Period, Shares, Conversion of Convertible Securities	0	2,290,755	395,269
Income Taxes Paid, Net	$22,241	$4,157	$3,109

SUMMARY_OF_SIGNIFICANT_ACCOUNT9

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES STOCK-BASED COMPENSATION (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Accounting Policies [Abstract]
Share-based Compensation	$1,272	$4,653	$6,367
Excess Tax Benefit from Share-based Compensation, Financing Activities	$0	$39	$4,628

Recovered_Sheet1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES INTANGIBLE ASSETS (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	32 years
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	438,400	$438,400

Recovered_Sheet2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES RESEARCH AND DEVELOPMENT (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Accounting Policies [Abstract]
Research and Development Expense	$81,205	$61,657	$61,270

ACQUISITIONS_Details

ACQUISITIONS (Details) (USD $)	12 Months Ended			3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Jun. 30, 2014	Oct. 04, 2013	6-May-13
Acquisitions
Repayments of Convertible Debt	$12,834	$96,535	$19,286
Stock Issued During Period, Shares, Conversion of Convertible Securities	0	2,290,755	395,269
Business Acquisition, Purchase Price Allocation, Goodwill Amount	2,030,594	1,791,891	1,721,720	2,030,594			1,791,891
Acquired contract liabilities, net	644,950	141,505		644,950			141,505
Pro forma results of operations
Net sales		3,939,659	3,991,532
Income from continuing operations		240,746	207,142
Income from continuing operations - basic (in dollars per share)		$4.74	$4.01
Income from continuing operations - diluted (in dollars per share)		$4.72	$3.92
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	307,558
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	41,679
Intangible Assets (Excluding Goodwill), Gross	1,186,927	1,144,683		1,186,927			1,144,683
Tulsa Programs [Member]
Acquisitions
Business Acquisition, Integration, Restructuring and Other Related Costs [Text Block]	5000
Cash	160,000			160,000
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables	4,929			4,929
Inventory	72,363			72,363
Property and equipment	14,781			14,781
Business Acquisition, Purchase Price Allocation, Goodwill Amount	74,837			74,837
Business Combination, Liabilities Arising from Contingencies, Amount Recognized	-28,281			-28,281
Business Combination, Indemnification Assets, Amount as of Acquisition Date	23,090			23,090
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	18,161			18,161
Other assets	53,131			53,131
Total assets	238,202			238,202
Accounts payable	17,227			17,227
Acquired contract liabilities, net	358,735			358,735
Other noncurrent liabilities	22,240			22,240
Total liabilities	398,202			398,202
NAAS [Member]
Acquisitions
Cash	803			803
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables	4,974			4,974
Inventory	866			866
Property and equipment	216			216
Business Acquisition, Purchase Price Allocation, Goodwill Amount	25,159			25,159
Intangible assets	17,000			17,000
Other assets	280			280
Total assets	49,298			49,298
Accounts payable	232			232
Accrued expenses	935			935
Other noncurrent liabilities	3,611			3,611
Total liabilities	4,778			4,778
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	11 years
Business Acquisition, Cost of Acquired Entity, Cash Paid	44,520
Business Combination, Consideration Transferred, Other	167
Business Combination, Acquisition Related Costs	654
GE [Member]
Acquisitions
Cash	4,608			4,608
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables	35,582			35,582
Inventory	48,469			48,469
Property and equipment	29,781			29,781
Business Acquisition, Purchase Price Allocation, Goodwill Amount	161,160			161,160
Business Combination, Liabilities Arising from Contingencies, Amount Recognized	-39,222			-39,222
Intangible assets	32,496			32,496
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	2,023			2,023
Other assets	62,731			62,731
Total assets	376,850			376,850
Accounts payable	17,830			17,830
Accrued expenses	52,935			52,935
Acquired contract liabilities, net	230,476			230,476
Total liabilities	301,241			301,241
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years
Business Acquisition, Cost of Acquired Entity, Cash Paid	75,609
Business Combination, Consideration Transferred, Other	6,000
Business Combination, Acquisition Related Costs	1,834
Insulfab [Member]
Acquisitions
Business Acquisition, Cost of Acquired Entity, Cash Paid				2,516	7,394
General Donlee Canada, Inc [Member]
Acquisitions
Business Acquisition, Integration, Restructuring and Other Related Costs [Text Block]	766
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables									10,573
Inventory									15,645
Prepaid expenses and other									184
Property and equipment									31,952
Business Acquisition, Purchase Price Allocation, Goodwill Amount									46,528
Intangible assets									24,596
Total assets									129,478
Accounts payable									2,841
Accrued expenses									3,620
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent									11,439
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt									54,956
Total liabilities									72,856
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					15 years
Business Acquisition, Cost of Acquired Entity, Cash Paid					56,622
Embee Incorporated [Member]
Acquisitions
Business Acquisition, Cost of Acquired Entity, Cash Paid	141,864
Business Combination, Acquisition Related Costs						805
Goodrich Pump & Engine Controls Systems [Member]
Acquisitions
Business Acquisition, Cost of Acquired Entity, Cash Paid	208,650
Business Combination, Acquisition Related Costs							2,936
Primus [Member]
Acquisitions
Cash										2,201
Business Acquisition, Purchase Price Allocation, Current Assets, Receivables										17,392
Inventory										21,053
Prepaid expenses and other										883
Property and equipment										28,457
Business Acquisition, Purchase Price Allocation, Goodwill Amount										29,138
Intangible assets										3,514
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets										13,138
Total assets										115,776
Accounts payable										10,027
Accrued expenses										15,939
Acquired contract liabilities, net										26,280
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt										30,000
Total liabilities										52,246
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life								16 years
Business Acquisition, Cost of Acquired Entity, Cash Paid								33,530
Business Combination, Acquisition Related Costs	743
Aerostructures
Acquisitions
Business Acquisition, Purchase Price Allocation, Goodwill Amount	1,415,700	1,339,993	1,316,450	1,415,700			1,339,993
Secured Debt [Member] | General Donlee Canada, Inc [Member]
Acquisitions
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt									32,382
Convertible Debt [Member] | General Donlee Canada, Inc [Member]
Acquisitions
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt									$26,000

DISCONTINUED_OPERATIONS_AND_AS1

DISCONTINUED OPERATIONS AND ASSETS HELD FOR SALE (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014
Triumph Aerospace Systems-Wichita [Member]
Discontinued operations and assets held for sale
Total Cash and Noncash Divestiture, Amount of Consideration Received	$23,000
Triumph Instruments [Member]
Discontinued operations and assets held for sale
Total Cash and Noncash Divestiture, Amount of Consideration Received	11,200
Proceeds from Divestiture of Businesses	9,676
Noncash or Part Noncash Divestiture, Amount of Consideration Received	1,500
Gain (Loss) on Disposition of Assets		$1,462

INVENTORIES_Details

INVENTORIES (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Inventory [Line Items]
Raw materials	$79,786	$106,552
Work-in-process	1,291,377	1,102,626
Finished goods	91,639	67,608
Less: unliquidated progress payments	-189,923	-165,019
Total inventories	1,272,879	1,111,767
Inventory, Net, Government Contacts	70,121	64,418
Preproduction Costs Related to Long-term Supply Arrangements, Costs Capitalized	306,983	131,358
Bombardier [Member]
Inventory [Line Items]
Preproduction Costs Related to Long-term Supply Arrangements, Costs Capitalized	238,871	111,906
Embraer [Member]
Inventory [Line Items]
Preproduction Costs Related to Long-term Supply Arrangements, Costs Capitalized	$68,112	$19,452

PROPERTY_AND_EQUIPMENT_PROPERT2

PROPERTY AND EQUIPMENT PROPERTY AND EQUIPMENT (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Property, Plant and Equipment [Line Items]
Land	$72,893	$74,835
Construction in process	53,475	68,904
Buildings and improvements	374,763	353,096
Furniture, fixtures and computer equipment	146,834	135,986
Machinery and equipment	945,317	841,441
Property, Plant and Equipment, Gross	1,593,282	1,474,262
Less accumulated depreciation	644,380	542,832
Property and equipment, net	948,902	931,430
Depreciation	108,347	117,553	93,848
Capitalized Computer Software, Gross	84,098	80,361
Capitalized Computer Software, Accumulated Amortization	$55,304	$43,793

GOODWILL_Details

GOODWILL (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Changes in the carrying value of goodwill
Balance at the beginning of the period	$1,791,891	$1,721,720
Goodwill recognized in connection with acquisitions	261,156	80,266
Purchase price adjustments		33
Effect of exchange rate changes and other	-22,453	-5
Balance at the end of the period	2,030,594	1,791,891
Aerostructures
Changes in the carrying value of goodwill
Balance at the beginning of the period	1,339,993	1,316,450
Goodwill recognized in connection with acquisitions	74,837	33,798
Purchase price adjustments		33
Effect of exchange rate changes and other	870	-165
Balance at the end of the period	1,415,700	1,339,993
Aerospace Systems
Changes in the carrying value of goodwill
Balance at the beginning of the period	395,912	349,284
Goodwill recognized in connection with acquisitions	161,160	46,468
Purchase price adjustments		0
Effect of exchange rate changes and other	-23,431	160
Balance at the end of the period	533,641	395,912
Aftermarket Services
Changes in the carrying value of goodwill
Balance at the beginning of the period	55,986	55,986
Goodwill recognized in connection with acquisitions	25,159	0
Purchase price adjustments		0
Effect of exchange rate changes and other	108	0
Balance at the end of the period	$81,253	$55,986

GOODWILL_AND_OTHER_INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS Schedule Of Finite-Lived And Indefinite-Lived Intangible Assets By Major Class (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	($214,538)	($166,512)
Intangible Assets (Excluding Goodwill), Gross	1,186,927	1,144,683
Intangible assets, net	972,389	978,171
Amortization of Intangible Assets	49,976	46,724	35,658
Future Amortization Expense, Year One	49,839
Future Amortization Expense, Year Two	43,624
Future Amortization Expense, Year Three	41,996
Future Amortization Expense, Year Four	40,230
Future Amortization Expense, Year Five	38,394
Future Amortization Expense, after Year Five	319,906
Customer Relationships [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life	16 years 6 months	16 years 8 months
Finite-Lived Intangible Assets, Gross	689,179	650,199
Finite-Lived Intangible Assets, Accumulated Amortization	-180,765	-136,970
Finite-Lived Intangible Assets, Net	508,414	513,229
Licensing Agreements [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life	11 years 9 months	11 years 8 months
Finite-Lived Intangible Assets, Gross	56,419	52,405
Finite-Lived Intangible Assets, Accumulated Amortization	-33,208	-28,437
Finite-Lived Intangible Assets, Net	23,211	23,968
Non-Compete Agreements and Other [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life	15 years 10 months	13 years 7 months
Finite-Lived Intangible Assets, Gross	2,929	3,679
Finite-Lived Intangible Assets, Accumulated Amortization	-565	-1,105
Finite-Lived Intangible Assets, Net	2,364	2,574
Trade Names [Member]
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$438,400	$438,400

ACCRUED_EXPENSES_ACCRUED_EXPEN1

ACCRUED EXPENSES ACCRUED EXPENSES (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Accrued Expenses [Line Items]
Product Warranty Accrual	$78,972	$25,651
Defined Benefit Pension Plan Liabilities, Current	3,940	3,960
Deferred Revenue, Current	32,210	20,428
Other Postretirement Defined Benefit Plan, Liabilities, Current	20,116	26,038
Employee-related Liabilities, Current	115,294	103,962
Interest Payable, Current	16,624	17,966
Product Warranty Accrual, Current	47,203	13,628
Workers' Compensation Liability, Current	16,500	15,010
Accrued Income Taxes, Current	2,516	796
Provision for Loss on Contracts	99,559	2,236
Business Acquisition, Preacquisition Contingency, Amount of Settlement	0	38,000
Other Accrued Liabilities, Current	72,806	31,266
Accrued expenses	427,740	273,290
Short-term Debt [Member]
Accrued Expenses [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	$972	$0

LEASES_LEASES_Details

LEASES LEASES (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Operating Lease Commitments by Year [Line Items]
Operating Leases, Future Minimum Payments Due, Current	$25,975
Operating Leases, Future Minimum Payments, Due in Two Years	22,839
Operating Leases, Future Minimum Payments, Due in Three Years	20,624
Operating Leases, Future Minimum Payments, Due in Four Years	17,907
Operating Leases, Future Minimum Payments, Due in Five Years	14,294
Operating Leases, Future Minimum Payments, Due Thereafter	50,914
Operating Leases, Rent Expense, Net	$34,762	$41,508	$38,349

LONGTERM_DEBT_Details

LONG-TERM DEBT (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2015
Long-term debt
Long-term debt	$1,550,383	$1,379,396
Less current portion	49,575	42,255
Long-term debt, Net	1,500,808	1,337,141
Revolving credit facility
Long-term debt
Long-term debt	194,406	148,255
Term loan credit agreement
Long-term debt
Long-term debt	375,000	356,250
Derivative Asset, Fair Value, Gross Asset	2,426	-2,743
Receivable securitization facility
Long-term debt
Long-term debt	162,400	100,000
Capital Lease Obligations [Member]
Long-term debt
Long-term debt	74,342	91,913
Senior subordinated notes due 2017
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage		8.00%
Senior notes due 2018
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage		8.63%
Long-term debt	348,423	0
Senior Notes due 2021 [Member]
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage		4.88%
Long-term debt	375,000	375,000
Senior Notes Due 2022 [Member]
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage		5.25%
Long-term debt	0	300,000
Convertible senior subordinated notes
Long-term debt
Debt Instrument, Convertible, Conversion Ratio	36.8679
Debt Instrument, Interest Rate, Stated Percentage		2.63%
Long-term debt	12,834	0
Other debt
Long-term debt
Long-term debt	7,978	7,978
Estimate of Fair Value Measurement [Member]
Long-term debt
Long-term debt	1,580,447	1,358,306
Reported Value Measurement [Member]
Long-term debt
Long-term debt	$1,550,383	$1,379,396

LONGTERM_DEBT_Details_2

LONG-TERM DEBT (Details 2) (USD $)	12 Months Ended			3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2015	Mar. 31, 2011
Long-term debt
Deferred Finance Costs, Noncurrent, Net	$17,850	$19,499		17,850
Payments of Financing Costs	6,487	3,297	8,838
Outstanding borrowing amount	1,379,396	1,550,383		1,379,396
Revolving credit facility
Long-term debt
Aggregate principal borrowing capacity	1,000,000			1,000,000
Accordion feature	250,000			250,000
Deferred Finance Costs, Noncurrent, Net		6,507
Payments of Financing Costs	2,795
Debt Instrument, Description of Variable Rate Basis	LIBOR
Outstanding borrowing amount	148,255	194,406		148,255
Letters of credit outstanding amount	35,384	36,445		35,384
Borrowing capacity under revolving credit facility after reductions for borrowings and letters of credit outstanding	816,361			816,361
Term loan credit agreement
Long-term debt
Outstanding borrowing amount	356,250	375,000		356,250
Receivable securitization facility
Long-term debt
Deferred Finance Costs, Noncurrent, Net	341			341
Payments of Financing Costs	252
Outstanding borrowing amount	100,000	162,400		100,000
Line of Credit Facility, Current Borrowing Capacity	225,000	175,000		225,000
Program fee on the amount outstanding (as a percent)	0.40%
Line of Credit Facility, Commitment Fee Percentage	0.40%
Percentage of line of credit on which commitment fees are charged (as a percent)	100.00%
Capital Lease Obligations [Member]
Long-term debt
Outstanding borrowing amount	91,913	74,342		91,913
Capital lease obligations entered into to finance capital additions	52	36	66
Debt Instrument, Term	7 years
Debt, Weighted Average Interest Rate					6.20%
Fixed Asset Financing [Member]
Long-term debt
Capital lease obligations entered into to finance capital additions	$37,608	$30,503	$14,435
Minimum [Member] | Revolving credit facility
Long-term debt
Debt Instrument, Basis Spread on Variable Rate				1.38%
Commitment fees (as a percent)	0.25%
Maximum [Member] | Revolving credit facility
Long-term debt
Debt Instrument, Basis Spread on Variable Rate				2.50%
Commitment fees (as a percent)	0.45%

LONGTERM_DEBT_Details_3

LONG-TERM DEBT (Details 3) (USD $)	1 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2007	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Sep. 18, 2006
		trading_days
Long-term debt
Payments of Financing Costs		$6,487	$3,297	$8,838
Net proceeds from sale of notes		508,960	451,003	528,135
Repayments of Convertible Debt		12,834	96,535	19,286
Shares issued to settle the conversion benefit of the notes (in shares)		0	2,290,755	395,269
Additional number of shares included in diluted earning per share calculation (in shares)		40,000	811,000	2,401,000
Senior subordinated notes due 2017
Long-term debt
Debt instrument principal amount		175,000
Debt Instrument, Future Redemption Price as Percentage of Original Principal in Fifth Year		104.00%
Debt Instrument, Interest Rate, Stated Percentage		8.00%
Proceeds from loan, percentage of principal (as a percent)					98.56%
Payments of Financing Costs					4,390
Gain on early extinguishment of debt		11,069
Effective interest yield on principal amount (as a percent)		8.25%
Senior notes due 2018
Long-term debt
Debt instrument principal amount			350,000
Debt Instrument, Future Redemption Price as Percentage of Original Principal in Fifth Year		105.00%
Debt Instrument, Interest Rate, Stated Percentage		8.63%
Proceeds from loan, percentage of principal (as a percent)				99.27%
Payments of Financing Costs				7,307
Gain on early extinguishment of debt		22,615
Effective interest yield on principal amount (as a percent)			8.75%
Senior Notes due 2021 [Member]
Long-term debt
Debt instrument principal amount		375,000
The maximum percentage of the principal amounts of the debt instrument which the entity may redeem (as a percent)		35.00%
Debt Instrument, Interest Rate, Stated Percentage		4.88%
Proceeds from loan, percentage of principal (as a percent)				100.00%
Payments of Financing Costs				6,327
Effective interest yield on principal amount (as a percent)		4.88%
Asset sales redemption price, percentage of principal (as a percent)		100.00%
Percentage of principal amount that the holder of the note may require the entity to repurchase due to a fundamental change undergone by the entity, subject to certain conditions (as a percent)		101.00%
The limit of the principal amount of the debt instrument which the entity may redeem (as a percent)		104.88%
Convertible senior subordinated notes
Long-term debt
Debt instrument principal amount						201,250
Contingent interest rate per annum calculated on the average trading price for the relevant five day trading period (as a percent)		0.25%
Trading period used to determine payment of contingent interest (in days)		5
Debt Instrument, Interest Rate, Stated Percentage		2.63%
Payments of Financing Costs	6,252
Principal amount of debt purchased					22,200
Percentage of principal amount which triggers payment of contingent interest if it occurs over the specified trading period (as a percent)		120.00%
Percentage of principal amount that the holder of the note may require the entity to repurchase the debt instrument on October 1, 2011, 2016, and 2021 (as a percent)			100.00%
Net proceeds from sale of notes	194,998
Repayments of Convertible Debt					19,414
Debt Instrument, Repurchase Option Percentage of Original Principal			100.00%
Number of common stock shares per $1,000 principal amount of the convertible notes (in shares)			36.8679
Principal amount of notes which are convertible into shares of common stock			$1
Conversion price (in dollars per share)		$27.12
Average price of common stock (in dollars per share)		$65.11	$73.94	$64.30
Additional number of shares included in diluted earning per share calculation (in shares)		40,177	811,083	2,400,439

LONGTERM_DEBT_LONGTERM_DEBT_De

LONG-TERM DEBT LONG-TERM DEBT (Details 4) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Long-term debt
Repayments of Convertible Debt	$12,834	$96,535	$19,286
Payments of Financing Costs	6,487	3,297	8,838
Debt and Capital Lease Obligations	1,379,396	1,550,383
Interest Paid	82,425	81,100	62,229
Interest Costs, Capitalized During Period	284	4,246	1,114
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	42,255
Long-term Debt, Maturities, Repayments of Principal in Year Two	36,805
Long-term Debt, Maturities, Repayments of Principal in Year Three	294,284
Long-term Debt, Maturities, Repayments of Principal in Year Four	299,354
Long-term Debt, Maturities, Repayments of Principal in Year Five	11,008
Long-term Debt, Maturities, Repayments of Principal after Year Five	695,691
Senior Notes [Member]
Long-term debt
Debt instrument principal amount		350,000
Debt Instrument, Future Redemption Price as Percentage of Original Principal in Fifth Year	105.00%
Gains (Losses) on Extinguishment of Debt	-22,615
Debt Instrument, Interest Rate, Stated Percentage	8.63%
Payments of Financing Costs			7,307
Effective interest yield on principal amount (as a percent)		8.75%
Debt and Capital Lease Obligations	0	348,423
Senior Notes Due 2022 [Member]
Long-term debt
Debt instrument principal amount	300,000
Debt Instrument, Interest Rate, Stated Percentage	5.25%
Payments of Financing Costs			4,990
The maximum percentage of the principal amounts of the debt instrument which the entity may redeem (as a percent)	35.00%
The limit of the principal amount of the debt instrument which the entity may redeem (as a percent)	105.25%
Percentage of principal amount that the holder of the note may require the entity to repurchase due to a fundamental change undergone by the entity, subject to certain conditions (as a percent)	101.00%
Asset sales redemption price, percentage of principal (as a percent)	100.00%
Effective interest yield on principal amount (as a percent)	5.25%
Debt and Capital Lease Obligations	300,000	0
Fixed Asset Financing [Member]
Long-term debt
Capital Lease Obligations Incurred	37,608	30,503	14,435
Secured Debt [Member]
Long-term debt
Debt and Capital Lease Obligations	356,250	375,000
Derivative Asset, Fair Value, Gross Asset	-2,743	2,426
Receivable securitization facility
Long-term debt
Payments of Financing Costs	252
Debt and Capital Lease Obligations	100,000	162,400
Line of Credit Facility, Current Borrowing Capacity	$225,000	$175,000

OTHER_NONCURRENT_LIABILITIES_O1

OTHER NONCURRENT LIABILITIES OTHER NONCURRENT LIABILITIES (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Business Acquisition [Line Items]
Acquired contract liabilities, net	$644,950	$141,505
Deferred Revenue and Credits, Noncurrent	20,354	21,905
Workers' Compensation Liability, Noncurrent	15,657	18,077
Accrued Environmental Loss Contingencies, Noncurrent	8,638	9,959
Product Warranty Accrual, Noncurrent	31,769	12,022
Accrued Income Taxes, Noncurrent	3,690	3,196
Unrecognized Tax Benefits	8,348	8,865
Other noncurrent liabilities	19,495	16,852
Liabilities, Noncurrent	754,053	234,756
Business Acquisition, Preacquisition Contingency, Amount of Settlement	0	38,000
Other Noncurrent Liabilities [Member]
Business Acquisition [Line Items]
Business Acquisition, Preacquisition Contingency, Amount of Settlement	9,500	9,500
Long-term Debt [Member]
Business Acquisition [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	$0	$1,740

INCOME_TAXES_SUMMARY_OF_PRETAX

INCOME TAXES SUMMARY OF PRETAX INCOME BY JURISDICTION (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Tax Examination [Line Items]
Income (loss) from continuing operations, before income taxes	$349,294	$312,233	$463,057
Foreign Country [Member]
Income Tax Examination [Line Items]
Income (loss) from continuing operations, before income taxes	-429	3,482	11,829
Domestic Country [Member]
Income Tax Examination [Line Items]
Income (loss) from continuing operations, before income taxes	$349,723	$308,751	$451,228

INCOME_TAXES_COMPONENTS_OF_INC

INCOME TAXES COMPONENTS OF INCOME TAX PROVISION (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$391	$672	($24,403)
Current State and Local Tax Expense (Benefit)	178	1,346	1,830
Current Foreign Tax Expense (Benefit)	4,751	1,090	1,516
Current Income Tax Expense (Benefit)	5,320	3,108	-21,057
Deferred Federal Income Tax Expense (Benefit)	114,260	100,191	176,187
Deferred State and Local Income Tax Expense (Benefit)	-1,857	3,102	10,789
Deferred Foreign Income Tax Expense (Benefit)	-7,126	-424	-209
Deferred Income Tax Expense (Benefit)	105,277	102,869	186,767
Income tax expense	$110,597	$105,977	$165,710

INCOME_TAXES_EFFECTIVE_INCOME_

INCOME TAXES EFFECTIVE INCOME TAX RATE RECONCILIATION (Details)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes	0.50%	0.90%	1.80%
Effective Income Tax Rate Reconciliation, Nondeductible Expense	-0.70%	0.50%	-0.30%
Effective Income Tax Rate Reconciliation, Tax Credits, Research	-1.90%	-1.80%	-1.10%
Effective Income Tax Rate Reconciliation, Tax Credits, Foreign	-0.20%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments	-1.00%	-0.70%	0.40%
Effective income tax rate (as a percent)	31.70%	33.90%	35.80%

INCOME_TAXES_DETAIL_OF_DEFERRE

INCOME TAXES DETAIL OF DEFERRED TAX ASSETS AND LIABILITIES (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	$186,172	$196,599
Deferred Tax Assets, Inventory	2,987	6,687
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals	39,041	34,339
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pension and Other Postretirement Benefits	186,806	186,941
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	146,515	48,500
Deferred Tax Assets, Other	0	737
Deferred Tax Assets, Gross	561,521	473,803
Deferred Tax Assets, Valuation Allowance	-1,472	-1,424
Deferred Tax Assets, Net	560,049	472,379
Deferred Tax Liabilities, Deferred Expense, Capitalized Inventory Costs	311,521	317,377
Deferred Tax Liabilities, Property, Plant and Equipment	144,681	141,854
Deferred Tax Liabilities, Goodwill and Intangible Assets	342,794	333,889
Deferred Tax Liabilities, Other	4,228	7,139
Deferred Tax Liabilities	803,224	800,259
Deferred Tax Liabilities, Net	($243,175)	($327,880)

INCOME_TAXES_ROLLFORWARD_OF_UN

INCOME TAXES ROLLFORWARD OF UNCERTAIN TAX POSITIONS (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Tax Contingency [Line Items]
Liability for Uncertain Tax Positions, Noncurrent	$8,826	$9,293
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	774
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	1,475
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	-666
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	0
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	$0

INCOME_TAXES_Details

INCOME TAXES (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Tax Contingency [Line Items]
Effective income tax rate (as a percent)	31.70%	33.90%	35.80%
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount	$1,051
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward	367
Income Tax Holiday, Aggregate Dollar Amount	347	1,930	1,549
Income Tax Holiday, Income Tax Benefits Per Share	$0.00	$0.00	$0.00
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability	27,747
Total accrued income tax related interest and penalties	207	204
Unrecognized Tax Benefits	8,348	8,865
Deferred Tax Assets, Operating Loss Carryforwards	186,172	196,599
Amount of unrecognized tax benefits that would impact the effective tax rate, if recognized	8,348	8,865
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit		0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	4	32	3
Domestic Country [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards	919,503
Foreign Country [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards	$71,765

STOCKHOLDERS_EQUITY_STOCKHOLDE

STOCKHOLDERS' EQUITY STOCKHOLDERS' EQUITY (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	21-May-15
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Preferred Stock, Shares Authorized	250,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	5,000,000	500,800
Treasury Stock, Shares, Acquired	-2,923,011	-300,000
Treasury Stock, Value, Acquired, Cost Method	$184,380,000	$19,134,000
Stock Repurchased During Period, Value	184,380,000
Preferred Stock, Shares Outstanding	0
Stock Repurchase Program, Remaining Authorized Repurchase Amount				2,277,789
Repayments of convertible debt	12,834,000	96,535,000	19,286,000
Accumulated other comprehensive (loss) income	-198,910,000	-18,908,000	-60,972,000
Stock Issued During Period, Shares, Conversion of Convertible Securities	0	2,290,755	395,269
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	-46,949,000	-3,315,000
Common Stock, Voting Rights	1
Preferred Stock, Par or Stated Value Per Share	$0.01
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	-4,098,000	1,384,000	41,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	-155,000	-19,000	-42,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	-6,288,000	-1,963,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	-173,714,000	44,027,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	0	0
Other Comprehensive Income (Loss), Net of Tax	-180,002,000	42,064,000	-51,666,000
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Tax	0	5,647,000	119,000
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income	-2,757,000	1,496,000	131,000
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	-4,253,000	1,365,000
Treasury Stock [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Treasury Stock, Value, Acquired, Cost Method	184,380,000	19,134,000
Accumulated Translation Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Net of Tax	-46,949,000	-3,315,000
Accumulated Other Comprehensive Income (Loss), before Tax	-46,751,000	198,000	3,513,000
Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income	-149,402,000	-20,602,000	-64,616,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	-6,133,000	-1,944,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	-122,667,000	45,958,000
Other Comprehensive Income (Loss), Net of Tax	($128,800,000)	$44,014,000

EARNINGS_PER_SHARE_Details

EARNINGS PER SHARE (Details)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Weighted-average common shares outstanding-basic (in shares)	50,796	51,711	49,663
Net effect of dilutive stock options (in shares)	169	265	382
Potential common shares - convertible debt (in shares)	40	811	2,401
Weighted average common shares outstanding - diluted (in shares)	51,005	52,787	52,446

PENSION_AND_OTHER_POSTRETIREME2

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details) (USD $)	12 Months Ended			3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2014	Mar. 31, 2014	Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Description of Defined Contribution Pension and Other Postretirement Plans	The Company generally matches contributions up to 60% of the first 6% of compensation contributed by the participant, calculated as 100% of the first 2% contributed, plus 40% of the next 4% contributed
Defined Benefit Plan, Contributions by Employer	$20,020	$21,208	$19,509
Age healthcare premiums are charged to retirees	65					65
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	-1,166	-34,481
Defined Benefit Plan, Expected Future Benefit Payments, Number of Years	10
Defined Benefit Plan, Assumption, Number of Basis Point Sensitivity, Discount Rate	25					25
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	6.80%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	4.50%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2027					2027
Defined Benefit Plan, Effect of Change in Healthcare Cost Trade Rate (as a percent)	1.00%
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	112,338	46,347
Defined Benefit Plan, Plan Amendments	-50	58		-118,391
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	0	1,561	0
Defined Benefit Plan, Curtailments	0	-7,851
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	-395	23,662		1,819
Defined Benefit Plan, Special Termination Benefits	0	0	10,819
Defined Benefit Plan, Expected Future Benefit Payments in Year One	181,617					181,617
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	174,814					174,814
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	171,769					171,769
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	167,056					167,056
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	165,079					165,079
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	784,000					784,000
Defined Benefit Plan, Effect of a 25 Basis Point Increase in Discount Rate, Obligation	-72,900					-72,900
Defined Benefit Plan, Effect of a 25 Basis Point Increase in Discount Rate, Net Periodic Benefit Cost		-800
Defined Benefit Plan, Effect of a 25 Basis Point Decrease in Discount Rate, Obligation	76,600					76,600
Defined Benefit Plan, Effect of a 25 Basis Point Decrease in Discount Rate, Net Periodic Benefit Cost		600
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	40,000
Represented Employee Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Amendments		-5,682				-6,503
Defined Benefit Plan, Curtailments		2,030
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments		21,843				8,031
Defined Benefit Plan, Special Termination Benefits		1,150
Severance Costs						916
Other postretirement
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	25,684	30,077
Defined Benefit Plan, Plan Amendments	0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	0	0	0
Defined Benefit Plan, Curtailments	0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	0	0
Defined Benefit Plan, Special Termination Benefits	0	0	0
Defined Benefit Plan, Expected Future Benefit Payments in Year One		20,482			20,482
Defined Benefit Plan, Expected Future Benefit Payments in Year Two		19,714			19,714
Defined Benefit Plan, Expected Future Benefit Payments in Year Three		19,083			19,083
Defined Benefit Plan, Expected Future Benefit Payments in Year Four		19,022			19,022
Defined Benefit Plan, Expected Future Benefit Payments in Year Five		18,373			18,373
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter		81,210			81,210
Defined Benefit Plan, Effect of a 25 Basis Point Increase in Discount Rate, Obligation	-5,407					-5,407
Defined Benefit Plan, Effect of a 25 Basis Point Increase in Discount Rate, Net Periodic Benefit Cost	414
Defined Benefit Plan, Effect of a 25 Basis Point Decrease in Discount Rate, Obligation	5,644					5,644
Defined Benefit Plan, Effect of a 25 Basis Point Decrease in Discount Rate, Net Periodic Benefit Cost	-431
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components	453
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components	-403
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	8,142
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	-7,225
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	20,400
Non-Represented Employee Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Amendments						-14,355
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements				1,561
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments						8,427
Defined Benefit Plan, Special Termination Benefits		1,957
Severance Costs		1,182
Prior Service Cost [Member] | Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	-5,278
Other Comprehensive Income (Loss), Tax	3,297
Prior Service Cost [Member] | Other postretirement
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	-4,530
Other Comprehensive Income (Loss), Tax	2,830
Actuarial Loss (Gain) [Member] | Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	-10,521	6,460
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Prescription Drug Subsidy Receipts, Next Twelve Months	930					930
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Prescription Drug Subsidy Receipts, Next Twelve Months	$1,460					$1,460

PENSION_AND_OTHER_POSTRETIREME3

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS CHANGE IN PROJECTED BENEFIT OBLIGATION AND PLAN ASSETS (Details) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		$2,156,148,000	$1,933,269,000
Defined Benefit Plan, Contributions by Employer		20,020,000	21,208,000	19,509,000
Accrued pension and other postretirement benefits, noncurrent		-538,381,000	-508,524,000
Other postretirement
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation		239,267,000	311,012,000	347,555,000
Defined Benefit Plan, Service Cost		2,868,000	3,060,000	3,538,000
Defined Benefit Plan, Interest Cost		12,332,000	12,552,000	15,762,000
Defined Benefit Plan, Actuarial Gain (Loss)		-61,261,000	-22,078,000
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation		0	0
Defined Benefit Plan, Plan Amendments		0	0
Defined Benefit Plan, Contributions by Plan Participants		3,339,000	6,449,000
Defined Benefit Plan, Curtailments		0	0
Defined Benefit Plan, Settlements, Benefit Obligation		0	0
Defined Benefit Plan, Special Termination Benefits		0	0	0
Defined Benefit Plan, Benefits Paid		-29,023,000	-36,526,000
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets		0	0
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)		0	0
Defined Benefit Plan, Accumulated Benefit Obligation		239,267,000	311,012,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		3.66%	4.14%
Defined Benefit Plan, Fair Value of Plan Assets		0	0	0
Defined Benefit Plan, Actual Return on Plan Assets		0	0
Defined Benefit Plan, Settlements, Plan Assets		0	0
Defined Benefit Plan, Contributions by Employer		25,684,000	30,077,000
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets		0	0
Defined Benefit Plan, Funded Status of Plan		-239,267,000	-311,012,000
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent		0	0
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities		-20,116,000	-26,038,000
Accrued pension and other postretirement benefits, noncurrent		-219,151,000	-284,974,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax		-8,682,000	-13,211,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax		-74,615,000	-13,354,000
Deferred Tax Assets, Other Comprehensive Loss		31,265,000	9,968,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		-52,032,000	-16,597,000
Pension benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Benefit Obligation		2,479,319,000	2,160,708,000	2,390,201,000
Defined Benefit Plan, Service Cost		12,902,000	12,854,000	18,503,000
Defined Benefit Plan, Interest Cost		90,576,000	92,938,000	98,348,000
Defined Benefit Plan, Actuarial Gain (Loss)		341,719,000	-24,361,000
Defined Benefit Plan, Business Combinations and Acquisitions, Benefit Obligation		39,575,000	13,324,000
Defined Benefit Plan, Plan Amendments	-118,391,000	-50,000	58,000
Defined Benefit Plan, Contributions by Plan Participants		145,000	0
Defined Benefit Plan, Curtailments		0	-7,851,000
Defined Benefit Plan, Settlements, Benefit Obligation		0	171,450,000
Defined Benefit Plan, Special Termination Benefits		0	0	10,819,000
Defined Benefit Plan, Benefits Paid		-158,638,000	-144,078,000
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets		-7,399,000	-910,000
Defined Benefit Plan, Foreign Currency Exchange Rate Gain (Loss)		-7,718,000	927,000
Defined Benefit Plan, Accumulated Benefit Obligation		2,464,418,000	2,148,824,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		3.78%	4.32%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase		3.50%	3.50%
Defined Benefit Plan, Fair Value of Plan Assets		2,156,148,000	1,933,269,000	2,030,210,000
Defined Benefit Plan, Actual Return on Plan Assets		236,782,000	160,297,000
Defined Benefit Plan, Settlements, Plan Assets		0	171,450,000
Defined Benefit Plan, Contributions by Employer		112,338,000	46,347,000
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets		39,651,000	12,853,000
Defined Benefit Plan, Funded Status of Plan		-323,171,000	-227,439,000
Defined Benefit Plan, Assets for Plan Benefits, Noncurrent		0	71,000
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities		-3,940,000	-3,960,000
Accrued pension and other postretirement benefits, noncurrent		-319,231,000	-223,550,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax		-20,155,000	-25,493,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax		340,034,000	85,076,000
Deferred Tax Assets, Other Comprehensive Loss		-118,445,000	-22,384,000
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		$201,434,000	$37,199,000

PENSION_AND_OTHER_POSTRETIREME4

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS NET PERIODIC BENEFIT COST (Details) (USD $)	12 Months Ended			3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	$0	($1,166)	($34,481)
Represented Employee Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments		21,843		8,031
Defined Benefit Plan, Special Termination Benefits		1,150
Defined Benefit Plan, Plan Amendments		5,682		6,503
Pension benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Service Cost	12,902	12,854	18,503
Defined Benefit Plan, Interest Cost	90,576	92,938	98,348
Defined Benefit Plan, Expected Return on Plan Assets	150,565	147,545	137,334
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	-5,288	-6,731	-5,829
Defined Benefit Plan, Amortization of Gains (Losses)	0	-13,487	-318
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	-395	23,662			1,819
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	0	-1,561	0
Defined Benefit Plan, Special Termination Benefits	0	0	10,819
Defined Benefit Plan, Net Periodic Benefit Cost	-52,375	-33,831	8,487
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.32%	4.07%	4.62%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	8.25%	8.25%	8.25%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.50%	3.50%	3.50%
Defined Benefit Plan, Plan Amendments	50	-58			118,391
Other postretirement
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Service Cost	2,868	3,060	3,538
Defined Benefit Plan, Interest Cost	12,332	12,552	15,762
Defined Benefit Plan, Expected Return on Plan Assets	0	0	0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	-4,529	-4,529	-4,529
Defined Benefit Plan, Amortization of Gains (Losses)	0	0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	0	0	0
Defined Benefit Plan, Special Termination Benefits	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost	10,671	11,083	14,771
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.14%	3.79%	4.35%
Defined Benefit Plan, Plan Amendments	$0	$0

PENSION_AND_OTHER_POSTRETIREME5

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS BENEFIT PLAN ASSETS (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	$0	($1,166,000)	($34,481,000)
Defined Benefit Plan, Fair Value of Plan Assets	2,156,148,000	1,933,269,000
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	80,612,000
Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage	2 - 10%
Defined Benefit Plan, Actual Plan Asset Allocations	4.00%	5.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	93,061,000	27,066,000
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	91,499,000	26,261,000
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,562,000	805,000
Cash and Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	181,061,000	196,008,000
International Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	181,061,000	196,008,000
International Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
International Equity Securities [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	72,911,000	70,520,000
Defined Benefit Plan, Target Allocation Percentage	50 - 65%
Defined Benefit Plan, Actual Plan Asset Allocations	45.00%	47.00%
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	72,911,000	70,520,000
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Equity Securities [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage	20 - 45%
Defined Benefit Plan, Actual Plan Asset Allocations	51.00%	48.00%
Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	619,297,000	563,116,000
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	619,297,000	563,116,000
Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Equity Funds [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Equity Funds, Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	115,531,000	69,076,000
Equity Funds, Foreign [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	47,366,000	26,579,000
Equity Funds, Foreign [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	68,165,000	42,497,000
Equity Funds, Foreign [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
All Other Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	25,604,000	19,628,000
All Other Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
All Other Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	25,604,000	19,628,000
All Other Corporate Bonds [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
US Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	182,456,000	163,241,000
US Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
US Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	182,456,000	163,241,000
US Government Debt Securities [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	766,898,000	724,601,000
Fixed Income Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	676,557,000	636,476,000
Fixed Income Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	90,341,000	88,125,000
Fixed Income Funds [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Collateralized Mortgage Backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8,415,000	8,362,000
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8,415,000	8,362,000
Collateralized Mortgage Backed Securities [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Private Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	79,692,000	89,113,000
Private Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Private Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Private Equity Funds [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	79,692,000	89,113,000	95,015,000
Investment [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	2,159,532,000	1,930,731,000
Investment [Domain] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	1,698,865,000	1,518,960,000
Investment [Domain] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	380,055,000	322,658,000
Investment [Domain] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	80,612,000	89,113,000
Accounts Receivable [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	2,609,000	2,568,000
Accounts Payable [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	($5,993,000)	($30,000)

PENSION_AND_OTHER_POSTRETIREME6

PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS ROLLFORWARD OF LEVEL 3 ASSETS (Details) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$2,156,148,000	$1,933,269,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	12,338,000
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	80,612,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issuances, Settlements	920,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	-1,002,000
Private Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	79,692,000	89,113,000
Private Equity Funds [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	79,692,000	89,113,000	95,015,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issuances, Settlements	0	-18,976,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	-20,757,000	11,157,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	-1,002,000	1,917,000
Insurance Contracts [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	920,000	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issuances, Settlements	920,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	$0

STOCK_COMPENSATION_PLANS_STOCK1

STOCK COMPENSATION PLANS STOCK COMPENSATION PLANS (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation	$1,272	$4,653	$6,367
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	3,936	49,718
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$15.37	$15.72
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	-45,782	-18,170	-128,356
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$15.72
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	0 years 1 month
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	195,777
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	3,936
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$15.37
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term	0 years 1 month
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	195,777
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	2,234	1,043	6,281
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	2,218,427	2,227,227
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	175,382	271,211
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$61.79	$59.37
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	8,800
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$64.44	$79.80	$62.25
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	-103,129
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$55.49
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	-1,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value	$72.76
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	9,157
Adjustments Related to Tax Withholding for Share-based Compensation	673	2,726	1,840
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	1,188
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 4 months
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$445	$1,629	$2,228
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	8,800	7,875	17,000

COMMITMENTS_AND_CONTINGENCIES_

COMMITMENTS AND CONTINGENCIES Commitments and Contingencies (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2015
Gain Contingencies [Line Items]
Proceeds from Legal Settlements	$0	$0
Eaton Case - Gross Settlement [Member]
Gain Contingencies [Line Items]
Proceeds from Legal Settlements			135,300
Eaton Case - Net Settlement [Member]
Gain Contingencies [Line Items]
Proceeds from Legal Settlements			($134,693)

RELOCATION_COSTS_RELOCATION_CO1

RELOCATION COSTS RELOCATION COSTS (Details) (Facility Closing [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Property, Plant and Equipment, Additions	$86,640
Relocation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Business Exit Costs	$3,193

FAIR_VALUE_MEASUREMENTS_Detail

FAIR VALUE MEASUREMENTS (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-Lived Assets	$366,846	$289,027
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	($4,098)	$1,384	$41

FAIR_VALUE_MEASUREMENTS_Detail1

FAIR VALUE MEASUREMENTS (Details 2) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Thousands, unless otherwise specified
Carrying amounts and related estimated fair values of financial instruments not recorded at fair value in financial statements
Long-term debt	$1,379,396	$1,550,383
Carrying Value
Carrying amounts and related estimated fair values of financial instruments not recorded at fair value in financial statements
Long-term debt	1,379,396	1,550,383
Estimate of Fair Value, Fair Value Disclosure [Member]
Carrying amounts and related estimated fair values of financial instruments not recorded at fair value in financial statements
Long-term debt	$1,358,306	$1,580,447

CUSTOMER_CONCENTRATION_CUSTOME

CUSTOMER CONCENTRATION CUSTOMER CONCENTRATION (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Concentration of Credit Risk
Net sales	$1,080,277	$917,417	$994,123	$896,905	$936,410	$915,816	$967,345	$943,683	$3,888,722	$3,763,254	$3,702,702
Trade Accounts Receivable [Member] | Credit Concentration Risk [Member]
Concentration of Credit Risk
Concentration Risk, Percentage									13.00%	32.00%
Net sales
Concentration of Credit Risk
Concentration Risk, Percentage									42.00%	45.00%	49.00%
Net sales									1,634,367	1,689,635	1,829,200
Concentration Risk, Customer									0.1
Aerostructures
Concentration of Credit Risk
Net sales	704,478	559,465	632,072	611,863	632,601	637,202	690,748	651,888	2,507,878	2,612,439	2,781,344
Aerostructures | Net sales
Concentration of Credit Risk
Net sales									1,441,892	1,576,113	1,719,485
Aerospace Systems
Concentration of Credit Risk
Net sales	301,165	279,198	288,902	219,852	235,339	211,402	205,483	219,526	1,089,117	871,750	615,771
Aerospace Systems | Net sales
Concentration of Credit Risk
Net sales									161,196	87,374	73,794
Aftermarket Services
Concentration of Credit Risk
Net sales	81,372	80,690	74,343	67,608	70,463	69,556	72,971	74,353	304,013	287,343	314,507
Aftermarket Services | Net sales
Concentration of Credit Risk
Concentration Risk, Percentage									7.00%
Net sales									$31,279	$26,148	$35,921

COLLECTIVE_BARGAINING_AGREEMEN1

COLLECTIVE BARGAINING AGREEMENTS COLLECTIVE BARGAINING AGREEMENTS (Details)	12 Months Ended
	Mar. 31, 2015
Unionized Employees Concentration Risk [Member]
Concentration of Credit Risk
Concentration Risk, Percentage	19.00%
Unionized Employees Concentration Risk Expire Within One Year [Member]
Concentration of Credit Risk
Concentration Risk, Percentage	42.00%

SEGMENTS_Details

SEGMENTS (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Financial information of reportable segment and the reconciliation of EBITDA to operating income
Reporting Segments Number										3
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments									$0	($1,166)	($34,481)
Net sales	1,080,277	917,417	994,123	896,905	936,410	915,816	967,345	943,683	3,888,722	3,763,254	3,702,702
Operating income (loss)	140,717	-61,266	114,698	240,524	80,908	84,779	92,971	141,346	434,673	400,004	531,213
Interest expense and other									85,379	87,771	68,156
Income (loss) from continuing operations, before income taxes									349,294	312,233	463,057
Depreciation and amortization									158,323	164,277	129,506
Amortization of Acquired Contract Liabilities									75,733	42,629	25,644
Adjusted EBITDA									382,570	522,818	669,556
Capital expenditures									110,004	206,414	126,890
Total assets	6,069,443				5,553,386				6,069,443	5,553,386
Foreign sales									753,075	621,625	504,079
Disclosure on Geographic Areas, Long-Lived Assets in Foreign Countries	366,846				289,027				366,846	289,027
Aerostructures
Financial information of reportable segment and the reconciliation of EBITDA to operating income
Net sales	704,478	559,465	632,072	611,863	632,601	637,202	690,748	651,888	2,507,878	2,612,439	2,781,344
Operating income (loss)	86,861	-102,461	72,230	70,866	35,686	52,412	64,425	100,387	127,495	252,910	469,873
Depreciation and amortization									100,096	114,302	95,884
Amortization of Acquired Contract Liabilities									38,719	25,207	25,457
Adjusted EBITDA									188,872	342,005	540,300
Capital expenditures									72,242	167,198	90,466
Total assets	4,004,642				3,880,645				4,004,642	3,880,645
Aerospace Systems
Financial information of reportable segment and the reconciliation of EBITDA to operating income
Net sales	301,165	279,198	288,902	219,852	235,339	211,402	205,483	219,526	1,089,117	871,750	615,771
Operating income (loss)	58,612	41,863	46,214	37,352	42,834	32,504	31,740	42,643	184,042	149,721	103,179
Depreciation and amortization									45,200	37,453	19,870
Amortization of Acquired Contract Liabilities									37,014	17,422	187
Adjusted EBITDA									192,228	169,752	122,862
Capital expenditures									30,531	21,935	19,388
Total assets	1,474,362				1,255,136				1,474,362	1,255,136
Aftermarket Services
Financial information of reportable segment and the reconciliation of EBITDA to operating income
Net sales	81,372	80,690	74,343	67,608	70,463	69,556	72,971	74,353	304,013	287,343	314,507
Operating income (loss)	13,317	12,490	11,620	10,504	11,587	9,297	10,102	11,279	47,931	42,265	45,380
Depreciation and amortization									8,559	7,529	9,118
Adjusted EBITDA									56,490	49,794	54,498
Capital expenditures									5,645	13,940	14,820
Total assets	375,786				316,643				375,786	316,643
Elimination of inter-segment sales
Financial information of reportable segment and the reconciliation of EBITDA to operating income
Net sales	-6,738	-1,936	-1,194	-2,418	-1,993	-2,344	-1,857	-2,084	-12,286	-8,278	-8,920
Operating income (loss)	-18,073	-13,158	-15,366	121,802	-9,199	-9,434	-13,296	-12,963
Corporate
Financial information of reportable segment and the reconciliation of EBITDA to operating income
Operating income (loss)									75,205	-44,892	-87,219
Depreciation and amortization									4,468	4,993	4,634
Adjusted EBITDA									-55,020	-38,733	-48,104
Capital expenditures									1,586	3,341	2,216
Total assets	$214,653				$100,962				$214,653	$100,962

SELECTED_CONSOLIDATING_FINANCI2

SELECTED CONSOLIDATING FINANCIAL STATEMENTS OF PARENT, GUARANTORS AND NON-GUARANTORS (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$32,617	$28,998	$32,037	$29,662
Trade and other receivables, net	521,846	517,304
Inventories	1,272,879	1,111,767
Rotable assets	48,820	41,666
Deferred Tax Assets, Net, Current	145,352	57,308
Prepaid and other current assets	23,100	24,897
Total current assets	2,044,614	1,781,940
Property and equipment, net	948,902	931,430
Goodwill and other intangible assets, net	3,002,983	2,770,062
Other, net	72,944	69,954
Intercompany investments and advances	0	0
Total assets	6,069,443	5,553,386
Current liabilities:
Current portion of long-term debt	42,255	49,575
Accounts payable	427,448	317,334
Accrued expenses	427,740	273,290
Total current liabilities	897,443	640,199
Long-term debt, less current portion	1,337,141	1,500,808
Intercompany debt	0	0
Accrued pension and other postretirement benefits, noncurrent	538,381	508,524
Deferred income taxes and other	1,160,694	619,944
Total stockholders' equity	2,135,784	2,283,911	2,045,158	1,793,369
Total liabilities and stockholders' equity	6,069,443	5,553,386
Parent
Current assets:
Cash and cash equivalents	620	2,820	3,110	7,969
Trade and other receivables, net	3,578	1,591
Inventories	0	0
Rotable assets	0	0
Deferred Tax Assets, Net, Current	0	0
Prepaid and other current assets	6,509	6,977
Total current assets	10,707	11,388
Property and equipment, net	8,209	9,933
Goodwill and other intangible assets, net	0	0
Other, net	24,601	58,536
Intercompany investments and advances	4,062,058	4,094,443
Total assets	4,105,575	4,174,300
Current liabilities:
Current portion of long-term debt	19,024	31,844
Accounts payable	8,919	1,150
Accrued expenses	38,275	36,034
Total current liabilities	66,218	69,028
Long-term debt, less current portion	1,166,095	1,279,694
Intercompany debt	719,525	525,216
Accrued pension and other postretirement benefits, noncurrent	7,517	6,795
Deferred income taxes and other	10,435	9,656
Total stockholders' equity	2,135,785	2,283,911
Total liabilities and stockholders' equity	4,105,575	4,174,300
Guarantors Subsidiaries
Current assets:
Cash and cash equivalents	419	1,149	1,537	2,237
Trade and other receivables, net	180,796	226,407
Inventories	1,193,528	1,041,719
Rotable assets	35,248	28,113
Deferred Tax Assets, Net, Current	145,352	57,291
Prepaid and other current assets	10,580	13,674
Total current assets	1,565,923	1,368,353
Property and equipment, net	806,442	801,560
Goodwill and other intangible assets, net	2,783,117	2,625,121
Other, net	34,955	7,860
Intercompany investments and advances	81,540	84,180
Total assets	5,271,977	4,887,074
Current liabilities:
Current portion of long-term debt	23,231	17,731
Accounts payable	380,457	296,968
Accrued expenses	326,455	212,984
Total current liabilities	730,143	527,683
Long-term debt, less current portion	71,046	58,714
Intercompany debt	1,769,564	2,021,330
Accrued pension and other postretirement benefits, noncurrent	527,741	501,716
Deferred income taxes and other	1,088,896	586,174
Total stockholders' equity	1,084,587	1,191,457
Total liabilities and stockholders' equity	5,271,977	4,887,074
Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	31,578	25,029	27,390	19,456
Trade and other receivables, net	337,472	289,306
Inventories	79,351	70,048
Rotable assets	13,572	13,553
Deferred Tax Assets, Net, Current	0	17
Prepaid and other current assets	6,011	4,246
Total current assets	467,984	402,199
Property and equipment, net	134,251	119,937
Goodwill and other intangible assets, net	219,866	144,941
Other, net	13,388	3,558
Intercompany investments and advances	63,897	12,333
Total assets	899,386	682,968
Current liabilities:
Current portion of long-term debt	0	0
Accounts payable	38,072	19,216
Accrued expenses	63,010	24,272
Total current liabilities	101,082	43,488
Long-term debt, less current portion	100,000	162,400
Intercompany debt	407,722	304,613
Accrued pension and other postretirement benefits, noncurrent	3,123	13
Deferred income taxes and other	61,363	24,114
Total stockholders' equity	226,096	148,340
Total liabilities and stockholders' equity	899,386	682,968
Eliminations
Current assets:
Cash and cash equivalents	0	0	0	0
Trade and other receivables, net	0	0
Inventories	0	0
Rotable assets	0	0
Deferred Tax Assets, Net, Current	0	0
Prepaid and other current assets	0	0
Total current assets	0	0
Property and equipment, net	0	0
Goodwill and other intangible assets, net	0	0
Other, net	0	0
Intercompany investments and advances	-4,207,495	-4,190,956
Total assets	-4,207,495	-4,190,956
Current liabilities:
Current portion of long-term debt	0	0
Accounts payable	0	0
Accrued expenses	0	0
Total current liabilities	0	0
Long-term debt, less current portion	0	0
Intercompany debt	-2,896,811	-2,851,159
Accrued pension and other postretirement benefits, noncurrent	0	0
Deferred income taxes and other	0	0
Total stockholders' equity	-1,310,684	-1,339,797
Total liabilities and stockholders' equity	($4,207,495)	($4,190,956)

SELECTED_CONSOLIDATING_FINANCI3

SELECTED CONSOLIDATING FINANCIAL STATEMENTS OF PARENT, GUARANTORS AND NON-GUARANTORS (Details 2) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Consolidating Financial Statements, Captions
Net sales	$1,080,277	$917,417	$994,123	$896,905	$936,410	$915,816	$967,345	$943,683	$3,888,722	$3,763,254	$3,702,702
Operating income	140,717	-61,266	114,698	240,524	80,908	84,779	92,971	141,346	434,673	400,004	531,213
Intercompany interest and charges									0	0	0
Interest expense and other									85,379	87,771	68,156
Income from continuing operations before income taxes									349,294	312,233	463,057
Income tax expense (benefit)									110,597	105,977	165,710
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest									238,697
Net income									238,697	206,256	297,347
Other Comprehensive Income (Loss), Net of Tax									-180,002	42,064	-51,666
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax									-46,949	-3,315	-1,832
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									58,695	248,320	245,681
Operating costs and expenses:
Cost of sales									3,141,453	2,911,802	2,763,488
Selling, general and administrative									285,773	254,715	241,349
Depreciation and amortization									158,323	164,277	129,506
Business Combination, Integration Related Costs									0	0	2,665
Restructuring Charges									3,193	31,290	0
Proceeds from Legal Settlements										0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments									0	1,166	34,481
Total operating costs and expenses									3,454,049	3,363,250	3,171,489
Parent
Consolidating Financial Statements, Captions
Net sales									0	0	0
Operating income									81,862	-40,618	-46,029
Intercompany interest and charges									-205,075	-215,079	-191,025
Interest expense and other									85,555	86,094	61,962
Income from continuing operations before income taxes									201,382	88,367	83,034
Income tax expense (benefit)									58,049	20,478	24,782
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest									143,333
Net income									143,333	67,889	58,252
Other Comprehensive Income (Loss), Net of Tax									-4,253	1,481	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									139,080	69,370	58,252
Operating costs and expenses:
Cost of sales									0	0	0
Selling, general and administrative									50,562	36,670	8,530
Depreciation and amortization									2,269	2,782	2,430
Business Combination, Integration Related Costs											588
Restructuring Charges									0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments										-1,166	34,481
Total operating costs and expenses									-81,862	40,618	46,029
Guarantors Subsidiaries
Consolidating Financial Statements, Captions
Net sales									3,592,062	3,569,094	3,608,064
Operating income									347,331	432,162	566,537
Intercompany interest and charges									196,394	207,397	187,713
Interest expense and other									10,438	6,103	9,463
Income from continuing operations before income taxes									140,499	218,662	369,361
Income tax expense (benefit)									54,359	85,061	139,799
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest									86,140
Net income									86,140	133,601	229,562
Other Comprehensive Income (Loss), Net of Tax									-128,800	43,898	-49,834
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									-42,660	177,499	179,728
Operating costs and expenses:
Cost of sales									2,900,408	2,760,627	2,703,416
Selling, general and administrative									199,569	192,422	213,408
Depreciation and amortization									141,561	152,593	122,626
Business Combination, Integration Related Costs											2,077
Restructuring Charges									3,193	31,290
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments										0	0
Total operating costs and expenses									3,244,731	3,136,932	3,041,527
Non-Guarantor Subsidiaries
Consolidating Financial Statements, Captions
Net sales									320,907	197,987	99,593
Operating income									5,480	8,460	10,705
Intercompany interest and charges									8,681	7,682	3,312
Interest expense and other									-10,614	-4,426	-3,269
Income from continuing operations before income taxes									7,413	5,204	10,662
Income tax expense (benefit)									-1,811	438	1,129
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest									9,224
Net income									9,224	4,766	9,533
Other Comprehensive Income (Loss), Net of Tax										-3,315	-1,832
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax									-46,949
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									-37,725	1,451	7,701
Operating costs and expenses:
Cost of sales									265,292	155,002	65,027
Selling, general and administrative									35,642	25,623	19,411
Depreciation and amortization									14,493	8,902	4,450
Business Combination, Integration Related Costs											0
Restructuring Charges									0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments										0	0
Total operating costs and expenses									315,427	189,527	88,888
Eliminations
Consolidating Financial Statements, Captions
Net sales									-24,247	-3,827	-4,955
Operating income									0	0	0
Intercompany interest and charges									0	0	0
Interest expense and other									0	0	0
Income from continuing operations before income taxes									0	0	0
Income tax expense (benefit)									0	0	0
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest									0
Net income									0	0	0
Other Comprehensive Income (Loss), Net of Tax									0	0	0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest									0	0	0
Operating costs and expenses:
Cost of sales									-24,247	-3,827	-4,955
Selling, general and administrative									0	0	0
Depreciation and amortization									0	0	0
Business Combination, Integration Related Costs											0
Restructuring Charges									0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments										0	0
Total operating costs and expenses									-24,247	-3,827	-4,955
Eaton Case - Net Settlement [Member]
Operating costs and expenses:
Proceeds from Legal Settlements									-134,693
Eaton Case - Net Settlement [Member] | Parent
Operating costs and expenses:
Proceeds from Legal Settlements									134,693
Eaton Case - Net Settlement [Member] | Guarantors Subsidiaries
Operating costs and expenses:
Proceeds from Legal Settlements									0
Eaton Case - Net Settlement [Member] | Non-Guarantor Subsidiaries
Operating costs and expenses:
Proceeds from Legal Settlements									0
Eaton Case - Net Settlement [Member] | Eliminations
Operating costs and expenses:
Proceeds from Legal Settlements									$0

SELECTED_CONSOLIDATING_FINANCI4

SELECTED CONSOLIDATING FINANCIAL STATEMENTS OF PARENT, GUARANTORS AND NON-GUARANTORS (Details 3) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Consolidating Financial Statements, Captions
Net income (loss)	$238,697	$206,256	$297,347
Adjustments to reconcile net income to net cash (used in) provided by operating activities	228,635	-71,119	23,571
Net cash provided by operating activities	467,332	135,137	320,918
Capital expenditures	-110,004	-206,414	-126,890
Reimbursement Revenue	653	9,086	5,156
Proceeds from sale of assets	3,167	45,047	3,993
Acquisitions, net of cash acquired	38,281	-94,456	-349,632
Net cash used in investing activities	-67,903	-246,737	-467,373
Net increase (decrease) in revolving credit facility	-46,150	98,557	-224,151
Proceeds on issuance of debt	508,960	451,003	528,135
Retirements and repayments of debt	-655,860	-416,645	-142,338
Payments for Repurchase of Common Stock	184,380	-19,134	0
Stock Repurchased During Period, Value	-184,380
Payment of deferred financing costs	-6,487	-3,297	-8,838
Dividends paid	-8,100	-8,344	-8,005
Receipt (Repayment) of Government Grants	-3,198	3,456	-1,090
Repurchase of restricted shares for minimum tax obligation	-673	-2,726	-1,840
Proceeds from exercise of stock options, including excess tax benefit	720	329	6,766
Intercompany financing and advances	0	0	0
Net cash (used in) provided by financing activities	-395,168	103,199	148,639
Effect of exchange rate changes on cash and cash equivalents	-642	5,362	191
Net change in cash and cash equivalents	3,619	-3,039	2,375
Cash at beginning of period	28,998	32,037	29,662
Cash at end of period	32,617	28,998	32,037
Parent
Consolidating Financial Statements, Captions
Net income (loss)	143,333	67,889	58,252
Adjustments to reconcile net income to net cash (used in) provided by operating activities	-154,295	108,816	42,111
Net cash provided by operating activities	-10,962	176,705	100,363
Capital expenditures	-905	-2,381	-1,315
Reimbursement Revenue	0	0	0
Proceeds from sale of assets	0	0	0
Acquisitions, net of cash acquired	0	0	0
Net cash used in investing activities	-905	-2,381	-1,315
Net increase (decrease) in revolving credit facility	-46,150	98,557	-224,151
Proceeds on issuance of debt	300,000	375,000	375,000
Retirements and repayments of debt	-401,232	-271,812	-19,594
Payments for Repurchase of Common Stock		-19,134
Stock Repurchased During Period, Value	-184,380
Payment of deferred financing costs	-6,487	-3,297	-8,838
Dividends paid	-8,100	-8,344	-8,005
Receipt (Repayment) of Government Grants	0	0	0
Repurchase of restricted shares for minimum tax obligation	-673	-2,726	-1,840
Proceeds from exercise of stock options, including excess tax benefit	720	329	6,766
Intercompany financing and advances	355,969	-343,187	-223,245
Net cash (used in) provided by financing activities	9,667	-174,614	-103,907
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net change in cash and cash equivalents	-2,200	-290	-4,859
Cash at beginning of period	2,820	3,110	7,969
Cash at end of period	620	2,820	3,110
Guarantors Subsidiaries
Consolidating Financial Statements, Captions
Net income (loss)	86,140	133,601	229,562
Adjustments to reconcile net income to net cash (used in) provided by operating activities	397,607	-170,631	4,046
Net cash provided by operating activities	483,747	-37,030	233,608
Capital expenditures	-92,686	-185,794	-119,949
Reimbursement Revenue	653	9,086	5,156
Proceeds from sale of assets	3,092	45,038	3,985
Acquisitions, net of cash acquired	112,110	-6,505	-349,632
Net cash used in investing activities	23,169	-138,175	-460,440
Net increase (decrease) in revolving credit facility	0	0	0
Proceeds on issuance of debt	37,660	30,503	14,435
Retirements and repayments of debt	-20,928	-27,218	-14,044
Payments for Repurchase of Common Stock		0
Stock Repurchased During Period, Value	0
Payment of deferred financing costs	0	0	0
Dividends paid	0	0	0
Receipt (Repayment) of Government Grants	-3,198	3,456	-1,090
Repurchase of restricted shares for minimum tax obligation	0	0	0
Proceeds from exercise of stock options, including excess tax benefit	0	0	0
Intercompany financing and advances	-521,180	168,076	226,831
Net cash (used in) provided by financing activities	-507,646	174,817	226,132
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net change in cash and cash equivalents	-730	-388	-700
Cash at beginning of period	1,149	1,537	2,237
Cash at end of period	419	1,149	1,537
Non-Guarantor Subsidiaries
Consolidating Financial Statements, Captions
Net income (loss)	9,224	4,766	9,533
Adjustments to reconcile net income to net cash (used in) provided by operating activities	-25,590	-3,502	-22,586
Net cash provided by operating activities	-16,366	1,264	-13,053
Capital expenditures	-16,413	-18,239	-5,626
Reimbursement Revenue	0	0	0
Proceeds from sale of assets	75	9	8
Acquisitions, net of cash acquired	-73,829	-87,951	0
Net cash used in investing activities	-90,167	-106,181	-5,618
Net increase (decrease) in revolving credit facility	0	0	0
Proceeds on issuance of debt	171,300	45,500	138,700
Retirements and repayments of debt	-233,700	-117,615	-108,700
Payments for Repurchase of Common Stock		0
Stock Repurchased During Period, Value	0
Payment of deferred financing costs	0	0	0
Dividends paid	0	0	0
Receipt (Repayment) of Government Grants	0	0	0
Repurchase of restricted shares for minimum tax obligation	0	0	0
Proceeds from exercise of stock options, including excess tax benefit	0	0	0
Intercompany financing and advances	176,124	169,309	-3,586
Net cash (used in) provided by financing activities	113,724	97,194	26,414
Effect of exchange rate changes on cash and cash equivalents	-642	5,362	191
Net change in cash and cash equivalents	6,549	-2,361	7,934
Cash at beginning of period	25,029	27,390	19,456
Cash at end of period	31,578	25,029	27,390
Eliminations
Consolidating Financial Statements, Captions
Net income (loss)	0	0	0
Adjustments to reconcile net income to net cash (used in) provided by operating activities	10,913	-5,802	0
Net cash provided by operating activities	10,913	-5,802	0
Capital expenditures	0	0	0
Reimbursement Revenue	0	0	0
Proceeds from sale of assets	0	0	0
Acquisitions, net of cash acquired	0	0	0
Net cash used in investing activities	0	0	0
Net increase (decrease) in revolving credit facility	0	0	0
Proceeds on issuance of debt	0	0	0
Retirements and repayments of debt	0	0	0
Payments for Repurchase of Common Stock		0
Stock Repurchased During Period, Value	0
Payment of deferred financing costs	0	0	0
Dividends paid	0	0	0
Receipt (Repayment) of Government Grants	0	0	0
Repurchase of restricted shares for minimum tax obligation	0	0	0
Proceeds from exercise of stock options, including excess tax benefit	0	0	0
Intercompany financing and advances	-10,913	5,802	0
Net cash (used in) provided by financing activities	-10,913	5,802	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net change in cash and cash equivalents	0	0	0
Cash at beginning of period	0	0	0
Cash at end of period	$0	$0	$0

QUARTERLY_FINANCIAL_INFORMATIO2

QUARTERLY FINANCIAL INFORMATION (Unaudited) QUARTERLY FINANCIAL INFORMATION (Unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Proceeds from Legal Settlements										$0	$0
Selected Quarterly Financial Information [Abstract]
Net sales	1,080,277	917,417	994,123	896,905	936,410	915,816	967,345	943,683	3,888,722	3,763,254	3,702,702
Gross Profit	237,071	24,068	197,566	188,112	182,243	166,518	171,143	222,303
Operating income (loss)	140,717	-61,266	114,698	240,524	80,908	84,779	92,971	141,346	434,673	400,004	531,213
Net Income									238,697	206,256	297,347
Net income (in dollars per share)	$1.66	($0.79)	$1.32	$2.48	$0.81	$0.68	$0.96	$1.56	$4.70	$3.99	$5.99
Net income (in dollars per share)	$1.66	($0.79)	$1.32	$2.46	$0.80	$0.67	$0.94	$1.50	$4.68	$3.91	$5.67
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments									0	1,166	34,481
Loss on Contracts									151,992
Aerostructures
Selected Quarterly Financial Information [Abstract]
Net sales	704,478	559,465	632,072	611,863	632,601	637,202	690,748	651,888	2,507,878	2,612,439	2,781,344
Operating income (loss)	86,861	-102,461	72,230	70,866	35,686	52,412	64,425	100,387	127,495	252,910	469,873
Aerospace Systems
Selected Quarterly Financial Information [Abstract]
Net sales	301,165	279,198	288,902	219,852	235,339	211,402	205,483	219,526	1,089,117	871,750	615,771
Operating income (loss)	58,612	41,863	46,214	37,352	42,834	32,504	31,740	42,643	184,042	149,721	103,179
Aftermarket Services
Selected Quarterly Financial Information [Abstract]
Net sales	81,372	80,690	74,343	67,608	70,463	69,556	72,971	74,353	304,013	287,343	314,507
Operating income (loss)	13,317	12,490	11,620	10,504	11,587	9,297	10,102	11,279	47,931	42,265	45,380
Elimination of inter-segment sales
Selected Quarterly Financial Information [Abstract]
Net sales	-6,738	-1,936	-1,194	-2,418	-1,993	-2,344	-1,857	-2,084	-12,286	-8,278	-8,920
Operating income (loss)	-18,073	-13,158	-15,366	121,802	-9,199	-9,434	-13,296	-12,963
Eaton Case - Net Settlement [Member]
Proceeds from Legal Settlements									($134,693)

SUBSEQUENT_EVENTS_SUBSEQUENT_E

SUBSEQUENT EVENTS SUBSEQUENT EVENTS (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Subsequent Event [Line Items]
Treasury Stock, Shares, Acquired	2,923,011	300,000
Stock Repurchased During Period, Value	($184,380)

Valuation_and_Qualifying_Accou2

Valuation and Qualifying Accounts Valuation and Qualifying Accounts (Details) (Allowance for Doubtful Accounts [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance (period start)	$6,535	$5,372	$3,900
Valuation Allowances and Reserves, Charged to Cost and Expense	171	2,191	1,974
Valuation Allowances and Reserves, Adjustments	85	6	70
Valuation Allowances and Reserves, Deductions	-316	-1,034	-572
Valuation Allowances and Reserves, Balance (period end)	$6,475	$6,535	$5,372