TransDigm (TDG) 10-K15 Nov 132013 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
Document and Entity Information (USD $)	Sep. 30, 2013	Oct. 26, 2013	Mar. 30, 2013
Document Information [Line Items]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	30-Sep-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'TDG	'	'
Entity Registrant Name	'TRANSDIGM GROUP INC	'	'
Entity Central Index Key	'0001260221	'	'
Current Fiscal Year End Date	'--09-30	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	52,669,105	'
Entity Public Float	'	'	$7,358,619,432

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
CURRENT ASSETS:	'	'
Cash and cash equivalents	$564,740	$440,524
Trade accounts receivable-Net	290,449	235,783
Inventories-Net	413,581	320,503
Deferred income taxes	30,182	29,134
Prepaid expenses and other	21,543	24,587
Total current assets	1,320,495	1,050,531
PROPERTY, PLANT AND EQUIPMENT-Net	208,964	172,737
GOODWILL	3,343,907	3,035,502
TRADEMARKS AND TRADE NAMES	485,690	467,614
OTHER INTANGIBLE ASSETS-Net	703,800	655,996
DEBT ISSUE COSTS-Net	72,668	62,190
OTHER	13,355	15,047
TOTAL ASSETS	6,148,879	5,459,617
CURRENT LIABILITIES:	'	'
Current portion of long-term debt	31,045	20,500
Accounts payable	106,768	74,178
Accrued liabilities	184,687	139,237
Total current liabilities	322,500	233,915
LONG-TERM DEBT	5,700,193	3,598,625
DEFERRED INCOME TAXES	384,301	356,896
OTHER NON-CURRENT LIABILITIES	78,266	51,347
Total liabilities	6,485,260	4,240,783
STOCKHOLDERS' (DEFICIT) EQUITY:	'	'
Common stock-$.01 par value; authorized 224,400,000 shares; issued 53,172,551 and 52,157,225 at September 30, 2013 and 2012, respectively	532	521
Additional paid-in capital	689,935	553,223
(Accumulated deficit) / retained earnings	-1,004,244	689,229
Accumulated other comprehensive loss	-6,516	-8,051
Treasury stock, at cost; 505,400 shares at September 30, 2013 and 2012	-16,088	-16,088
Total stockholders' (deficit) equity	-336,381	1,218,834
TOTAL LIABILITIES AND STOCKHOLDERS' (DEFICIT) EQUITY	$6,148,879	$5,459,617

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	224,400,000	224,400,000
Common stock, shares issued	53,172,551	52,157,225
Treasury stock, shares	505,400	505,400

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	1 Months Ended		12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 03, 2013	Oct. 15, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
NET SALES	'	'	$1,924,400	$1,700,208	$1,206,021
COST OF SALES	'	'	874,838	754,491	544,836
GROSS PROFIT	'	'	1,049,562	945,717	661,185
SELLING AND ADMINISTRATIVE EXPENSES	'	'	254,468	201,709	133,711
AMORTIZATION OF INTANGIBLE ASSETS	'	'	45,639	44,233	40,339
INCOME FROM OPERATIONS	'	'	749,455	699,775	487,135
INTEREST EXPENSE-Net	'	'	270,685	211,906	185,256
REFINANCING COSTS	'	'	30,281	'	72,454
Income from continuing operations before income taxes	'	'	448,489	487,869	229,425
INCOME TAX PROVISION	'	'	145,700	162,900	77,200
INCOME FROM CONTINUING OPERATIONS	'	'	302,789	324,969	152,225
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX	'	'	'	'	19,909
NET INCOME	'	'	302,789	324,969	172,134
NET INCOME APPLICABLE TO COMMON STOCK	'	'	$131,546	$321,670	$169,323
Net earnings per share-see Note 5:	'	'	'	'	'
Net earnings per share from continuing operations-basic and diluted	'	'	$2.39	$5.97	$2.80
Net earnings per share from discontinued operations-basic and diluted	'	'	'	'	$0.37
Net earnings per share	'	'	$2.39	$5.97	$3.17
Cash dividends paid per common share	$22	$12.85	$34.85	'	'
Weighted-average shares outstanding:	'	'	'	'	'
Basic and diluted	'	'	55,080	53,882	53,333

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Net income	$302,789	$324,969	$172,134
Other comprehensive income (loss), net of tax:	'	'	'
Foreign currency translation adjustments	4,117	-1,315	1,498
Interest rate swap agreements, net of tax	-3,587	-2,635	-1,077
Pension liability adjustments, net of tax	1,005	-824	102
Other comprehensive income (loss), net of tax	1,535	-4,774	523
TOTAL COMPREHENSIVE INCOME	$304,324	$320,195	$172,657

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' (Deficit) Equity (USD $)	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Treasury Stock
In Thousands, except Share data	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Treasury Stock
BEGINNING BALANCE at Oct. 02, 2010	$592,979	$499	$419,396	$192,126	($3,800)	($15,242)
BEGINNING BALANCE (in shares) at Oct. 02, 2010	'	49,928,241	'	'	'	-494,100
Compensation expense recognized for employee stock options	12,568	'	12,568	'	'	'
Excess tax benefits related to share-based payment arrangements	23,411	'	23,411	'	'	'
Exercise of employee stock options (in shares)	'	899,395	'	'	'	'
Exercise of employee stock options	9,208	9	9,199	'	'	'
Restricted stock compensation	6	'	6	'	'	'
Common stock issued (in shares)	'	1,640	'	'	'	'
Common stock issued	120	'	120	'	'	'
Net income	172,134	'	'	172,134	'	'
Interest rate swap, net of tax	-1,077	'	'	'	-1,077	'
Foreign currency translation adjustments	1,498	'	'	'	1,498	'
Pension liability adjustments, net of tax	102	'	'	'	102	'
ENDING BALANCE at Sep. 30, 2011	810,949	508	464,700	364,260	-3,277	-15,242
ENDING BALANCE (in shares) at Sep. 30, 2011	'	50,829,276	'	'	'	-494,100
Compensation expense recognized for employee stock options	22,151	'	22,151	'	'	'
Excess tax benefits related to share-based payment arrangements	50,555	'	50,555	'	'	'
Exercise of employee stock options (in shares)	'	1,327,029	'	'	'	'
Exercise of employee stock options	15,710	13	15,697	'	'	'
Treasury stock purchased, shares	-11,300	'	'	'	'	-11,300
Treasury stock purchased	-846	'	'	'	'	-846
Common stock issued (in shares)	'	920	'	'	'	'
Common stock issued	120	'	120	'	'	'
Net income	324,969	'	'	324,969	'	'
Interest rate swap, net of tax	-2,635	'	'	'	-2,635	'
Foreign currency translation adjustments	-1,315	'	'	'	-1,315	'
Pension liability adjustments, net of tax	-824	'	'	'	-824	'
ENDING BALANCE at Sep. 30, 2012	1,218,834	521	553,223	689,229	-8,051	-16,088
ENDING BALANCE (in shares) at Sep. 30, 2012	'	52,157,225	'	'	'	-505,400
Dividends paid	-1,950,683	'	'	-1,950,683	'	'
Unvested dividend equivalents	-45,579	'	'	-45,579	'	'
Compensation expense recognized for employee stock options	48,884	'	48,884	'	'	'
Excess tax benefits related to share-based payment arrangements	66,201	'	66,201	'	'	'
Exercise of employee stock options (in shares)	'	1,014,613	'	'	'	'
Exercise of employee stock options	21,534	11	21,523	'	'	'
Treasury stock purchased, shares	0	'	'	'	'	'
Common stock issued (in shares)	'	713	'	'	'	'
Common stock issued	104	'	104	'	'	'
Net income	302,789	'	'	302,789	'	'
Interest rate swap, net of tax	-3,587	'	'	'	-3,587	'
Foreign currency translation adjustments	4,117	'	'	'	4,117	'
Pension liability adjustments, net of tax	1,005	'	'	'	1,005	'
ENDING BALANCE at Sep. 30, 2013	($336,381)	$532	$689,935	($1,004,244)	($6,516)	($16,088)
ENDING BALANCE (in shares) at Sep. 30, 2013	'	53,172,551	'	'	'	-505,400

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
OPERATING ACTIVITIES:	'	'	'
Net income	$302,789	$324,969	$172,134
Net income from discontinued operations	'	'	-19,909
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'
Depreciation	27,307	23,692	20,092
Amortization of intangible assets	46,208	44,535	40,368
Amortization of debt issue costs	11,933	12,544	9,842
REFINANCING COSTS	30,281	'	72,454
Non-cash equity compensation	48,884	22,151	12,574
Excess tax benefits related to share-based payment arrangements	-66,201	-50,555	-23,411
Deferred income taxes	-2,614	24,800	8,888
Changes in assets/liabilities, net of effects from acquisitions of businesses:	'	'	'
Trade accounts receivable	-25,006	-1,957	-14,993
Inventories	-15,289	-416	-9,661
Income taxes receivable/payable	65,510	34,097	-22,259
Other assets	1,155	-10,564	-2,692
Accounts payable	23,510	-3,620	4,484
Accrued and other liabilities	21,738	-5,791	12,475
Net cash provided by operating activities	470,205	413,885	260,386
INVESTING ACTIVITIES:	'	'	'
Capital expenditures	-35,535	-25,246	-18,026
Acquisition of businesses, net of cash acquired	-483,257	-868,696	-1,650,363
Cash proceeds from sale of investment	16,350	'	'
Cash proceeds from sale of business	'	17,650	'
Cash proceeds from sales of discontinued operations	'	'	271,361
Net cash used in investing activities	-502,442	-876,292	-1,397,028
FINANCING ACTIVITIES:	'	'	'
Excess tax benefits related to share-based payment arrangements	66,201	50,555	23,411
Proceeds from exercise of stock options	21,534	15,710	9,208
Dividends paid	-1,991,350	-3,299	-2,811
Treasury stock purchased	'	-846	'
Proceeds from 2013 credit facility-net	3,064,014	'	'
Repayment on 2013 credit facility	-18,760	'	'
Proceeds from 2011 credit facility-net	147,360	484,316	1,500,048
Repayment on credit facility	-2,169,125	-19,250	-11,625
Proceeds from senior subordinated notes	'	'	1,582,184
Repurchase of senior subordinated notes due 2014	'	'	-1,041,894
Net cash provided by financing activities	156,195	527,186	1,278,521
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	258	-438	192
NET INCREASE IN CASH AND CASH EQUIVALENTS	124,216	64,341	142,071
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	440,524	376,183	234,112
CASH AND CASH EQUIVALENTS, END OF PERIOD	564,740	440,524	376,183
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:	'	'	'
Cash paid during the period for interest	236,769	197,787	155,849
Cash paid during the period for income taxes	82,292	103,938	88,367
2011 Credit Facility	'	'	'
FINANCING ACTIVITIES:	'	'	'
Repayment on credit facility	-2,169,125	-19,250	-11,625
7 1/2% Senior Subordinated Notes, Due 2021	'	'	'
FINANCING ACTIVITIES:	'	'	'
Proceeds from senior subordinated notes	494,765	'	'
5 1/2% Senior Subordinated Notes, Due 2020	'	'	'
FINANCING ACTIVITIES:	'	'	'
Proceeds from senior subordinated notes	541,556	'	'
7 3/4% Senior Subordinated Notes, Due 2018	'	'	'
FINANCING ACTIVITIES:	'	'	'
Proceeds from senior subordinated notes	'	'	1,582,184
Credit Facility Twenty Zero Six	'	'	'
FINANCING ACTIVITIES:	'	'	'
Repayment on credit facility	'	'	($780,000)

Description_of_the_Business

Description of the Business	12 Months Ended
	Sep. 30, 2013
Description of the Business	'
	1	DESCRIPTION OF THE BUSINESS
	Description of the Business—TransDigm Group Incorporated (“TD Group”), through its wholly-owned subsidiary, TransDigm Inc., is a leading global designer, producer and supplier of highly engineered aircraft components for use on nearly all commercial and military aircraft in service today. TransDigm Inc. along with TransDigm Inc.’s direct and indirect wholly-owned operating subsidiaries (collectively, with TD Group, the “Company” or “TransDigm”), offers a broad range of proprietary aerospace components. TD Group has no significant assets or operations other than its 100% ownership of TransDigm Inc. TD Group’s common stock is listed on The New York Stock Exchange, or the NYSE, under the trading symbol “TDG.”
	Major product offerings, substantially all of which are ultimately provided to end-users in the aerospace industry, include mechanical/electro-mechanical actuators and controls, ignition systems and engine technology, specialized pumps and valves, power conditioning devices, specialized AC/DC electric motors and generators, NiCad batteries and chargers, engineered latching and locking devices, rods and locking devices, engineered connectors and elastomers, cockpit security components and systems, specialized cockpit displays, aircraft audio systems, specialized lavatory components, seatbelts and safety restraints, engineered interior surfaces and lighting and control technology.
	Separate Financial Statements—Separate financial statements of TransDigm Inc. are not presented because TransDigm Inc.’s 7³/₄% Senior Subordinated Notes due 2018, 5¹/₂% Senior Subordinated Notes due 2020 and 7¹/₂% Senior Subordinated Notes due 2021 are fully and unconditionally guaranteed on a senior subordinated basis by TD Group and all existing 100% owned domestic subsidiaries of TransDigm Inc. and because TD Group has no significant operations or assets separate from its investment in TransDigm Inc.

Acquisitions

Acquisitions	12 Months Ended
Acquisitions	Sep. 30, 2013
Acquisitions	'
	2	ACQUISITIONS
	Whippany Actuation Systems, LLC—On June 28, 2013, Whippany Actuation Systems, LLC, a newly formed subsidiary of TransDigm Inc., acquired assets from GE Aviation’s Electromechanical Actuation Division (“Whippany Actuation”) for approximately $149.5 million in cash, subject to adjustments based on the level of working capital as of the closing date of the acquisition. Whippany Actuation manufactures proprietary, highly engineered aerospace electromechanical motion control subsystems for civil and military applications, with product offerings including control electronics, motors, high power mechanical transmissions and actuators. These products fit well with TransDigm’s overall business direction. Whippany is included in TransDigm’s Power & Control segment. The Company expects that the approximately $101 million of goodwill recognized for the acquisition will be deductible for tax purposes.
	Arkwin Industries, Inc.—On June 5, 2013, TransDigm Inc. acquired all of the outstanding stock of Arkwin Industries, Inc. (“Arkwin”), for approximately $285.7 million in cash, which includes a purchase price adjustment of $0.2 million received in the fourth quarter of fiscal 2013. Arkwin manufactures proprietary, highly engineered aerospace hydraulic and fuel system components for commercial and military aircraft, helicopters and other specialty applications. These products fit well with TransDigm’s overall business direction. Arkwin is included in TransDigm’s Power & Control segment. The Company expects that the approximately $184 million of goodwill recognized for the acquisition will not be deductible for tax purposes.
	Aerosonic, LLC—On June 5, 2013, Buccaneer Acquisition Sub Inc., a newly formed subsidiary of TransDigm Inc., completed the tender offer of a majority of the outstanding stock of Aerosonic Corporation (“Aerosonic”). Buccaneer Acquisition Sub Inc. was subsequently merged into Aerosonic on June 10, 2013; in connection therewith, all outstanding shares of Aerosonic were cancelled and Aerosonic became a wholly owned subsidiary of TransDigm Inc. The aggregate price paid in the tender offer and merger was approximately $39.8 million in cash. Aerosonic designs and manufactures proprietary, highly engineered mechanical and digital altimeters, airspeed indicators, rate of climb indicators, microprocessor controlled air data test sets, angle of attack stall warning systems, integrated air data sensors and other aircraft sensors, monitoring systems and flight instrumentation for use on commercial and military aircraft. These products fit well with TransDigm’s overall business direction. Aerosonic is included in TransDigm’s Airframe segment. The Company expects that the approximately $14 million of goodwill recognized for the acquisition will not be deductible for tax purposes.
	Aero-Instruments Co., LLC—On September 17, 2012, TransDigm Inc. acquired all of the outstanding equity interests in Aero-Instruments Co., LLC (“Aero-Instruments”), for approximately $34.6 million in cash, which includes a purchase price adjustment of $0.1 million received in the first quarter of fiscal 2013. Aero-Instruments designs and manufactures highly engineered air data sensors including pitot probes, pitot-static probes, static pressure ports, angle of attack, temperature sensors and flight test equipment for use primarily in the business jet and helicopter markets. These products fit well with TransDigm’s overall business direction. Aero-Instruments has since been merged into AeroControlex Group and is included in TransDigm’s Power & Control segment. The Company expects that the approximately $22 million of goodwill recognized for the acquisition will be deductible for tax purposes.
	AmSafe Global Holdings, Inc.—On February 15, 2012, TransDigm Inc. acquired all of the outstanding stock of AmSafe Global Holdings, Inc. (“AmSafe”), for approximately $749.7 million in cash, which includes a purchase price adjustment of $0.5 million paid in the third quarter of fiscal 2012. AmSafe is a leading supplier of innovative, highly engineered and proprietary safety and restraint equipment used primarily in the global aerospace industry. These products fit well with TransDigm’s overall business direction. The majority of AmSafe product lines are included in TransDigm’s Airframe segment, and the remaining product lines are included in the Non-aviation segment. The distribution business acquired as part of AmSafe was sold on August 16, 2012 for approximately $17.8 million in cash, which includes a working capital adjustment of $0.1 million received in the first quarter of fiscal 2013. The equity investment in C-Safe LLC acquired as part of AmSafe was sold in October 2012 for approximately $16.4 million, which consisted of $5.0 million in cash at closing and an $11.4 million short-term note receivable, which was subsequently received in installments during fiscal 2013.
	The total purchase price was allocated to the underlying assets acquired and liabilities assumed based upon management’s estimated fair values at the date of acquisition. To the extent the purchase price exceeded the estimated fair value of the net identifiable tangible and intangible assets acquired, such excess was allocated to goodwill.
	The following table summarizes the purchase price allocation of the estimated fair values of the assets acquired and liabilities assumed at the transaction date (in thousands).


	Assets acquired:
	Current assets, excluding cash acquired		$	122,694
	Property, plant and equipment			20,787
	Intangible assets			270,500
	Goodwill			396,823
	Other			15,614

	Total assets acquired		$	826,418

	Liabilities assumed:
	Current liabilities		$	24,979
	Deferred income taxes—long term			48,626
	Other noncurrent liabilities			3,082

	Total liabilities assumed		$	76,687

	Net assets acquired		$	749,731


	The Company expects that of the $397 million of goodwill recognized for the acquisition approximately $77 million will be deductible for tax purposes.
	Harco Laboratories, Incorporated—On December 9, 2011, TransDigm Inc. acquired all of the outstanding stock of Harco Laboratories, Incorporated (“Harco”), for approximately $83.3 million in cash, which includes a purchase price adjustment of $0.4 million paid in the second quarter of fiscal 2012. Harco designs and manufactures highly engineered thermocouples, sensors, engine cable assemblies and related products for commercial aircraft. These products fit well with TransDigm’s overall business direction. Harco is included in TransDigm’s Power & Control segment. The Company expects that the approximately $56 million of goodwill recognized for the acquisition will not be deductible for tax purposes.
	Schneller Holdings LLC—On August 31, 2011, TransDigm Inc. acquired all of the outstanding equity interests in Schneller Holdings LLC (“Schneller”) for approximately $288.6 million in cash, which includes a purchase price adjustment of $1.0 million paid in the first quarter of fiscal 2012. Schneller designs and manufactures proprietary, highly engineered laminates, thermoplastics, and non-textile flooring for use primarily on side walls, lavatories, galleys, bulkheads and cabin floors for commercial aircraft. These products fit well with TransDigm’s overall business direction. Schneller is included in TransDigm’s Airframe segment. The Company expects that the approximately $168 million of goodwill recognized for the acquisition will be deductible for tax purposes.
	Talley Actuation—On December 31, 2010, AeroControlex Group, Inc., a wholly owned subsidiary of TransDigm Inc., acquired the actuation business of Telair International Inc. (“Talley Actuation”), a wholly-owned subsidiary of Teleflex Incorporated, for approximately $93.6 million in cash, which includes a purchase price adjustment of $0.3 million received in the third quarter of fiscal 2011. Talley Actuation manufactures proprietary, highly engineered electro-mechanical products and other components for commercial and military aircraft. These products fit well with TransDigm’s overall business direction. Talley Actuation is included in TransDigm’s Power & Control segment. The Company expects that the approximately $70 million of goodwill recognized for the acquisition will be deductible for tax purposes.
	McKechnie Aerospace Holdings, Inc.—On December 6, 2010, TransDigm Inc. acquired all of the outstanding stock of McKechnie Aerospace Holdings Inc. (“McKechnie Aerospace”), for approximately $1.27 billion in cash, which includes a purchase price adjustment of $0.3 million paid in the third quarter of fiscal 2011. McKechnie Aerospace, through its subsidiaries, is a leading global designer, producer and supplier of aerospace components, assemblies and subsystems for commercial aircraft, regional/business jets, military fixed wing and rotorcraft. Some of the businesses acquired as part of McKechnie Aerospace have been divested. The remaining products fit well with TransDigm’s overall business direction. Product lines of McKechnie Aerospace are included in both TransDigm’s Power & Control and Airframe segments. The Company expects that the approximately $865 million of goodwill recognized for the acquisition will not be deductible for tax purposes.
	The Company accounted for the acquisitions using the acquisition method and included the results of operations of the acquisitions in its consolidated financial statements from the effective date of each acquisition. The Company is in the process of obtaining a third-party valuation of certain tangible and intangible assets of Whippany Actuation, Arkwin and Aerosonic; therefore, the values attributed to those acquired assets in the consolidated financial statements are subject to adjustment. Pro forma net sales and results of operations for the acquisitions, had they occurred at the beginning of the applicable fiscal year ended September 30, 2013 or 2012, are not significant and, accordingly, are not provided.
	The acquisitions strengthen and expand the Company’s position to design, produce and supply highly-engineered proprietary aerospace components in niche markets with significant aftermarket content and provide opportunities to create value through the application of our three core value-driven operating strategies (obtaining profitable new business, improving our cost structure, and providing highly engineered value-added products to customers). The purchase price paid for each acquisition reflects the current earnings before interest, taxes, depreciation and amortization (EBITDA) and cash flows, as well as, the future EBITDA and cash flows expected to be generated by the business, which are driven in most cases by the recurring aftermarket consumption over the life of a particular aircraft, estimated to be approximately 30 years.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Sep. 30, 2013
Summary of Significant Accounting Policies	'
	3	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Basis of Presentation and Consolidation—The accompanying consolidated financial statements were prepared in conformity with generally accepted accounting principles in the United States (“GAAP”) and include the accounts of TD Group and subsidiaries. All significant intercompany balances and transactions have been eliminated.
	Revenue Recognition and Related Allowances—Revenue is recognized from the sale of products when title and risk of loss passes to the customer, which is generally at the time of shipment. Substantially all product sales are made pursuant to firm, fixed-price purchase orders received from customers. Provisions for estimated returns, uncollectible accounts and the cost of repairs under contract warranty provisions are provided for in the same period as the related revenues are recorded and are principally based on historical results modified, as appropriate, by the most current information available. Due to uncertainties in the estimation process, it is possible that actual results may vary from the estimates.
	Shipping and Handling Costs—Shipping and handling costs are included in cost of sales in the Consolidated Statements of Income.
	Research and Development Costs—The Company expenses research and development costs as incurred and classifies such amounts in selling and administrative expenses. The expense recognized for research and development costs for the years ended September 30, 2013, 2012 and 2011 was approximately $32.1 million, $27.9 million, and $19.3 million, respectively.
	Cash Equivalents—The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents.
	Allowance for Uncollectible Accounts—The Company reserves for amounts determined to be uncollectible based on specific identification of losses and estimated losses based on historical experience. The allowance also incorporates a provision for the estimated impact of disputes with customers. The determination of the amount of the allowance for doubtful accounts is subject to significant levels of judgment and estimation by management. If circumstances change or economic conditions deteriorate or improve, the allowance for doubtful accounts could increase or decrease.
	Inventories—Inventories are stated at the lower of cost or market. Cost of inventories is determined by the average cost and the first-in, first-out (FIFO) methods for all locations except CEF Industries, LLC which determines the cost of inventories using the last-in, first-out (LIFO) method. Approximately 4% of the inventory was valued under the LIFO method at September 30, 2013. Provision for potentially obsolete or slow-moving inventory is made based on management’s analysis of inventory levels and future sales forecasts. In accordance with industry practice, all inventories are classified as current assets even though a portion of the inventories may not be sold within one year.
	Property, Plant and Equipment—Property, plant and equipment are stated at cost. Depreciation is computed using the straight-line method over the following estimated useful lives: land improvements from 10 to 20 years, buildings and improvements from 5 to 30 years, machinery and equipment from 2 to 10 years and furniture and fixtures from 3 to 10 years.
	Property, plant and equipment is assessed for potential impairment whenever indicators of impairment are present by determining whether the carrying value of the property can be recovered through projected, undiscounted cash flows from future operations over the property’s remaining estimated useful life. Any impairment recognized is the amount by which the carrying amount exceeds the fair value of the asset.
	Debt Issue Costs, Premiums and Discounts—The cost of obtaining financing as well as premiums and discounts are amortized using the effective interest method over the terms of the respective obligations/securities.
	Intangible Assets—Intangible assets consist of identifiable intangibles acquired or recognized in accounting for the acquisitions (trademarks, trade names, technology, order backlog and other intangible assets) and goodwill. Goodwill and intangible assets that have indefinite useful lives (trademarks and trade names) are subject to annual impairment testing. Management determines fair value using a discounted future cash flow analysis or other accepted valuation techniques. The Company performs an annual impairment test for goodwill and other intangible assets as of the first day of the fourth fiscal quarter of each year, or more frequently, if an event occurs or circumstances change that would more likely than not reduce fair value below current value.
	A two-step impairment test is used to identify potential goodwill impairment. The first step of the goodwill impairment test, used to identify potential impairment, compares the fair value of a reporting unit (as defined) with its carrying amount, including goodwill. If the fair value of the reporting unit exceeds its carrying amount, goodwill is not considered impaired, and the second step of the goodwill impairment test is unnecessary. The second step measures the amount of impairment, if any, by comparing the carrying value of the goodwill associated with a reporting unit to the implied fair value of the goodwill derived from the estimated overall fair value of the reporting unit and the individual fair values of the other assets and liabilities of the reporting unit.
	GAAP requires that the annual, and any interim, impairment assessment be performed at the reporting unit level. The reporting unit level is one level below an operating segment. Substantially all goodwill was determined and recognized for each reporting unit pursuant to the accounting for the merger or acquisition as of the date of each transaction. With respect to acquisitions integrated into an existing reporting unit, any acquired goodwill is combined with the goodwill of the reporting unit.
	The impairment test for indefinite lived intangible assets consists of a comparison between their fair values and carrying values. If the carrying amounts of intangible assets that have indefinite useful lives exceed their fair values, an impairment loss will be recognized in an amount equal to the sum of any such excesses.
	The Company assesses the recoverability of its amortizable intangible assets only when indicators of impairment are present by determining whether the amortization over their remaining lives can be recovered through projected, undiscounted cash flows from future operations. Amortization of amortizable intangible assets is computed using the straight-line method over the following estimated useful lives: technology from 20 to 22 years, order backlog over one year, and other intangible assets over 20 years.
	Stock Option Plans—The Company records stock-based compensation measured using the fair value method of accounting. Compensation expense is recorded over the vesting periods of the options. For options subject to accelerated vesting under the “market sweep” provision, additional stock compensation expense is recorded representing costs that would have been recognized over the remaining requisite service period of the award when the market condition is met.
	Income Taxes—The Company accounts for income taxes using an asset and liability approach. Deferred taxes are recorded for the difference between the book and tax basis of various assets and liabilities. A valuation allowance is provided when it is more likely than not that some or all of a deferred tax asset will not be realized.
	Contingencies—During the ordinary course of business, the Company is from time to time threatened with, or may become a party to, legal actions and other proceedings. While the Company is currently involved in certain legal proceedings, it believes the results of these proceedings will not have a material adverse effect on its financial condition, results of operations, or cash flows.

	Discontinued Operations—During the year ended September 30, 2011, the Company sold, for aggregate cash proceeds of $271.4 million, two businesses which had been acquired as part of the McKechnie Aerospace acquisition and accounted for the sales as discontinued operations. Aggregate net sales of $24.1 million and losses from discontinued operations of $2.1 million were recognized during the period from the date of the McKechnie Aerospace acquisition through the respective dates of sale of the businesses. The consolidated statement of income for the year ended September 30, 2011 includes income from discontinued operations, net of tax, of $19.9 million, comprising the aggregate net after-tax gain of $22.0 million and the losses from discontinued operations of $2.1 million.
	Estimates—The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	Comprehensive Income (Loss)—The term “comprehensive income (loss)” represents the change in stockholders’ equity from transactions and other events and circumstances resulting from non-stockholder sources. The Company’s accumulated other comprehensive income or loss, consisting principally of fair value adjustments to its interest rate swap agreements (net of tax), cumulative foreign currency translation adjustments and pension liability adjustments (net of tax), is reported separately in the accompanying consolidated statements of comprehensive income.
	Earnings per Share—Earnings per share information is determined using the two-class method, which includes the weighted-average number of common shares outstanding during the period and other securities that participate in dividends (“participating securities”). Our vested stock options are considered “participating securities” because they include non-forfeitable rights to dividends. In applying the two-class method, earnings are allocated to both common stock shares and participating securities based on their respective weighted-average shares outstanding for the period. Diluted earnings per share information may include the additional effect of other securities, if dilutive, in which case the dilutive effect of such securities is calculated using the treasury stock method.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	12 Months Ended
	Sep. 30, 2013
Recent Accounting Pronouncements	'
	4	RECENT ACCOUNTING PRONOUNCEMENTS
	In June 2011, the Financial Accounting Standards Board (“FASB”) issued authoritative accounting guidance included in Accounting Standards Codification (“ASC”) Topic 220, “Comprehensive Income.” This guidance eliminates the option to report other comprehensive income and its components in the statement of changes in equity. Companies can elect to present items of net income and other comprehensive income in one continuous statement or in two separate, but consecutive, statements. The Company adopted the presentation guidance during fiscal 2013 and has elected to present two separate consecutive statements.
	In February 2013, the FASB issued authoritative accounting guidance included in ASC Topic 220, “Comprehensive Income.” This guidance requires all U.S. public companies to report the effect of items reclassified out of accumulated other comprehensive income on the respective line items of net income, net of tax, either on the face of the financial statements where net income is presented or in a tabular format in the notes to the financial statements. This presentation guidance is effective for the Company on October 1, 2013. The adoption of this guidance is not expected to have a material impact on the Company’s results of operations and financial condition.

Earnings_Per_Share_TwoClass_Me

Earnings Per Share (Two-Class Method)	12 Months Ended
Earnings Per Share (Two-Class Method)	Sep. 30, 2013
Earnings Per Share (Two-Class Method)	'
	5	EARNINGS PER SHARE (TWO-CLASS METHOD)
	The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):


			Fiscal Years Ended September 30,
			2013			2012			2011
	Numerator for earnings per share:
	Net income from continuing operations		$	302,789		$	324,969		$	152,225
	Less dividends paid on participating securities			(171,243	)		(3,299	)		(2,811	)

				131,546			321,670			149,414
	Net income from discontinued operations			—			—			19,909

	Net income applicable to common stock—basic and diluted		$	131,546		$	321,670		$	169,323

	Denominator for basic and diluted earnings per share under the two-class method:
	Weighted average common shares outstanding			52,258			50,996			49,888
	Vested options deemed participating securities			2,822			2,886			3,445

	Total shares for basic and diluted earnings per share			55,080			53,882			53,333

	Net earnings per share from continuing operations—basic and diluted		$	2.39		$	5.97		$	2.8
	Net earnings per share from discontinued operations—basic and diluted			—			—			0.37

	Net earnings per share		$	2.39		$	5.97		$	3.17

Sales_and_Trade_Accounts_Recei

Sales and Trade Accounts Receivable	12 Months Ended
Sales and Trade Accounts Receivable	Sep. 30, 2013
Sales and Trade Accounts Receivable	'
	6	SALES AND TRADE ACCOUNTS RECEIVABLE
	Sales—The Company’s sales and receivables are concentrated in the aerospace industry. TransDigm’s customers include: distributors of aerospace components; commercial airlines, large commercial transport and regional and business aircraft OEMs; various armed forces of the United States and friendly foreign governments; defense OEMs; system suppliers; and various other industrial customers.
	One customer accounted for approximately 12%, 13% and 14% of the Company’s net sales for the years ended September 30, 2013, 2012 and 2011, respectively. Export sales to customers, primarily in Western Europe, Canada and Asia, were $572.0 million during fiscal 2013, $508.8 million during fiscal 2012 and $305.5 million during fiscal 2011.
	Trade Accounts Receivable—Trade accounts receivable consist of the following at September 30 (in thousands):


			2013			2012
	Trade accounts receivable—gross		$	295,934		$	240,743
	Allowance for uncollectible accounts			(5,485	)		(4,960	)

	Trade accounts receivable—net		$	290,449		$	235,783

	At September 30, 2013, approximately 9% of the Company’s trade accounts receivable was due from one customer. In addition, approximately 36% of the Company’s trade accounts receivable was due from entities that principally operate outside of the United States. Credit is extended based on an evaluation of each customer’s financial condition and collateral is generally not required.

Inventories

Inventories	12 Months Ended
Inventories	Sep. 30, 2013
Inventories	'
	7	INVENTORIES
	Inventories consist of the following at September 30 (in thousands):


			2013			2012
	Raw materials and purchased component parts		$	274,510		$	203,809
	Work-in-progress			124,765			102,645
	Finished Goods			58,052			48,395

	Total			457,327			354,849
	Reserves for excess and obsolete inventory and LIFO			(43,746	)		(34,346	)

	Inventories—net		$	413,581		$	320,503

Property_Plant_and_Equipment

Property, Plant and Equipment	12 Months Ended
Property, Plant and Equipment	Sep. 30, 2013
Property, Plant and Equipment	'
	8	PROPERTY, PLANT AND EQUIPMENT
	Property, plant and equipment consist of the following at September 30 (in thousands):


			2013			2012
	Land and improvements		$	44,103		$	39,685
	Buildings and improvements			99,115			78,631
	Machinery, equipment and other			208,037			167,435
	Construction in progress			10,895			10,171

	Total			362,150			295,922
	Accumulated depreciation			(153,186	)		(123,185	)

	Property, plant and equipment—net		$	208,964		$	172,737

Intangible_Assets

Intangible Assets	12 Months Ended
Intangible Assets	Sep. 30, 2013
Intangible Assets	'
	9	INTANGIBLE ASSETS
	Intangible assets subject to amortization consist of the following at September 30 (in thousands):

			2013									2012
			Gross Carrying			Accumulated			Net			Gross Carrying			Accumulated		Net
			Amount			Amortization			Net			Amount			Amortization		Net
	Technology		$	801,010		$	143,196		$	657,814		$	723,231		$	105,995	$	617,236
	Order backlog			19,255			7,936			11,319			5,910			3,965		1,945
	Other			43,427			8,760			34,667			43,343			6,528		36,815

	Total		$	863,692		$	159,892		$	703,800		$	772,484		$	116,488	$	655,996

	Information regarding the amortization expense of amortizable intangible assets is detailed below (in thousands):
	Aggregate Amortization Expense:

	Years ended September 30,
	2013		$	46,208
	2012			44,535
	2011			40,368
	Estimated Amortization Expense:

	Years ending September 30,
	2014		$	54,431
	2015			41,766
	2016			41,766
	2017			41,766
	2018			41,766
	Intangible assets acquired during the year ended September 30, 2013 were as follows (in thousands):

			Cost			Amortization
			Cost			Period
	Intangible assets not subject to amortization:
	Goodwill		$	304,343
	Trademarks and trade names			22,761

				327,104

	Intangible assets subject to amortization:
	Technology			78,375			20 years
	Order backlog			16,072			1 year

				94,447			16.8 years

	Total		$	421,551

	The changes in the carrying amount of goodwill by segment for the fiscal years ended September 30, 2012 and 2013 were as follows (in thousands):

			Power &			Airframe			Non-			Total
			Control			Airframe			aviation			Total
	Balance at September 30, 2011		$	1,205,846		$	1,341,834		$	48,067		$	2,595,747
	Goodwill acquired during the year (Note 2)			70,870			401,500			1,525			473,895
	Divestitures (Note 3)			(2,012	)		(24,097	)		—			(26,109	)
	Other			(1	)		(8,023	)		(7	)		(8,031	)

	Balance at September 30, 2012			1,274,703			1,711,214			49,585			3,035,502
	Goodwill acquired during the year (Note 2)			284,889			13,969			5,485			304,343
	Other			7,334			(3,282	)		10			4,062

	Balance at September 30, 2013		$	1,566,926		$	1,721,901		$	55,080		$	3,343,907

Accrued_Liabilities

Accrued Liabilities	12 Months Ended
Accrued Liabilities	Sep. 30, 2013
Accrued Liabilities	'
	10	ACCRUED LIABILITIES
	Accrued liabilities consist of the following at September 30 (in thousands):


			2013		2012
	Interest		$	59,869	$	39,003
	Compensation and related benefits			50,830		39,446
	Interest rate swap agreements			6,950		9,800
	Product warranties			14,999		8,604
	Other			52,039		42,384

	Total		$	184,687	$	139,237

Debt

Debt	12 Months Ended
Debt	Sep. 30, 2013
Debt	'
	11	DEBT
	The Company’s long-term debt consists of the following at September 30 (in thousands):


			2013		2012
	Term loans		$	3,081,238	$	2,019,125
	Senior Subordinated Notes due 2021			500,000		—
	Senior Subordinated Notes due 2020			550,000		—
	Senior Subordinated Notes due 2018			1,600,000		1,600,000

				5,731,238		3,619,125
	Less current portion			31,045		20,500

	Long-term debt		$	5,700,193	$	3,598,625

	Revolving Credit Facility and Term Loan—On February 28, 2013, TransDigm Inc. entered into an Amendment and Restatement Agreement (the “Amendment and Restatement Agreement”) in which TransDigm amended and restated its previous credit facilities. The Amendment and Restatement Agreement provides for a $2,200 million term loan facility (the “Term Loan Facility”), which was fully drawn on February 28, 2013, and a $310 million revolving credit facility (the “Revolving Credit Facility” and together with the Term Loan Facility, the “2013 Credit Facility”).
	The proceeds of the Term Loan Facility were used to repay in full the outstanding term loans under the previous credit facility and the related transaction expenses associated therewith. The Term Loan Facility consists of two tranches of term loans: the tranche B term loans and the tranche C term loans, and the Revolving Credit Facility consists of two tranches: the revolving A commitments and the revolving B commitments. The tranche B term loans consist of $500 million in the aggregate and the tranche C term loans consist of $1,700 million in the aggregate. The tranche B term loans mature on February 14, 2017 and the tranche C term loans mature on February 28, 2020.
	On July 1, 2013, TransDigm Inc. entered into Amendment No. 1 (the “Amendment”) to the 2013 Credit Facility. The Amendment permits, among other things, a special dividend of up to $1.9 billion to the holders of TD Group’s common stock, par value $.01 per share, the issuance of the 2021 Notes (as defined below), changes to certain negative covenants under the 2013 Credit Facility, a modification to the financial covenant contained in the Revolving Credit Facility established pursuant to the 2013 Credit Facility and a modification to the incremental term loan facility established pursuant to the 2013 Credit Facility by excluding the Incremental Term Facility (as defined below) from the calculation of the availability thereunder.
	On July 1, 2013, in accordance with the terms of the 2013 Credit Facility, TransDigm Inc. entered into an Incremental Term Loan Assumption Agreement (the “Term Loan Assumption Agreement”). The Term Loan Assumption Agreement provides for incremental term loans in the form of additional Tranche C Term Loans in the aggregate principal amount of $900 million (the “Incremental Term Facility”). The Incremental Term Facility was fully drawn on July 1, 2013. The terms and conditions that apply to the Incremental Term Facility are substantially the same as the terms and conditions that apply to the existing tranche C term loans under the 2013 Credit Facility. The Term Loan Facility requires quarterly principal payments of approximately $7.8 million.
	The revolving A commitments are $32 million in the aggregate and the revolving B commitments are $278 million in the aggregate. The revolving A commitments mature on December 6, 2015 and the revolving B commitments mature on February 28, 2018. At September 30, 2013, the Company had $6.8 million letters of credit outstanding and $303.2 million of borrowings available under the 2013 Credit Facility.
	Under the terms of the 2013 Credit Facility, TransDigm is entitled on one or more occasions, subject to the satisfaction of certain conditions, to request additional commitments under the Revolving Credit Facility or additional term loans in the aggregate principal amount of up to $500 million to the extent that existing or new lenders agree to provide such additional term loans. In addition, TransDigm is entitled to convert, subject to certain conditions, the revolving A commitments to revolving B commitments.
	All of the indebtedness outstanding under the 2013 Credit Facility is guaranteed by TD Group and all of TransDigm’s current and future domestic restricted subsidiaries (other than immaterial subsidiaries). In addition, the obligations of TransDigm and the guarantors under the 2013 Credit Facility are secured ratably in accordance with each lender’s respective revolving and term loan commitments by a first priority security interest in substantially all of the existing and future property and assets, including inventory, equipment, general intangibles, intellectual property, investment property and other personal property (but excluding leasehold interests and certain other assets) of TransDigm and its existing and future domestic restricted subsidiaries (other than immaterial subsidiaries), and a first priority pledge of the capital stock of TransDigm and its subsidiaries (other than foreign subsidiaries and certain domestic subsidiaries, of which 65% of the voting capital stock is pledged).
	The interest rates per annum applicable to the loans under the 2013 Credit Facility will be, at TransDigm’s option, equal to either an alternate base rate or an adjusted LIBO rate for one, two, three or six-month (or to the extent agreed to by each relevant lender, nine or twelve-month) interest periods chosen by TransDigm, in each case plus an applicable margin percentage. The adjusted LIBO rate is subject to a floor of .75%. At September 30, 2013 the applicable interest rate was 3.50% on the tranche B term loan and 3.75% on the tranche C term loan.
	The Term Loan Facility requires mandatory prepayments of principal based on certain percentages of Excess Cash Flow (as defined in the 2013 Credit Facility), commencing 90 days after the end of each fiscal year, commencing with the fiscal year ending September 30, 2014, subject to certain exceptions. In addition, subject to certain exceptions (including, with respect to asset sales, the reinvestment in productive assets), TransDigm will be required to prepay the loans outstanding under the term loan facility at 100% of the principal amount thereof, plus accrued and unpaid interest, with the net cash proceeds of certain asset sales and issuance or incurrence of certain indebtedness. In addition, if, prior to February 28, 2014, the principal amount of the term loans are (i) prepaid substantially concurrently with the incurrence by TD Group, TransDigm or any its subsidiaries of new bank loans that have an effective yield lower than the yield in effect on the term loans so prepaid or (ii) received by a lender due to a mandatory assignment following the failure of such lender to consent to an amendment of the 2013 Credit Facility that has the effect of reducing the effective interest rate with respect to the term loans, such prepayment or receipt shall be accompanied by a premium of 1.0%.
	The 2013 Credit Facility contains certain covenants that limit the ability of TD Group, TransDigm and TransDigm’s restricted subsidiaries to, among other things: (i) incur or guarantee additional indebtedness or issue preferred stock; (ii) pay distributions on, redeem or repurchase capital stock or redeem or repurchase subordinated debt; (iii) make investments; (iv) sell assets; (v) enter into agreements that restrict distributions or other payments from restricted subsidiaries to TransDigm; (vi) incur or suffer to exist liens securing indebtedness; (vii) consolidate, merge or transfer all or substantially all of their assets; and (viii) engage in transactions with affiliates.
	The Company recorded refinancing costs of $30.3 million during fiscal 2013 representing debt issue costs expensed in conjunction with the refinancing of our previous credit facilities.
	At September 30, 2013, three forward-starting interest rate swap agreements were in place to swap variable rates on the 2013 Credit Facility for a fixed rate based on an aggregate notional amount of $353 million. These interest rate swap agreements converted the variable interest rate on the aggregate notional amount of the 2013 Credit Facility to a fixed rate of 5.17% (2.17% plus the 3% margin percentage) through June 30, 2015.
	On July 16, 2013, the Company entered into three forward-starting interest rate swap agreements beginning September 30, 2014 to hedge the variable interest rates on the 2013 Credit Facility for a fixed rate based on an aggregate notional amount of $1.0 billion through June 30, 2019. These forward-starting interest rate swap agreements will effectively convert the variable interest rate on the aggregate notional amount of the 2013 Credit Facility to a fixed rate of 5.4% (2.4% plus the 3% margin percentage) over the term of the interest rate swap agreements.
	Senior Subordinated Notes—On December 15, 2010, TransDigm issued $1.6 billion in aggregate principal amount of its 7 ³/₄% Senior Subordinated Notes due 2018 (the “2018 Notes”) at an issue price of 100% of the principal amount. Interest under the 2018 Notes is payable semi-annually on December 15 and June 15 of each year. The 2018 Notes mature on December 15, 2018, unless earlier redeemed or repurchased, and are subject to the terms and conditions as defined in the indenture governing the 2018 notes.
	TransDigm utilized a portion of the proceeds from the 2018 Notes to purchase its 7³/₄% Senior Subordinated Notes due 2014 (the “2014 Notes”). The Company recorded refinancing costs of $72.5 million during the fiscal year ended September 30, 2011 representing charges resulting from the refinancing of TransDigm’s entire debt structure.
	On October 15, 2012 TransDigm Inc. issued $550 million in aggregate principal amount of its 5¹/₂% Senior Subordinated Notes due 2020 (the “2020 Notes”) at an issue price of 100% of the principal amount. The 2020 Notes bear interest at the rate of 5¹/₂% per annum, which accrues from October 15, 2012 and is payable semiannually on April 15 and October 15 of each year. The 2020 Notes mature on October 15, 2020, unless earlier redeemed or repurchased, and are subject to the terms and conditions as defined in the indenture governing the 2020 notes.
	On July 1, 2013, TransDigm issued $500 million in aggregate principal amount of its 7¹/₂% Senior Subordinated Notes due 2021 (the “2021 Notes”) at an issue price of 100% of the principal amount. The 2021 Notes bear interest at the rate of 7¹/₂% per annum, which accrues from July 1, 2013 and is payable semiannually on January 15 and July 15 of each year, commencing on January 15, 2014. The 2021 Notes mature on July 15, 2021, unless earlier redeemed or repurchased, and are subject to the terms and conditions as defined in the indenture governing the 2021 Notes.
	The 2021 Notes, 2020 Notes and the 2018 Notes are subordinated to all of TransDigm’s existing and future senior debt, rank equally with all of its existing and future senior subordinated debt and rank senior to all of its future debt that is expressly subordinated to the 2021 Notes, 2020 Notes and 2018 Notes. The 2021 Notes, 2020 Notes and the 2018 Notes are guaranteed on a senior subordinated unsecured basis by TD Group and its wholly-owned domestic subsidiaries named in the Indenture. The guarantees of the 2021 Notes, 2020 Notes and the 2018 Notes are subordinated to all of the guarantors’ existing and future senior debt, rank equally with all of their existing and future senior subordinated debt and rank senior to all of their future debt that is expressly subordinated to the guarantees of the 2021 Notes, 2020 Notes and the 2018 Notes. The 2021 Notes, 2020 Notes and the 2018 Notes are structurally subordinated to all of the liabilities of TD Group’s non-guarantor subsidiaries. The 2021 Notes, 2020 Notes and the 2018 Notes contain many of the restrictive covenants included in the 2013 Credit Facility. TransDigm is in compliance with all the covenants contained in the 2021 Notes, 2020 Notes and 2018 Notes.
	At September 30, 2013, future maturities of long-term debt are as follows (in thousands):


	Years ended September 30,
	2014		$	31,045
	2015			31,045
	2016			31,045
	2017			507,295
	2018			26,045
	Thereafter			5,104,763

			$	5,731,238

Retirement_Plans

Retirement Plans	12 Months Ended
	Sep. 30, 2013
Retirement Plans	'
	12	RETIREMENT PLANS
	Defined Contribution Plans—The Company sponsors certain defined contribution employee savings plans that cover substantially all of the Company’s non-union employees. Under certain plans, the Company contributes a percentage of employee compensation and matches a portion of employee contributions. The cost recognized for such contributions for the years ended September 30, 2013, 2012 and 2011 was approximately $6.6 million, $4.9 million and $3.5 million, respectively.
	Defined Benefit Pension Plans—The Company maintains certain non-contributory defined benefit pension plans. The Company’s funding policy is to contribute actuarially determined amounts allowable under Internal Revenue Service regulations for the qualified plans. The Company uses a September 30th measurement date for its defined benefit pension plans.
	The Company maintains certain qualified, non-contributory defined benefit pension plans, which together cover certain union employees. The plans provide benefits of stated amounts for each year of service. The plan assets as of September 30, 2013 and 2012 were approximately $62.7 million and $60.1 million, respectively. The Company’s projected benefit obligation for these defined benefit pension plans at September 30, 2013 and 2012 was $66.6 million and $64.8 million, respectively. The total liability recognized at September 30, 2013 and 2012 was $3.9 million and $4.7 million, respectively. The net periodic pension cost recognized in the Consolidated Statements of Income for the years ended September 30, 2013, 2012, and 2011 was $0.8 million, $0.6 million, and $0.4 million, respectively.
	The Company has a non-qualified, non-contributory defined benefit pension plan, which covers certain retired employees. The plan is unfunded and provides defined benefits based on the final average salary of the employees as defined in the plan. The projected benefit obligation for this defined benefit pension plan and the total liability recognized in the Consolidated Balance Sheet at September 30, 2013 and 2012 was approximately $8.5 million and $9.5 million, respectively. The net periodic pension cost recognized in the Consolidated Statements of Income for the years ended September 30, 2013, 2012 and 2011 was $0.4 million, $0.4 million and less than $0.1 million, respectively.

Income_Taxes

Income Taxes	12 Months Ended
Income Taxes	Sep. 30, 2013
Income Taxes	'
	13	INCOME TAXES
	The Company’s income tax provision on income from continuing operations consists of the following for the periods shown below (in thousands):


			Fiscal Years Ended September 30,
			2013				2012			2011
	Current
	Federal		$	133,438			$	122,884		$	50,105
	State			8,933				12,855			7,109
	Foreign			5,943				2,361			1,310

				148,314				138,100			58,524

	Deferred			(2,614	)			24,800			18,676

			$	145,700			$	162,900		$	77,200


	The differences between the income tax provision on income from continuing operations at the federal statutory income tax rate and the tax provision shown in the accompanying consolidated statements of income for the periods shown below are as follows (in thousands):


			Fiscal Years Ended September 30,
			2013				2012			2011
	Tax at statutory rate of 35%		$	156,970			$	170,754		$	80,299
	State and local income taxes, net of federal benefit			4,858				5,221			3,576
	Domestic manufacturing deduction			(14,388	)			(9,126	)		(2,772	)
	Research and development credits—net			(2,189	)			(288	)		(2,303	)
	Other—net			449				(3,661	)		(1,600	)

	Income tax provision		$	145,700			$	162,900		$	77,200

	The components of the deferred taxes consist of the following at September 30 (in thousands):


			2013				2012
	Deferred tax assets:
	Employee benefits, compensation and other accrued obligations		$	48,932			$	31,711
	Inventory			18,912				12,330
	Net operating losses			14,916				14,637
	Tax credits			13,687				9,347
	Environmental			9,582				6,975
	Interest rate swaps			5,384				3,652
	Product warranties			3,826				3,560

	Total			115,239				82,212
	Less: Valuation allowance			(26,125	)			(16,150	)

	Total deferred tax assets			89,114				66,062

	Deferred tax liabilities:
	Intangible assets			408,755				361,226
	Property, plant and equipment			23,373				23,119
	Unremitted foreign earnings			5,069				3,714
	Other			6,036				5,765

	Total deferred tax liabilities			443,233				393,824

	Total net deferred tax liabilities		$	354,119			$	327,762

	At September 30, 2013, the Company has United Kingdom net operating loss carryforwards of approximately $7.1 million and state net operating loss carryforwards of approximately $272 million that expire in various years from 2014 to 2031. A valuation allowance has been established equal to the amount of the net operating losses that the Company believes will not be utilized. The Company had foreign tax credit carryforwards which generate a tax benefit of approximately $12.6 million that expire from 2018 to 2021. A valuation allowance has been established equal to the amount of the foreign tax credits that the Company believes will not be utilized.
	The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction, various state and local jurisdictions as well as foreign jurisdictions located in Belgium, China, France, Malaysia, Mexico, Singapore, Sri Lanka and the United Kingdom. The Company is no longer subject to U.S. federal examinations for years before fiscal 2011. AmSafe is subject to U.S. federal examinations for the 2008, 2009, 2010 and 2011 years. In addition, the Company is subject to state income tax examinations for fiscal years 2009 and later.

	The cumulative amount of the Company’s foreign undistributed net earnings for which no deferred taxes have been provided is approximately $6.7 million at September 30, 2013. The Company has no plans to repatriate such earnings in the foreseeable future.
A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):


		2013				2012
Balance at beginning of period		$	6,932			$	7,568
Additions based on tax positions related to the current year			—				738
Additions based on tax positions related to the prior year			151				272
Settlements with tax authorities			—				(2,528	)
Lapse in statute of limitations			(1,171	)			(664	)
Acquisitions			217				1,546

Balance at end of period		$	6,129			$	6,932

Unrecognized tax benefits at September 30, 2013 and 2012, the recognition of which would have an effect on the effective tax rate for each fiscal year, amounted to $5.7 million and $6.3 million, respectively. The Company classifies all income tax related interest and penalties as income tax expense, which were not significant for the years ended September 30, 2013, 2012 and 2011. As of September 30, 2013 and 2012, the Company accrued $0.9 million for the potential payment of interest and penalties. The Company anticipates no significant changes to its total unrecognized tax benefits through fiscal 2014.

Environmental_Liabilities

Environmental Liabilities	12 Months Ended
	Sep. 30, 2013
Environmental Liabilities	'
	14	ENVIRONMENTAL LIABILITIES
	Our operations and facilities are subject to a number of federal, state, local and foreign environmental laws and regulations that govern, among other things, discharges of pollutants into the air and water, the generation, handling, storage and disposal of hazardous materials and wastes, the remediation of contamination and the health and safety of our employees. Environmental laws and regulations may require that the Company investigate and remediate the effects of the release or disposal of materials at sites associated with past and present operations. Certain facilities and third-party sites utilized by subsidiaries of the Company have been identified as potentially responsible parties under the federal Superfund laws and comparable state laws. The Company is currently involved in the investigation and remediation of a number of sites under applicable laws.
	Estimates of the Company’s environmental liabilities are based on current facts, laws, regulations and technology. These estimates take into consideration the Company’s prior experience and professional judgment of the Company’s environmental advisors. Estimates of the Company’s environmental liabilities are further subject to uncertainties regarding the nature and extent of site contamination, the range of remediation alternatives available, evolving remediation standards, imprecise engineering evaluations and cost estimates, the extent of corrective actions that may be required and the number and financial condition of other potentially responsible parties, as well as the extent of their responsibility for the remediation.
	Accordingly, as investigation and remediation proceed, it is likely that adjustments in the Company’s accruals will be necessary to reflect new information. The amounts of any such adjustments could have a material adverse effect on the Company’s results of operations or cash flows in a given period. Based on currently available information, however, the Company does not believe that future environmental costs in excess of those accrued with respect to sites for which the Company has been identified as a potentially responsible party are likely to have a material adverse effect on the Company’s financial condition.
	Environmental liabilities are recorded when the liability is probable and the costs are reasonably estimable, which generally is not later than at completion of a feasibility study or when the Company has recommended a remedy or has committed to an appropriate plan of action. The liabilities are reviewed periodically and, as investigation and remediation proceed, adjustments are made as necessary. Liabilities for losses from environmental remediation obligations do not consider the effects of inflation and anticipated expenditures are not discounted to their present value. The liabilities are not reduced by possible recoveries from insurance carriers or other third parties, but do reflect anticipated allocations among potentially responsible parties at federal Superfund sites or similar state-managed sites, third party indemnity obligations, and an assessment of the likelihood that such parties will fulfill their obligations at such sites.
	The Company’s consolidated balance sheet includes environmental remediation obligations at September 30, 2013 and 2012 of $27.2 million and $19.1 million, respectively. The increase in the Company’s environmental remediation obligations during the year ended September 30, 2013 was primarily due to the estimated cost of environmental remediation obligations assumed in connection with the acquisition of Arkwin.

Capital_Stock

Capital Stock	12 Months Ended
	Sep. 30, 2013
Capital Stock	'
	15	CAPITAL STOCK
	Capital Stock—Authorized capital stock of TD Group consists of 224,400,000 shares of $.01 par value common stock and 149,600,000 shares of $.01 par value preferred stock. The total number of shares of common stock issued at September 30, 2013 and 2012 was 53,172,551 and 52,157,225, respectively. There were no shares of preferred stock outstanding at September 30, 2013 and 2012. The terms of the preferred stock have not been established.
	On August 22, 2011, the Board of Directors authorized a common share repurchase program, which was announced on August 23, 2011. Under the terms of the program, the Company may purchase up to a maximum aggregate value of $100 million of its shares of common stock. For the year ended September 30, 2012, the Company repurchased 11,300 shares of its common stock at a gross cost of approximately $0.8 million at a weighted-average price per share of $74.87 per share. No purchases were made under the program during the year ended September 30, 2013. On October 29, 2013, we announced a new program replacing that program permitting us to repurchase a portion of our outstanding shares not to exceed $200 million in the aggregate.
	Special Cash Dividends—On October 15, 2012 the Company’s board of directors authorized and declared a special cash dividend of $12.85 on each outstanding share of common stock and cash dividend equivalent payments to holders of options under its stock option plans (See Note 17). The special cash dividend amounting to approximately $664.3 million in the aggregate was paid in November 2012 and dividend equivalent payments amounting to approximately $35.4 million in the aggregate were paid in November and December 2012.
	On July 3, 2013 the Company’s board of directors authorized and declared a special cash dividend of $22.00 on each outstanding share of common stock and cash dividend equivalent payments to holders of options under its stock option plans. The special cash dividend amounting to approximately $1,155.8 million in the aggregate was paid in July 2013 and dividend equivalent payments amounting to approximately $95.1 million in the aggregate were paid in July and August 2013.

Segments

Segments	12 Months Ended
Segments	Sep. 30, 2013
Segments	'
	16	SEGMENTS
	During TransDigm’s third quarter ended June 29, 2013, the Company changed its internal management structure and its reporting structure of financial information used to assess performance and allocate resources. The Company’s businesses are organized and managed in three reporting segments: Power & Control, Airframe and Non-aviation.
	The Power & Control segment includes operations that primarily develop, produce and market systems and components that predominately provide power to or control power of the aircraft utilizing electronic, fluid, power and mechanical motion control technologies. Major product offerings include mechanical/electro-mechanical actuators and controls, ignition systems and engine technology, specialized pumps and valves, power conditioning devices and specialized AC/DC electric motors and generators. Primary customers of this segment are engine and power system and subsystem suppliers, airlines, third party maintenance suppliers, military buying agencies and repair depots. Products are sold in the original equipment and aftermarket market channels.

	The Airframe segment includes operations that primarily develop, produce and market systems and components that are used in non-power airframe applications utilizing airframe and cabin structure technologies. Major product offerings include engineered latching and locking devices, rods and locking devices, engineered connectors and elastomers, cockpit security components and systems, aircraft audio systems, specialized lavatory components, seatbelts and safety restraints, engineered interior surfaces and lighting and control technology. Primary customers of this segment are airframe manufacturers and cabin system suppliers and subsystem suppliers, airlines, third party maintenance suppliers, military buying agencies and repair depots. Products are sold in the original equipment and aftermarket market channels.
	The Non-aviation segment includes operations that primarily develop, produce and market products for non-aviation markets. Major product offerings include seatbelts and safety restraints for ground transportation applications, mechanical/electro-mechanical actuators and controls for space applications, and refueling systems for heavy equipment used in mining, construction and other industries. Primary customers of this segment are off road vehicle suppliers and subsystem suppliers, child restraint system suppliers, satellite and space system suppliers and manufacturers of heavy equipment used in mining, construction and other industries.
	The primary measurement used by management to review and assess the operating performance of each segment is EBITDA As Defined. The Company defines EBITDA As Defined as earnings before interest, taxes, depreciation and amortization plus certain non-operating items including refinancing costs, acquisition-related costs, transaction-related costs and non-cash compensation charges incurred in connection with the Company’s stock option plans. Acquisition-related costs represent accounting adjustments to inventory associated with acquisitions of businesses and product lines that were charged to cost of sales when the inventory was sold; costs incurred to integrate acquired businesses and product lines into the Company’s operations, facility relocation costs and other acquisition-related costs; transaction related costs comprising deal fees; legal, financial and tax diligence expenses and valuation costs that are required to be expensed as incurred and other acquisition accounting adjustments.
	EBITDA As Defined is not a measurement of financial performance under GAAP. Although we use EBITDA As Defined to assess the performance of our business and for various other purposes, the use of this non-GAAP financial measure as an analytical tool has limitations, and you should not consider it in isolation, or as a substitute for analysis of our results of operations as reported in accordance with GAAP.
	The Company’s segments are reported on the same basis used internally for evaluating performance and for allocating resources. The accounting policies for each segment are the same as those described in the summary of significant accounting policies in the Company’s consolidated financial statements. Intersegment sales and transfers are recorded at values based on market prices, which creates intercompany profit on intersegment sales or transfers that is eliminated in consolidation. Intersegment sales were insignificant for the fiscal years ended September 30, 2013, 2012 and 2011.
	The following table presents net sales by reportable segment (in thousands):


			Fiscal Years Ended September 30,
			2013			2012			2011
	Net sales to external customers
	Power & Control		$	872,325		$	776,342		$	668,920
	Airframe			951,436			843,643			505,257
	Non-aviation			100,639			80,223			31,844

			$	1,924,400		$	1,700,208		$	1,206,021


	The following table reconciles EBITDA As Defined by segment to consolidated income from continuing operations before income taxes (in thousands):


			Fiscal Years Ended September 30,
			2013			2012			2011
	EBITDA As Defined
	Power & Control		$	455,950		$	410,259		$	349,239
	Airframe			444,066			402,048			244,624
	Non-aviation			23,647			24,133			16,522

	Total segment EBITDA As Defined			923,663			836,440			610,385
	Unallocated corporate expenses			23,385			27,421			20,511

	Total Company EBITDA As Defined			900,278			809,019			589,874

	Depreciation and amortization			73,515			68,227			60,460
	Interest expense—net			270,685			211,906			185,256
	Acquisition-related costs			26,433			18,866			29,711
	Stock option expense			48,884			22,151			12,568
	Other nonrecurring charges			1,991			—			—
	Refinancing costs			30,281			—			72,454

	Income from continuing operations before income taxes		$	448,489		$	487,869		$	229,425

	The following table presents capital expenditures and depreciation and amortization by segment (in thousands):


			Fiscal Years Ended September 30,
			2013			2012			2011
	Capital expenditures
	Power & Control		$	13,149		$	9,436		$	8,740
	Airframe			19,121			13,730			7,914
	Non-aviation			2,773			1,920			522
	Corporate			492			160			850

			$	35,535		$	25,246		$	18,026

	Depreciation and amortization
	Power & Control		$	27,586		$	21,565		$	22,368
	Airframe			42,960			44,128			36,825
	Non-aviation			2,614			2,393			980
Corporate			355			141			287

		$	73,515		$	68,227		$	60,460



		September 30, 2013			September 30, 2012
Total assets
Power & Control		$	2,398,469		$	1,896,300
Airframe			2,958,974			2,932,229
Non-aviation			132,672			118,520
Corporate			658,764			512,568

		$	6,148,879		$	5,459,617

The Company’s sales principally originate from the United States, and the Company’s long-lived assets are principally located in the United States.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
Stock-Based Compensation	Sep. 30, 2013
Stock-Based Compensation	'
	17	STOCK-BASED COMPENSATION
	The Company’s stock compensation plans are designed to assist the Company in attracting, retaining, motivating and rewarding key employees, directors or consultants, and promoting the creation of long-term value for stockholders by closely aligning the interests of these individuals with those of the Company’s stockholders. The Company’s stock compensation plans provide for the granting of stock options, restricted stock and other stock-based incentives.
	The following table shows the expense recognized by the Company for stock-based compensation (in thousands):


			Fiscal Years Ended September 30,
			2013				2012			2011
	Stock option compensation expense:
	Performance vested stock options		$	48,884			$	22,151		$	12,568
	Restricted stock award amortization			—				—			6

			$	48,884			$	22,151		$	12,574

	During the year ended September 30, 2013, the Company recorded additional stock compensation expense of $24.5 million representing costs that would have been recognized over the remaining requisite service period of the award for options granted prior to October 1, 2011 that became fully vested under the market sweep provision, as discussed further below.
	The weighted-average grant date fair value of options granted during the fiscal years ended September 30, 2013, 2012 and 2011 was $45.53, $43.23 and $33.51, respectively.
	Compensation expense is recognized based upon probability assessments of awards that are expected to vest in future periods. Such probability assessments are subject to revision and, therefore, unrecognized compensation expense is subject to future changes in estimate. As of September 30, 2013, there was approximately $22.3 million of total unrecognized compensation expense related to non-vested awards expected to vest, which is expected to be recognized over a weighted-average period of three years.
	The fair value of the Company’s employee stock options was estimated at the date of grant using a Black-Scholes-Merton option-pricing model with the following weighted average assumptions for all options granted during the fiscal years ended:


			Fiscal Years Ended September 30,
			2013		2012		2011
	Risk-free interest rate		0.84% to 1.00%		1.10% to 1.50%		1.67% to 2.53%
	Expected life of options		6 years		6 years		6 years
	Expected dividend yield of stock		—		—		—
	Expected volatility of stock		35%		40%		40%
	The risk-free interest rate is based upon the Treasury bond rates as of the grant date. The average expected life of stock-based awards is based on vesting schedules and contractual terms. Expected volatility of stock was calculated using a rate based upon the historical volatility of both TransDigm’s common stock and the stock of publicly traded companies in the Company’s peer group in the aerospace industry. Notwithstanding the special cash dividends paid in October 2012 and July 2013, the Company historically has not paid regular cash dividends and does not anticipate paying regular cash dividends in future periods; thus, no dividend rate assumption is used.
	The total fair value of options vested during fiscal years ended September 30, 2013, 2012, and 2011 was $63.9 million, $11.4 million and $7.8 million, respectively.

	2006 Stock Incentive Plan
	In conjunction with the consummation of the initial public offering, a 2006 stock incentive plan was adopted by TD Group. In July 2008 and March 2011, the plan was amended to increase the number of shares available for issuance thereunder. TD Group has reserved 8,119,668 shares of its common stock for issuance to key employees, directors or consultants under the plan. Awards under the plan may be in the form of options, restricted stock or other stock-based awards. Options granted under the plan will expire no later than the tenth anniversary of the applicable date of grant of the options, and will have an exercise price of not less than the fair market value of our common stock on the date of grant. Restricted stock granted under the plan vests over three years.
	In connection with the $12.85 per share special cash dividend paid in November 2012, in order to take into account the earlier return of capital, the TD Group compensation committee adjusted the market-based vesting features in outstanding options pursuant to the authority granted to the committee under the TD Group stock incentive plan. Under this “market sweep” provision, unvested options granted prior to October 1, 2011 would accelerate and become fully vested if the closing price of the Company’s common stock exceeded $147.15 per share (originally $160 per share) on any 60 trading days during any consecutive 12-month period commencing March 1, 2013.
	In addition, in connection with the $12.85 per share special cash dividend paid in November 2012 and the $22.00 per share special cash dividend paid in July 2013, in order to take into account the earlier return of capital, the TD Group compensation committee adjusted the market-based vesting features in outstanding options pursuant to the authority granted to the committee under the TD Group stock incentive plan. Under this “market sweep” provision, unvested options granted in fiscal 2012 would accelerate and become fully vested if the closing price of the Company’s common stock exceeded $135.15 per share (originally $170 per share) on any 60 trading days during any consecutive 12-month period commencing two years from the date of grant. Options granted in fiscal 2013 do not contain such accelerated vesting provision.
	During June 2013, a total of 2,409,420 unvested options granted prior to October 1, 2011 with a weighted-average exercise price per option of $58.35 became fully vested under the market sweep provision. Due to the accelerated vesting, the Company recorded additional stock compensation expense of $24.5 million representing costs that would have been recognized over the remaining requisite service period of the award.
	In addition to shares issued pursuant to options exercised, during the fiscal year ended September 30, 2013, 713 shares of common stock were issued with a weighted-average grant date fair value of $146.37 as payment to directors in lieu of cash.

	Performance Vested Stock Options—All of the options granted through September 30, 2013 under the 2006 stock incentive plan have been pursuant to an equity incentive program adopted by the Company in 2008. Under the 2008 equity incentive program, all of the options granted will vest based on the Company’s achievement of established operating performance goals. The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2013:


			Number of				Weighted-Average			Weighted-Average			Aggregate
			Options				Exercise Price Per			Remaining			Intrinsic Value
							Option			Contractual Term
	Outstanding at September 30, 2012			4,726,195			$	56.24
	Granted			949,596				130.54
	Exercised			(419,042	)			37.36
	Forfeited			(108,900	)			95.2
	Expired			(43	)			41.79

	Outstanding at September 30, 2013			5,147,806			$	70.66			6.8 years		$	350,241,277

	Expected to vest			665,544			$	105.23			8.7 years		$	22,275,547

	Exercisable at September 30, 2013			3,850,765			$	53			6.1 years		$	330,010,560

	At September 30, 2013, there were 2,301,250 remaining shares available for award under TD Group’s 2006 stock incentive plan.
	2003 Stock Option Plan
	Certain executives and key employees of the Company were granted stock options under TD Group’s 2003 stock option plan. Upon the closing of the acquisition of the Company by Warburg Pincus in 2003, certain employees rolled over certain then-existing options to purchase shares of common stock of TransDigm Holdings. These employees were granted rollover options to purchase an aggregate of 3,870,152 shares of common stock of TD Group (after giving effect to the 149.60 for 1.00 stock split effected on March 14, 2006). All rollover options granted were fully vested on the date of grant. In addition to shares of common stock reserved for issuance upon the exercise of rollover options, an aggregate of 5,469,301 shares of TD Group’s common stock were reserved for issuance upon the exercise of new management options. In general, approximately 20% of all new management options vested based on employment service or a change in control. These time vested options had a graded vesting schedule of up to four years. Approximately 80% of all new management options vested (i) based upon the satisfaction of specified performance criteria, which is annual and cumulative EBITDA As Defined targets through 2008, or (ii) upon the occurrence of a change in control if the Investor Group (defined as Warburg Pincus and the other initial investors in TD Group) received a minimum specified rate of return. Unless terminated earlier, the options expire ten years from the date of grant.
	TD Group has reserved a total of 9,339,453 shares of its common stock for issuance to the Company’s employees under the plan, which had all been issued as of September 30, 2013.

	Time Vested Stock Options—The following table summarizes activity, pricing and other information for the Company’s time vested stock-based award activity during the fiscal year ended September 30, 2013:


			Number of				Weighted-Average			Weighted-Average			Aggregate
			Options				Exercise Price Per			Remaining			Intrinsic Value
			Option				Contractual Term
Outstanding at September 30, 2012				337,475			$	11.66
Granted			—				—
Exercised			(224,008	)			7.12
Forfeited			—				—

Outstanding at September 30, 2013			113,467			$	20.62			2.6 years		$	13,398,183

Exercisable at September 30, 2013			113,467			$	20.62			2.6 years		$	13,398,183

Performance Vested Stock Options—The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2013:


		Number of				Weighted-Average			Weighted-Average			Aggregate
		Options				Exercise Price Per			Remaining			Intrinsic Value
						Option			Contractual Term
Outstanding at September 30, 2012			714,647			$	14.56
Granted			77,829				130.09
Exercised			(355,467	)			11.42

Outstanding at September 30, 2013			437,009			$	37.69			3.6 years		$	44,142,279

Exercisable at September 30, 2013			359,180			$	17.66			2.4 years		$	43,475,147

The total intrinsic value of time, performance and rollover options exercised during the fiscal years ended September 30, 2013, 2012 and 2011 was $120.8 million, $137.5 million and $63.0 million, respectively.
Options Not Pursuant to a Shareholder Approved Plan
In addition to the stock options issued under the 2003 stock option plan and 2006 stock incentive plan, two members of the Company’s Board of Directors were also granted stock options of TD Group. All of the 134,040 options issued under these agreements, were exercised as of September 30, 2013.
Dividend Equivalent Plans
Pursuant to the Third Amended and Restated TransDigm Group Incorporated 2003 Stock Option Plan Dividend Equivalent Plan and the Second Amended and Restated TransDigm Group Incorporated 2006 Stock Incentive Plan Dividend Equivalent Plan, all of the options granted under the 2003 stock option plan and the 2006 stock incentive plan are entitled to certain dividend equivalent payments in the event of the declaration of a dividend by the Company. Options granted outside the plans to directors are also entitled to comparable dividend equivalents.
Dividend equivalent payments relating to the October 2009 special cash dividend of $7.65 per share that were paid in the first quarter of fiscal 2013, 2012 and 2011 were approximately $2.7 million, $3.3 million and $2.8 million, respectively.
As a result of the October 15, 2012 special cash dividend of $12.85 on each outstanding share of common stock, holders of options under its stock option plans received dividend equivalent payments amounting to approximately $35.4 million in the aggregate paid in November and December 2012.

As a result of the July 3, 2013 special cash dividend of $22.00 on each outstanding share of common stock, holders of options under its stock option plans received dividend equivalent payments amounting to approximately $95.1 million in the aggregate paid in July and August 2013.
In addition, during July 2013 the Company made $38.0 million of dividend equivalent payments related to the October 2009 special cash dividend payment of $7.65 per share and the October 2012 special cash dividend payment of $12.85 per share for unvested options granted prior to October 1, 2011 that became fully vested under the market sweep provisions thereof.

Leases

Leases	12 Months Ended
	Sep. 30, 2013
Leases	'
	18	LEASES
	TransDigm leases certain manufacturing facilities, equipment and vehicles with rental payments required through January 2051. Rental expense during the years ended September 30, 2013, 2012 and 2011 was $9.2 million, $7.9 million and $5.9 million, respectively.
	Future minimum rental commitments at September 30, 2013 under operating leases having initial or remaining non-cancelable lease terms exceeding one year are $9.3 million in fiscal 2014, $7.4 million in fiscal 2015, $6.7 million in fiscal 2016, $5.8 million in fiscal 2017, $4.7 million in fiscal 2018, and $16.3 million thereafter.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
Fair Value Measurements	Sep. 30, 2013
Fair Value Measurements	'
	19	FAIR VALUE MEASUREMENTS
	The following tables present our assets and liabilities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy. The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 inputs are quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs (other than quoted prices) that are observable for the asset or liability, either directly or indirectly. Level 3 inputs are unobservable inputs for the asset or liability. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.
	The following summarizes the carrying amounts and fair values of financial instruments as of September 30 (in thousands):


					September 30, 2013				September 30, 2012
			Level		Carrying		Fair Value		Carrying		Fair Value
			Level		Amount		Fair Value		Amount		Fair Value
	Assets:
	Cash and cash equivalents			1	$	564,740	$	564,740	$	440,524	$	440,524
	Liabilities:
	Interest rate swap agreements⁽¹⁾			2		6,950		6,950		9,800		9,800
	Interest rate swap agreements⁽²⁾			2		7,550		7,550		—		—
	Long-term debt:
	Term loans			2		3,081,238		3,065,000		2,019,125		2,037,000
	7³/₄% Senior Subordinated Notes due 2018			1		1,600,000		1,708,000		1,600,000		1,696,000
	5¹/₂% Senior Subordinated Notes due 2020			1		550,000		540,000		—		—
	7¹/₂% Senior Subordinated Notes due 2021			1		500,000		536,000		—		—

	-1	Included in Accrued liabilities on the Condensed Consolidated Balance Sheet.
	-2	Included in Other non-current liabilities on the Condensed Consolidated Balance Sheet.

	Interest rate swaps were measured at fair value using quoted market prices for the swap interest rate indexes over the term of the swap discounted to present value versus the fixed rate of the contract. The estimated fair value of the Company’s term loans was based on information provided by the agent under the Company’s senior secured credit facility. The estimated fair values of the Company’s 2018 Notes, 2020 Notes and 2021 Notes were based upon quoted market prices.

Derivatives_and_Hedging_Activi

Derivatives and Hedging Activities	12 Months Ended
	Sep. 30, 2013
Derivatives and Hedging Activities	'
	20	DERIVATIVES AND HEDGING ACTIVITIES
	The Company is exposed to, among other things, the impact of changes in interest rates in the normal course of business. The Company’s risk management program is designed to manage the exposure and volatility arising from these risks, and utilizes derivative financial instruments to offset a portion of these risks. The Company uses derivative financial instruments only to the extent necessary to hedge identified business risks and does not enter into such transactions for trading purposes. The Company generally does not require collateral or other security with counterparties to these financial instruments and is therefore subject to credit risk in the event of nonperformance; however, the Company monitors credit risk and currently does not anticipate nonperformance by other parties.
	Interest rate swap agreements are used to manage interest rate risk associated with floating-rate borrowings under our 2013 Credit Facility. The interest rate swap agreements utilized by the Company effectively modify the Company’s exposure to interest rate risk by converting a portion of the Company’s floating-rate debt to a fixed rate basis through the expiration date of the interest rate swap agreements, thereby reducing the impact of interest rate changes on future interest expense. These agreements involve the receipt of floating rate amounts in exchange for fixed rate interest payments over the term of the agreements without an exchange of the underlying principal amount. These derivative instruments that qualify as effective cash flow hedges under GAAP. For these cash flow hedges, the effective portion of the gain or loss from the financial instruments was initially reported as a component of accumulated other comprehensive income (loss) in stockholders’ equity and subsequently reclassified into earnings in the same line as the hedged item in the same period or periods during which the hedged item affected earnings.
	On July 16, 2013, the Company entered into three forward-starting interest rate swap agreements beginning September 30, 2014 to hedge the variable interest rates on the 2013 Credit Facility for a fixed rate based on an aggregate notional amount of $1.0 billion through June 30, 2019. These forward-starting interest rate swap agreements will effectively convert the variable interest rate on the aggregate notional amount of the 2013 Credit Facility to a fixed rate of 5.4% (2.4% plus the 3% margin percentage) over the term of the interest rate swap agreements.
	At September 30, 2013, three forward-starting interest rate swap agreements were in place to swap variable rates on the 2013 Credit Facility for a fixed rate based on an aggregate notional amount of $353 million. These interest rate swap agreements converted the variable interest rate on the aggregate notional amount of the 2013 Credit Facility to a fixed rate of 5.17% (2.17% plus the 3% margin percentage) through June 30, 2015.
	In conjunction with the refinancing of the 2011 Credit Facility, the Company no longer designated the interest rate swap agreements relating to the $353 million aggregate notional amount as cash flow hedges for accounting purposes. Accordingly, amounts previously recorded as a component of accumulated other comprehensive loss in stockholder’s equity will be amortized into earnings over the remaining period of the swap agreements. The net after-tax loss included in accumulated other comprehensive loss to be reclassified into interest expense over the remaining term of the swap agreement was $4.8 million at September 30, 2013.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
Accumulated Other Comprehensive Income (Loss)	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss)	'
	21	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
	Accumulated other comprehensive income (loss) consists of the following at September 30 (in thousands):


			2013			2012
	Interest rate swap agreements,		$	(9,722	)	$	(6,135	)
	net of taxes of $5.2 million for 2013 and $3.7 million for 2012		$	(9,722	)	$	(6,135	)
	Cumulative foreign currency translation adjustments			4,597			480
	Pension liability adjustments,			(1,391	)		(2,396	)
	net of taxes of $0.9 million for 2013 and $1.8 million for 2012			(1,391	)		(2,396	)

	Total		$	(6,516	)	$	(8,051	)

Quarterly_Financial_Data_Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
Quarterly Financial Data (Unaudited)	Sep. 30, 2013
Quarterly Financial Data (Unaudited)	'
	22	QUARTERLY FINANCIAL DATA (UNAUDITED)


			First Quarter		Second Quarter		Third Quarter		Fourth Quarter
			Ended		Ended		Ended		Ended
			December 29, 2012		March 30, 2013		June 29, 2013		September 30, 2013
			(in thousands, except per share amounts)
	Year Ended September 30, 2013
	Net sales		$	430,418	$	465,609	$	488,636	$	539,737
	Gross profit			238,547		259,310		268,986		282,719
	Net income			74,170		67,937		76,655		84,027
	Net earnings (loss) per share—basic and diluted⁽¹⁾		$	0.66	$	1.25	$	0.71	$	(0.20	)


			First Quarter		Second Quarter		Third Quarter		Fourth Quarter
			Ended		Ended		Ended		Ended
			December 31, 2011		March 31, 2012		June 30, 2012		September 30, 2012
			(in thousands, except per share amounts)
	Year Ended September 30, 2012
	Net sales		$	352,473	$	423,469	$	461,660	$	462,606
	Gross profit			199,555		236,040		253,302		256,820
	Net income			65,105		81,552		90,446		87,866
	Net earnings per share—basic and diluted⁽¹⁾		$	1.15	$	1.51	$	1.68	$	1.63

	-1	The sum of the earnings per share for the four quarters in a year does not necessarily equal the total year earnings per share.
	-2	The Company’s operating results include the results of operations of acquisitions from the effective date of each acquisition. See Note 2 to the Consolidated Financial Statements.

Supplemental_Guarantor_Informa

Supplemental Guarantor Information	12 Months Ended
Supplemental Guarantor Information	Sep. 30, 2013
Supplemental Guarantor Information	'
	23	SUPPLEMENTAL GUARANTOR INFORMATION
	TransDigm’s 2018 Notes, 2020 Notes and 2021 Notes are jointly and severally guaranteed, on a senior subordinated basis, by TD Group and TransDigm Inc.’s 100% Domestic Restricted Subsidiaries, as defined in the Indentures. The following supplemental condensed consolidating financial information presents, in separate columns, the balance sheets of the Company as of September 30, 2013 and September 30, 2012 and its statements of income and cash flows for the fiscal years ended September 30, 2013, 2012 and 2011 for (i) TransDigm Group on a parent only basis with its investment in subsidiaries recorded under the equity method, (ii) TransDigm Inc. including its directly owned operations and non-operating entities, (iii) the Subsidiary Guarantors on a combined basis, (iv) Non-Guarantor Subsidiaries and (v) the Company on a consolidated basis.

	TRANSDIGM GROUP INCORPORATED
	CONDENSED CONSOLIDATING BALANCE SHEET
	AS OF SEPTEMBER 30, 2013
	(Amounts in Thousands)


			TransDigm				TransDigm				Subsidiary			Non-Guarantor			Eliminations				Total
			Group				Inc.				Guarantors			Subsidiaries			Eliminations				Consolidated
	ASSETS
	CURRENT ASSETS:
	Cash and cash equivalents		$	1,313			$	536,863			$	7,900		$	18,664		$	—			$	564,740
	Trade accounts receivable—Net			—				16,332				251,272			24,567			(1,722	)			290,449
	Inventories—Net			—				26,353				359,518			28,633			(923	)			413,581
	Deferred income taxes			—				30,182				—			—			—				30,182
	Prepaid expenses and other			—				7,533				10,693			3,317			—				21,543

	Total current assets			1,313				617,263				629,383			75,181			(2,645	)			1,320,495
	INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES			(360,694	)			5,206,201				2,527,374			77,853			(7,450,734	)			—
	PROPERTY, PLANT AND EQUIPMENT—Net			—				15,471				178,193			15,300			—				208,964
	GOODWILL			—				67,245				3,192,519			84,143			—				3,343,907
	TRADEMARKS AND TRADE NAMES			—				19,377				434,066			32,247			—				485,690
	OTHER INTANGIBLE ASSETS—Net			—				22,130				663,881			19,249			(1,460	)			703,800
	DEBT ISSUE COSTS—Net			—				72,668				—			—			—				72,668
	OTHER			—				2,633				10,520			201			1				13,355

	TOTAL ASSETS		$	(359,381	)		$	6,022,988			$	7,635,936		$	304,174		$	(7,454,838	)		$	6,148,879

	LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
	CURRENT LIABILITIES:
	Current portion of long-term debt		$	—			$	31,045			$	—		$	—		$	—			$	31,045
	Accounts payable			—				14,353				82,661			11,481			(1,727	)			106,768
	Accrued liabilities			—				80,313				88,204			16,170			—				184,687

	Total current liabilities			—				125,711				170,865			27,651			(1,727	)			322,500
	LONG-TERM DEBT			—				5,700,193				—			—			—				5,700,193
	DEFERRED INCOME TAXES			—				384,301				—			—			—				384,301
	OTHER NON-CURRENT LIABILITIES			—				32,474				45,748			44			—				78,266

	Total liabilities			—				6,242,679				216,613			27,695			(1,727	)			6,485,260

	STOCKHOLDERS’ EQUITY (DEFICIT)			(359,381	)			(219,691	)			7,419,323			276,479			(7,453,111	)			(336,381	)

	TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)		$	(359,381	)		$	6,022,988			$	7,635,936		$	304,174		$	(7,454,838	)		$	6,148,879


	TRANSDIGM GROUP INCORPORATED
	CONDENSED CONSOLIDATING BALANCE SHEET
	AS OF SEPTEMBER 30, 2012
	(Amounts in Thousands)


			TransDigm				TransDigm				Subsidiary			Non-Guarantor			Eliminations				Total
			Group				Inc.				Guarantors			Subsidiaries			Eliminations				Consolidated
	ASSETS
	CURRENT ASSETS:
	Cash and cash equivalents		$	20,100			$	406,891			$	4,494		$	9,039		$	—			$	440,524
	Trade accounts receivable—Net			—				12,261				207,537			17,486			(1,501	)			235,783
	Inventories—Net			—				23,410				272,180			25,397			(484	)			320,503
	Deferred income taxes			—				29,134				—			—			—				29,134
	Prepaid expenses and other			—				9,585				12,626			2,376			—				24,587

Total current assets			20,100				481,281				496,837			54,298			(1,985	)			1,050,531
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES			1,198,734				4,720,602				2,055,938			43,745			(8,019,019	)			—
PROPERTY, PLANT AND EQUIPMENT—Net			—				15,685				144,177			12,875			—				172,737
GOODWILL			—				85,680				2,872,483			77,339			—				3,035,502
TRADEMARKS AND TRADE NAMES			—				19,377				416,490			31,747			—				467,614
OTHER INTANGIBLE ASSETS—Net			—				8,151				614,225			33,620			—				655,996
DEBT ISSUE COSTS—Net			—				62,190				—			—			—				62,190
OTHER			—				2,750				(27,249	)		39,546			—				15,047

TOTAL ASSETS		$	1,218,834			$	5,395,716			$	6,572,901		$	293,170		$	(8,021,004	)		$	5,459,617

LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES:
Current portion of long-term debt		$	—			$	20,500			$	—		$	—		$	—			$	20,500
Accounts payable			—				10,068				54,054			11,553			(1,497	)			74,178
Accrued liabilities			—				68,808				64,250			6,179			—				139,237

Total current liabilities			—				99,376				118,304			17,732			(1,497	)			233,915
LONG-TERM DEBT			—				3,598,625				—			—			—				3,598,625
DEFERRED INCOME TAXES			—				356,896				—			—			—				356,896
OTHER NON-CURRENT LIABILITIES			—				24,083				26,480			784			—				51,347

Total liabilities			—				4,078,980				144,784			18,516			(1,497	)			4,240,783

STOCKHOLDERS’ EQUITY			1,218,834				1,316,736				6,428,117			274,654			(8,019,507	)			1,218,834

TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY		$	1,218,834			$	5,395,716			$	6,572,901		$	293,170		$	(8,021,004	)		$	5,459,617


TRANSDIGM GROUP INCORPORATED
CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME FOR THE YEAR ENDED SEPTEMBER 30, 2013
(Amounts in thousands)


		TransDigm				TransDigm				Subsidiary			Non-Guarantor			Eliminations				Total
		Group				Inc.				Guarantors			Subsidiaries			Eliminations				Consolidated
NET SALES		$	—			$	110,608			$	1,699,742		$	120,706		$	(6,656	)		$	1,924,400
COST OF SALES			—				66,524				732,812			81,583			(6,081	)			874,838

GROSS PROFIT			—				44,084				966,930			39,123			(575	)			1,049,562
SELLING AND ADMINISTRATIVE EXPENSES			—				88,286				147,620			17,180			1,382				254,468
AMORTIZATION OF INTANGIBLE ASSETS			—				624				43,265			1,750			—				45,639

INCOME (LOSS) FROM OPERATIONS			—				(44,826	)			776,045			20,193			(1,957	)			749,455
INTEREST EXPENSE—Net			—				267,385				2,028			1,272			—				270,685
REFINANCING COSTS			—				30,281				—			—			—				30,281
EQUITY IN INCOME OF SUBSIDIARIES			(302,789	)			(505,199	)			—			—			807,988				—

INCOME BEFORE INCOME TAXES			302,789				162,707				774,017			18,921			(809,945	)			448,489
INCOME TAX PROVISION (BENEFIT)			—				(140,082	)			272,829			12,953			—				145,700

NET INCOME		$	302,789			$	302,789			$	501,188		$	5,968		$	(809,945	)		$	302,789

OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX			1,535				(4,515	)			950			5,100			(1,535	)			1,535

TOTAL COMPREHENSIVE INCOME		$	304,324			$	298,274			$	502,138		$	11,068		$	(811,480	)		$	304,324


TRANSDIGM GROUP INCORPORATED
CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME
FOR THE YEAR ENDED SEPTEMBER 30, 2012
(Amounts in Thousands)


		TransDigm				TransDigm				Subsidiary			Non-Guarantor			Eliminations				Total
		Group				Inc.				Guarantors			Subsidiaries			Eliminations				Consolidated
NET SALES		$	—			$	103,694			$	1,508,067		$	102,299		$	(13,852	)		$	1,700,208
COST OF SALES			—				64,394				622,056			81,390			(13,349	)			754,491

GROSS PROFIT			—				39,300				886,011			20,909			(503	)			945,717
SELLING AND ADMINISTRATIVE EXPENSES			—				61,214				125,261			15,234			—				201,709
AMORTIZATION OF INTANGIBLE ASSETS			—				624				41,937			1,672			—				44,233

INCOME (LOSS) FROM OPERATIONS			—				(22,538	)			718,813			4,003			(503	)			699,775
INTEREST EXPENSE—Net			—				208,384				2,268			1,254			—				211,906
EQUITY IN INCOME OF SUBSIDIARIES			(324,969	)			(465,683	)			—			—			790,652				—

INCOME BEFORE INCOME TAXES			324,969				234,761				716,545			2,749			(791,155	)			487,869
INCOME TAX PROVISION (BENEFIT)			—				(90,208	)			251,514			1,594			—				162,900

NET INCOME		$	324,969			$	324,969			$	465,031		$	1,155		$	(791,155	)		$	324,969

OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX			(4,774	)			(3,067	)			204			(1,911	)		4,774				(4,774	)

TOTAL COMPREHENSIVE INCOME (LOSS)		$	320,195			$	321,902			$	465,235		$	(756	)	$	(786,381	)		$	320,195


TRANSDIGM GROUP INCORPORATED
CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME
FOR THE YEAR ENDED SEPTEMBER 30, 2011
(Amounts in Thousands)


		TransDigm				TransDigm				Subsidiary			Non-Guarantor			Eliminations				Total
		Group				Inc.				Guarantors			Subsidiaries			Eliminations				Consolidated
NET SALES		$	—			$	81,944			$	1,097,662		$	31,649		$	(5,234	)		$	1,206,021
COST OF SALES			—				46,438				479,536			24,334			(5,472	)			544,836

GROSS PROFIT			—				35,506				618,126			7,315			238				661,185
SELLING AND ADMINISTRATIVE EXPENSES			—				44,754				85,796			3,172			(11	)			133,711
AMORTIZATION OF INTANGIBLE ASSETS			—				624				37,900			1,815			—				40,339

INCOME (LOSS) FROM OPERATIONS			—				(9,872	)			494,430			2,328			249				487,135
INTEREST EXPENSE—Net			—				183,175				777			1,304			—				185,256
REFINANCING COSTS			—				72,454				—			—			—				72,454
EQUITY IN INCOME OF SUBSIDIARIES			(172,134	)			(345,158	)			—			—			517,292				—

INCOME FROM CONTINUING OPERATIONS
BEFORE INCOME TAXES			172,134				79,657				493,653			1,024			(517,043	)			229,425
INCOME TAX PROVISION (BENEFIT)			—				(92,477	)			167,822			1,855			—				77,200

INCOME (LOSS) FROM CONTINUING OPERATIONS			172,134				172,134				325,831			(831	)		(517,043	)			152,225
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX			—				—				4,883			15,026			—				19,909

NET INCOME		$	172,134			$	172,134			$	330,714		$	14,195		$	(517,043	)		$	172,134

OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX			523				(1,194	)			(78	)		1,789			(523	)			523

TOTAL COMPREHENSIVE INCOME		$	172,657			$	170,940			$	330,636		$	15,984		$	(517,566	)		$	172,657


TRANSDIGM GROUP INCORPORATED
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED SEPTEMBER 30, 2013
(Amounts in thousands)


		TransDigm				TransDigm				Subsidiary			Non-Guarantor			Eliminations				Total
		Group				Inc.				Guarantors			Subsidiaries			Eliminations				Consolidated
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES		$	—			$	(95,862	)		$	565,957		$	8,703		$	(8,593	)		$	470,205
INVESTING ACTIVITIES:
Capital expenditures			—				(2,047	)			(29,727	)		(3,761	)		—				(35,535	)
Acquisition of business, net of cash acquired							(483,257	)			—			—			—				(483,257	)
Cash proceeds from sale of investment			—				16,350				—			—			—				16,350

Net cash used in investing activities			—				(468,954	)			(29,727	)		(3,761	)		—				(502,442	)

FINANCING ACTIVITIES:
Intercompany activities			1,884,828				(1,365,022	)			(532,824	)		4,425			8,593				—
Excess tax benefits related to share-based payment arrangements			66,201				—				—			—			—				66,201
Proceeds from exercise of stock options			21,534				—				—			—			—				21,534
Dividends paid			(1,991,350	)			—				—			—			—				(1,991,350	)
Proceeds from 2013 credit facility—net			—				3,064,014				—			—			—				3,064,014
Repayment on 2013 credit facility			—				(18,760	)			—			—			—				(18,760	)
Proceeds from 2011 credit facility—net			—				147,360				—			—			—				147,360
Repayment on 2011 credit facility			—				(2,169,125	)			—			—			—				(2,169,125	)
Proceeds from senior subordinated notes due 2021—net			—				494,765				—			—			—				494,765
Proceeds from senior subordinated notes due 2020—net			—				541,556				—			—			—				541,556

Net cash provided by (used in) financing activities			(18,787	)			694,788				(532,824	)		4,425			8,593				156,195

EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS			—				—				—			258			—				258

INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS			(18,787	)			129,972				3,406			9,625			—				124,216
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD			20,100				406,891				4,494			9,039			—				440,524

CASH AND CASH EQUIVALENTS, END OF PERIOD		$	1,313			$	536,863			$	7,900		$	18,664		$	—			$	564,740


TRANSDIGM GROUP INCORPORATED
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED SEPTEMBER 30, 2012
(Amounts in Thousands)


		TransDigm				TransDigm				Subsidiary			Non-Guarantor			Eliminations				Total
		Group				Inc.				Guarantors			Subsidiaries			Eliminations				Consolidated
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES		$	—			$	(119,491	)		$	523,759		$	9,466		$	151			$	413,885
INVESTING ACTIVITIES:
Capital expenditures			—				(1,865	)			(22,259	)		(1,122	)		—				(25,246	)
Acquisition of businesses, net of cash acquired			—				(868,696	)			—			—			—				(868,696	)
Cash proceeds from sale of business			—				17,650				—			—			—				17,650

Net cash used in investing activities			—				(852,911	)			(22,259	)		(1,122	)		—				(876,292	)

FINANCING ACTIVITIES:
Intercompany activities			(47,715	)			554,153				(499,121	)		(7,166	)		(151	)			—
Excess tax benefits related to share-based payment arrangements			50,555				—				—			—			—				50,555
Proceeds from exercise of stock options			15,710				—				—			—			—				15,710
Dividends paid			(3,299	)			—				—			—			—				(3,299	)
Treasury stock purchased			(846	)			—				—			—			—				(846	)
Proceeds from 2011 credit facility—net			—				484,316				—			—			—				484,316
Repayment on 2011 credit facility			—				(19,250	)			—			—			—				(19,250	)

Net cash provided by (used in) financing activities			14,405				1,019,219				(499,121	)		(7,166	)		(151	)			527,186

EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS			—				—				—			(438	)		—				(438	)

INCREASE IN CASH AND CASH EQUIVALENTS			14,405				46,817				2,379			740			—				64,341
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD			5,695				360,074				2,115			8,299			—				376,183

CASH AND CASH EQUIVALENTS, END OF PERIOD		$	20,100			$	406,891			$	4,494		$	9,039		$	—			$	440,524


TRANSDIGM GROUP INCORPORATED
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED SEPTEMBER 30, 2011
(Amounts in Thousands)


		TransDigm				TransDigm				Subsidiary			Non-Guarantor			Eliminations				Total
		Group				Inc.				Guarantors			Subsidiaries			Eliminations				Consolidated
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES		$	—			$	(164,846	)		$	409,483		$	14,102		$	1,647			$	260,386
INVESTING ACTIVITIES:
Capital expenditures			—				(2,639	)			(15,140	)		(247	)		—				(18,026	)
Acquisition of businesses, net of cash acquired			—				(1,650,363	)			—			—			—				(1,650,363	)
Cash proceeds from sales of discontinued operations			—				271,361				—			—			—				271,361

Net cash used in investing activities			—				(1,381,641	)			(15,140	)		(247	)		—				(1,397,028	)

FINANCING ACTIVITIES:
Intercompany activities			(28,997	)			431,648				(395,256	)		(5,748	)		(1,647	)			—
Excess tax benefits related to share-based payment arrangements			23,411				—				—			—			—				23,411
Proceeds from exercise of stock options			9,208				—				—			—			—				9,208
Dividends paid			(2,811	)			—				—			—			—				(2,811	)
Proceeds from 2011 credit facility—net							1,500,048				—			—			—				1,500,048
Repayment on 2011 credit facility							(11,625	)			—			—			—				(11,625	)
Proceeds from senior subordinated notes due 2018—net							1,582,184				—			—			—				1,582,184
Repurchase of senior subordinated notes due 2014							(1,041,894	)			—			—			—				(1,041,894	)
Repayment on 2006 credit facility							(780,000	)			—			—			—				(780,000	)

Net cash provided by (used in) financing activities			811				1,680,361				(395,256	)		(5,748	)		(1,647	)			1,278,521

EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS			—				—				—			192			—				192

INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS			811				133,874				(913	)		8,299			—				142,071
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD			4,884				226,200				3,028			—			—				234,112

CASH AND CASH EQUIVALENTS, END OF PERIOD		$	5,695			$	360,074			$	2,115		$	8,299		$	—			$	376,183

Valuation_and_Qualifying_Accou

Valuation and Qualifying Accounts	12 Months Ended
Valuation and Qualifying Accounts	Sep. 30, 2013
Valuation and Qualifying Accounts	'
	TRANSDIGM GROUP INCORPORATED
	VALUATION AND QUALIFYING ACCOUNTS
	FOR THE YEARS ENDED SEPTEMBER 30, 2013, 2012, AND 2011
	(Amounts in Thousands)


	Column A		Column B		Column C				Column D			Column E
			Balance at		Additions				Deductions from			Balance at
			Beginning of		Additions				Reserve⁽¹⁾			End of
	Description		Period		Charged to Costs		Acquisitions					Period
	Description				and Expenses		Acquisitions
	Year Ended September 30, 2013
	Allowance for doubtful accounts		$	4,960	$	1,566	$	1,137	$	(2,178	)	$	5,485
	Reserve for excess and obsolete inventory			36,081		14,159		148		(5,019	)		45,369
	Year Ended September 30, 2012
	Allowance for doubtful accounts			2,873		1,555		1,066		(534	)		4,960
	Reserve for excess and obsolete inventory			25,623		11,839		4,933		(6,314	)		36,081
	Year Ended September 30, 2011
	Allowance for doubtful accounts			2,270		570		599		(566	)		2,873
	Reserve for excess and obsolete inventory			18,251		8,361		415		(1,404	)		25,623

	-1	The amounts in this column represent charge-offs net of recoveries.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2013
Basis of Presentation and Consolidation	'
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation—The accompanying consolidated financial statements were prepared in conformity with generally accepted accounting principles in the United States (“GAAP”) and include the accounts of TD Group and subsidiaries. All significant intercompany balances and transactions have been eliminated.
Revenue Recognition and Related Allowances	'*Revenue Recognition and Related Allowances*—Revenue is recognized from the sale of products when title and risk of loss passes to the customer, which is generally at the time of shipment. Substantially all product sales are made pursuant to firm, fixed-price purchase orders received from customers. Provisions for estimated returns, uncollectible accounts and the cost of repairs under contract warranty provisions are provided for in the same period as the related revenues are recorded and are principally based on historical results modified, as appropriate, by the most current information available. Due to uncertainties in the estimation process, it is possible that actual results may vary from the estimates.
Shipping and Handling Costs	'
Shipping and Handling Costs	Shipping and Handling Costs—Shipping and handling costs are included in cost of sales in the Consolidated Statements of Income.
Research and Development Costs	'
Research and Development Costs	Research and Development Costs—The Company expenses research and development costs as incurred and classifies such amounts in selling and administrative expenses. The expense recognized for research and development costs for the years ended September 30, 2013, 2012 and 2011 was approximately $32.1 million, $27.9 million, and $19.3 million, respectively.
Cash Equivalents	'
Cash Equivalents	Cash Equivalents—The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents.
Allowance for Uncollectible Accounts	'
Allowance for Uncollectible Accounts	Allowance for Uncollectible Accounts—The Company reserves for amounts determined to be uncollectible based on specific identification of losses and estimated losses based on historical experience. The allowance also incorporates a provision for the estimated impact of disputes with customers. The determination of the amount of the allowance for doubtful accounts is subject to significant levels of judgment and estimation by management. If circumstances change or economic conditions deteriorate or improve, the allowance for doubtful accounts could increase or decrease.
Inventories	'
Inventories	Inventories—Inventories are stated at the lower of cost or market. Cost of inventories is determined by the average cost and the first-in, first-out (FIFO) methods for all locations except CEF Industries, LLC which determines the cost of inventories using the last-in, first-out (LIFO) method. Approximately 4% of the inventory was valued under the LIFO method at September 30, 2013. Provision for potentially obsolete or slow-moving inventory is made based on management’s analysis of inventory levels and future sales forecasts. In accordance with industry practice, all inventories are classified as current assets even though a portion of the inventories may not be sold within one year.
Property, Plant and Equipment	'
	Property, Plant and Equipment—Property, plant and equipment are stated at cost. Depreciation is computed using the straight-line method over the following estimated useful lives: land improvements from 10 to 20 years, buildings and improvements from 5 to 30 years, machinery and equipment from 2 to 10 years and furniture and fixtures from 3 to 10 years.
	Property, plant and equipment is assessed for potential impairment whenever indicators of impairment are present by determining whether the carrying value of the property can be recovered through projected, undiscounted cash flows from future operations over the property’s remaining estimated useful life. Any impairment recognized is the amount by which the carrying amount exceeds the fair value of the asset.
Debt Issue Costs, Premiums and Discounts	'
Debt Issue Costs, Premiums and Discounts	Debt Issue Costs, Premiums and Discounts—The cost of obtaining financing as well as premiums and discounts are amortized using the effective interest method over the terms of the respective obligations/securities.
Intangible Assets	'
	Intangible Assets—Intangible assets consist of identifiable intangibles acquired or recognized in accounting for the acquisitions (trademarks, trade names, technology, order backlog and other intangible assets) and goodwill. Goodwill and intangible assets that have indefinite useful lives (trademarks and trade names) are subject to annual impairment testing. Management determines fair value using a discounted future cash flow analysis or other accepted valuation techniques. The Company performs an annual impairment test for goodwill and other intangible assets as of the first day of the fourth fiscal quarter of each year, or more frequently, if an event occurs or circumstances change that would more likely than not reduce fair value below current value.
	A two-step impairment test is used to identify potential goodwill impairment. The first step of the goodwill impairment test, used to identify potential impairment, compares the fair value of a reporting unit (as defined) with its carrying amount, including goodwill. If the fair value of the reporting unit exceeds its carrying amount, goodwill is not considered impaired, and the second step of the goodwill impairment test is unnecessary. The second step measures the amount of impairment, if any, by comparing the carrying value of the goodwill associated with a reporting unit to the implied fair value of the goodwill derived from the estimated overall fair value of the reporting unit and the individual fair values of the other assets and liabilities of the reporting unit.
	GAAP requires that the annual, and any interim, impairment assessment be performed at the reporting unit level. The reporting unit level is one level below an operating segment. Substantially all goodwill was determined and recognized for each reporting unit pursuant to the accounting for the merger or acquisition as of the date of each transaction. With respect to acquisitions integrated into an existing reporting unit, any acquired goodwill is combined with the goodwill of the reporting unit.
	The impairment test for indefinite lived intangible assets consists of a comparison between their fair values and carrying values. If the carrying amounts of intangible assets that have indefinite useful lives exceed their fair values, an impairment loss will be recognized in an amount equal to the sum of any such excesses.
	The Company assesses the recoverability of its amortizable intangible assets only when indicators of impairment are present by determining whether the amortization over their remaining lives can be recovered through projected, undiscounted cash flows from future operations. Amortization of amortizable intangible assets is computed using the straight-line method over the following estimated useful lives: technology from 20 to 22 years, order backlog over one year, and other intangible assets over 20 years.
Stock Option Plans	'
Stock Option Plans	Stock Option Plans—The Company records stock-based compensation measured using the fair value method of accounting. Compensation expense is recorded over the vesting periods of the options. For options subject to accelerated vesting under the “market sweep” provision, additional stock compensation expense is recorded representing costs that would have been recognized over the remaining requisite service period of the award when the market condition is met.
Income Taxes	'
Income Taxes	Income Taxes—The Company accounts for income taxes using an asset and liability approach. Deferred taxes are recorded for the difference between the book and tax basis of various assets and liabilities. A valuation allowance is provided when it is more likely than not that some or all of a deferred tax asset will not be realized.
Contingencies	'
Contingencies	Contingencies—During the ordinary course of business, the Company is from time to time threatened with, or may become a party to, legal actions and other proceedings. While the Company is currently involved in certain legal proceedings, it believes the results of these proceedings will not have a material adverse effect on its financial condition, results of operations, or cash flows.
Discontinued Operations	'
Discontinued Operations	Discontinued Operations—During the year ended September 30, 2011, the Company sold, for aggregate cash proceeds of $271.4 million, two businesses which had been acquired as part of the McKechnie Aerospace acquisition and accounted for the sales as discontinued operations. Aggregate net sales of $24.1 million and losses from discontinued operations of $2.1 million were recognized during the period from the date of the McKechnie Aerospace acquisition through the respective dates of sale of the businesses. The consolidated statement of income for the year ended September 30, 2011 includes income from discontinued operations, net of tax, of $19.9 million, comprising the aggregate net after-tax gain of $22.0 million and the losses from discontinued operations of $2.1 million.
Estimates	'
Estimates	Estimates—The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Comprehensive Income (Loss)	'

	Comprehensive Income (Loss)—The term “comprehensive income (loss)” represents the change in stockholders’ equity from transactions and other events and circumstances resulting from non-stockholder sources. The Company’s accumulated other comprehensive income or loss, consisting principally of fair value adjustments to its interest rate swap agreements (net of tax), cumulative foreign currency translation adjustments and pension liability adjustments (net of tax), is reported separately in the accompanying consolidated statements of comprehensive income.
Earnings per Share	'
Earnings per Share	Earnings per Share—Earnings per share information is determined using the two-class method, which includes the weighted-average number of common shares outstanding during the period and other securities that participate in dividends (“participating securities”). Our vested stock options are considered “participating securities” because they include non-forfeitable rights to dividends. In applying the two-class method, earnings are allocated to both common stock shares and participating securities based on their respective weighted-average shares outstanding for the period. Diluted earnings per share information may include the additional effect of other securities, if dilutive, in which case the dilutive effect of such securities is calculated using the treasury stock method.

Acquisitions_Tables

Acquisitions (Tables) (AmSafe Global Holdings, Inc.)	12 Months Ended
Acquisitions (Tables) (AmSafe Global Holdings, Inc.)	Sep. 30, 2013
AmSafe Global Holdings, Inc.	'
Purchase Price Allocation Estimated Fair Values of Assets Acquired Liabilities Assumed	'
	The following table summarizes the purchase price allocation of the estimated fair values of the assets acquired and liabilities assumed at the transaction date (in thousands).


	Assets acquired:
	Current assets, excluding cash acquired	$	122,694
	Property, plant and equipment		20,787
	Intangible assets		270,500
	Goodwill		396,823
	Other		15,614

	Total assets acquired	$	826,418

	Liabilities assumed:
	Current liabilities	$	24,979
	Deferred income taxes—long term		48,626
	Other noncurrent liabilities		3,082

	Total liabilities assumed	$	76,687

	Net assets acquired	$	749,731

Earnings_Per_Share_TwoClass_Me1

Earnings Per Share (Two-Class Method) (Tables)	12 Months Ended
Earnings Per Share (Two-Class Method) (Tables)	Sep. 30, 2013
Computation of Basic and Diluted Earnings Per Share	'
	The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):


		Fiscal Years Ended September 30,
		2013			2012			2011
	Numerator for earnings per share:
	Net income from continuing operations	$	302,789		$	324,969		$	152,225
	Less dividends paid on participating securities		(171,243	)		(3,299	)		(2,811	)

			131,546			321,670			149,414
	Net income from discontinued operations		—			—			19,909

	Net income applicable to common stock—basic and diluted	$	131,546		$	321,670		$	169,323

	Denominator for basic and diluted earnings per share under the two-class method:
	Weighted average common shares outstanding		52,258			50,996			49,888
	Vested options deemed participating securities		2,822			2,886			3,445

	Total shares for basic and diluted earnings per share		55,080			53,882			53,333

	Net earnings per share from continuing operations—basic and diluted	$	2.39		$	5.97		$	2.8
	Net earnings per share from discontinued operations—basic and diluted		—			—			0.37

	Net earnings per share	$	2.39		$	5.97		$	3.17

Sales_and_Trade_Accounts_Recei1

Sales and Trade Accounts Receivable (Tables)	12 Months Ended
Sales and Trade Accounts Receivable (Tables)	Sep. 30, 2013
Content Trade Accounts Receivable	'
	Trade Accounts Receivable—Trade accounts receivable consist of the following at September 30 (in thousands):


		2013			2012
	Trade accounts receivable—gross	$	295,934		$	240,743
	Allowance for uncollectible accounts		(5,485	)		(4,960	)

	Trade accounts receivable—net	$	290,449		$	235,783

Inventories_Tables

Inventories (Tables)	12 Months Ended
Inventories (Tables)	Sep. 30, 2013
Inventories	'
	Inventories consist of the following at September 30 (in thousands):


		2013			2012
	Raw materials and purchased component parts	$	274,510		$	203,809
	Work-in-progress		124,765			102,645
	Finished Goods		58,052			48,395

	Total		457,327			354,849
	Reserves for excess and obsolete inventory and LIFO		(43,746	)		(34,346	)

	Inventories—net	$	413,581		$	320,503

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	12 Months Ended
Property, Plant and Equipment (Tables)	Sep. 30, 2013
Property, Plant and Equipment	'
	Property, plant and equipment consist of the following at September 30 (in thousands):


		2013			2012
	Land and improvements	$	44,103		$	39,685
	Buildings and improvements		99,115			78,631
	Machinery, equipment and other		208,037			167,435
	Construction in progress		10,895			10,171

	Total		362,150			295,922
	Accumulated depreciation		(153,186	)		(123,185	)

	Property, plant and equipment—net	$	208,964		$	172,737

Intangible_Assets_Tables

Intangible Assets (Tables)	12 Months Ended
Intangible Assets (Tables)	Sep. 30, 2013
Intangible Assets Subject to Amortization	'
	Intangible assets subject to amortization consist of the following at September 30 (in thousands):


		2013									2012
		Gross Carrying			Accumulated			Net			Gross Carrying			Accumulated		Net
		Amount			Amortization			Net			Amount			Amortization		Net
	Technology	$	801,010		$	143,196		$	657,814		$	723,231		$	105,995	$	617,236
	Order backlog		19,255			7,936			11,319			5,910			3,965		1,945
	Other		43,427			8,760			34,667			43,343			6,528		36,815

	Total	$	863,692		$	159,892		$	703,800		$	772,484		$	116,488	$	655,996

Information Regarding Amortization Expense of Amortizable Intangible Assets	'
	Information regarding the amortization expense of amortizable intangible assets is detailed below (in thousands):
	Aggregate Amortization Expense:


	Years ended September 30,
	2013	$	46,208
	2012		44,535
	2011		40,368
Information Regarding Amortization Expense of Amortizable Intangible Assets	'
	Estimated Amortization Expense:

	Years ending September 30,
	2014	$	54,431
	2015		41,766
	2016		41,766
	2017		41,766
	2018		41,766
Intangible Assets Acquired	'
	Intangible assets acquired during the year ended September 30, 2013 were as follows (in thousands):


		Cost			Amortization
		Cost			Period
	Intangible assets not subject to amortization:
	Goodwill	$	304,343
	Trademarks and trade names		22,761

			327,104

	Intangible assets subject to amortization:
	Technology		78,375			20 years
	Order backlog		16,072			1 year

			94,447			16.8 years

	Total	$	421,551

Summary of Changes in Carrying Value of Goodwill	'
	The changes in the carrying amount of goodwill by segment for the fiscal years ended September 30, 2012 and 2013 were as follows (in thousands):


		Power &			Airframe			Non-			Total
		Control			Airframe			aviation			Total
	Balance at September 30, 2011	$	1,205,846		$	1,341,834		$	48,067		$	2,595,747
	Goodwill acquired during the year (Note 2)		70,870			401,500			1,525			473,895
	Divestitures (Note 3)		(2,012	)		(24,097	)		—			(26,109	)
	Other		(1	)		(8,023	)		(7	)		(8,031	)

	Balance at September 30, 2012		1,274,703			1,711,214			49,585			3,035,502
	Goodwill acquired during the year (Note 2)		284,889			13,969			5,485			304,343
	Other		7,334			(3,282	)		10			4,062

	Balance at September 30, 2013	$	1,566,926		$	1,721,901		$	55,080		$	3,343,907

Accrued_Liabilities_Tables

Accrued Liabilities (Tables)	12 Months Ended
Accrued Liabilities (Tables)	Sep. 30, 2013
Accrued Liabilities	'
	Accrued liabilities consist of the following at September 30 (in thousands):


		2013		2012
	Interest	$	59,869	$	39,003
	Compensation and related benefits		50,830		39,446
	Interest rate swap agreements		6,950		9,800
	Product warranties		14,999		8,604
	Other		52,039		42,384

	Total	$	184,687	$	139,237

Debt_Tables

Debt (Tables)	12 Months Ended
Debt (Tables)	Sep. 30, 2013
Long-Term Debt	'
	The Company’s long-term debt consists of the following at September 30 (in thousands):


		2013		2012
	Term loans	$	3,081,238	$	2,019,125
	Senior Subordinated Notes due 2021		500,000		—
	Senior Subordinated Notes due 2020		550,000		—
	Senior Subordinated Notes due 2018		1,600,000		1,600,000

			5,731,238		3,619,125
	Less current portion		31,045		20,500

	Long-term debt	$	5,700,193	$	3,598,625

Future Maturities of Long-Term Debt	'
	At September 30, 2013, future maturities of long-term debt are as follows (in thousands):


	Years ended September 30,
	2014	$	31,045
	2015		31,045
	2016		31,045
	2017		507,295
	2018		26,045
	Thereafter		5,104,763

		$	5,731,238

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Sep. 30, 2013
Income Tax Provision on Income from Continuing Operations	'
	The Company’s income tax provision on income from continuing operations consists of the following for the periods shown below (in thousands):


		Fiscal Years Ended September 30,
		2013			2012			2011
	Current
	Federal	$	133,438		$	122,884		$	50,105
	State		8,933			12,855			7,109
	Foreign		5,943			2,361			1,310

			148,314			138,100			58,524

	Deferred		(2,614	)		24,800			18,676

		$	145,700		$	162,900		$	77,200

Differences between Income Tax Provision on Income from Continuing Operations at Federal Statutory Income Tax Rate and Tax Provision shown in Accompanying Consolidated Statements of Income	'
	The differences between the income tax provision on income from continuing operations at the federal statutory income tax rate and the tax provision shown in the accompanying consolidated statements of income for the periods shown below are as follows (in thousands):


		Fiscal Years Ended September 30,
		2013			2012			2011
	Tax at statutory rate of 35%	$	156,970		$	170,754		$	80,299
	State and local income taxes, net of federal benefit		4,858			5,221			3,576
	Domestic manufacturing deduction		(14,388	)		(9,126	)		(2,772	)
	Research and development credits—net		(2,189	)		(288	)		(2,303	)
	Other—net		449			(3,661	)		(1,600	)

	Income tax provision	$	145,700		$	162,900		$	77,200

Components of Deferred Taxes	'
	The components of the deferred taxes consist of the following at September 30 (in thousands):


		2013			2012
	Deferred tax assets:
	Employee benefits, compensation and other accrued obligations	$	48,932		$	31,711
	Inventory		18,912			12,330
	Net operating losses		14,916			14,637
	Tax credits		13,687			9,347
	Environmental		9,582			6,975
	Interest rate swaps		5,384			3,652
	Product warranties		3,826			3,560

	Total		115,239			82,212
	Less: Valuation allowance		(26,125	)		(16,150	)

	Total deferred tax assets		89,114			66,062

	Deferred tax liabilities:
	Intangible assets		408,755			361,226
	Property, plant and equipment		23,373			23,119
	Unremitted foreign earnings		5,069			3,714
	Other		6,036			5,765

	Total deferred tax liabilities		443,233			393,824

	Total net deferred tax liabilities	$	354,119		$	327,762

Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits	'
	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands):


		2013			2012
	Balance at beginning of period	$	6,932		$	7,568
	Additions based on tax positions related to the current year		—			738
	Additions based on tax positions related to the prior year		151			272
	Settlements with tax authorities		—			(2,528	)
	Lapse in statute of limitations		(1,171	)		(664	)
	Acquisitions		217			1,546

	Balance at end of period	$	6,129		$	6,932

Segments_Tables

Segments (Tables)	12 Months Ended
Segments (Tables)	Sep. 30, 2013
Net Sales by Reportable Segment	'
	The following table presents net sales by reportable segment (in thousands):


		Fiscal Years Ended September 30,
		2013		2012		2011
	Net sales to external customers
	Power & Control	$	872,325	$	776,342	$	668,920
	Airframe		951,436		843,643		505,257
	Non-aviation		100,639		80,223		31,844

		$	1,924,400	$	1,700,208	$	1,206,021

EBITDA Defined by Segment to Consolidated Income from Continuing Operations	'
	The following table reconciles EBITDA As Defined by segment to consolidated income from continuing operations before income taxes (in thousands):


		Fiscal Years Ended September 30,
		2013		2012		2011
	EBITDA As Defined
	Power & Control	$	455,950	$	410,259	$	349,239
	Airframe		444,066		402,048		244,624
	Non-aviation		23,647		24,133		16,522

	Total segment EBITDA As Defined		923,663		836,440		610,385
	Unallocated corporate expenses		23,385		27,421		20,511

	Total Company EBITDA As Defined		900,278		809,019		589,874

	Depreciation and amortization		73,515		68,227		60,460
	Interest expense—net		270,685		211,906		185,256
	Acquisition-related costs		26,433		18,866		29,711
	Stock option expense		48,884		22,151		12,568
	Other nonrecurring charges		1,991		—		—
	Refinancing costs		30,281		—		72,454

	Income from continuing operations before income taxes	$	448,489	$	487,869	$	229,425

Capital Expenditures and Depreciation and Amortization by Segment	'
	The following table presents capital expenditures and depreciation and amortization by segment (in thousands):


		Fiscal Years Ended September 30,
		2013		2012		2011
	Capital expenditures
	Power & Control	$	13,149	$	9,436	$	8,740
	Airframe		19,121		13,730		7,914
	Non-aviation		2,773		1,920		522
	Corporate		492		160		850

		$	35,535	$	25,246	$	18,026

	Depreciation and amortization
	Power & Control	$	27,586	$	21,565	$	22,368
	Airframe		42,960		44,128		36,825
	Non-aviation		2,614		2,393		980
	Corporate		355		141		287

		$	73,515	$	68,227	$	60,460

Total Assets by Segment	'

		September 30, 2013		September 30, 2012
	Total assets
	Power & Control	$	2,398,469	$	1,896,300
	Airframe		2,958,974		2,932,229
	Non-aviation		132,672		118,520
	Corporate		658,764		512,568

		$	6,148,879	$	5,459,617

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
Stock-Based Compensation (Tables)	Sep. 30, 2013
Expense Recognized by Company for Stock-Based Compensation	'
	The following table shows the expense recognized by the Company for stock-based compensation (in thousands):


		Fiscal Years Ended September 30,
		2013			2012		2011
	Stock option compensation expense:
	Performance vested stock options	$	48,884		$	22,151	$	12,568
	Restricted stock award amortization		—			—		6

		$	48,884		$	22,151	$	12,574

Weighted Average Assumptions for all Options Granted Estimated at Grant Date using Black-Scholes-Merton Option-Pricing Model	'
	The fair value of the Company’s employee stock options was estimated at the date of grant using a Black-Scholes-Merton option-pricing model with the following weighted average assumptions for all options granted during the fiscal years ended:


		Fiscal Years Ended September 30,
		2013		2012	2011
	Risk-free interest rate	0.84% to 1.00%		1.10% to 1.50%	1.67% to 2.53%
	Expected life of options	6 years		6 years	6 years
	Expected dividend yield of stock	—		—	—
	Expected volatility of stock	35%		40%	40%
Time Vested Stock Options	'
Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity	'
	The following table summarizes activity, pricing and other information for the Company’s time vested stock-based award activity during the fiscal year ended September 30, 2013:


		Number of			Weighted-Average		Weighted-Average		Aggregate
		Options			Exercise Price Per		Remaining		Intrinsic Value
					Option		Contractual Term
	Outstanding at September 30, 2012		337,475		$	11.66
	Granted		—			—
	Exercised		(224,008	)		7.12
	Forfeited		—			—

	Outstanding at September 30, 2013		113,467		$	20.62		2.6 years	$	13,398,183

	Exercisable at September 30, 2013		113,467		$	20.62		2.6 years	$	13,398,183

Performance Vested Stock Options \| 2006 Stock Incentive Plan	'
Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity	'
	The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2013:


		Number of			Weighted-Average		Weighted-Average		Aggregate
		Options			Exercise Price Per		Remaining		Intrinsic Value
					Option		Contractual Term
	Outstanding at September 30, 2012		4,726,195		$	56.24
	Granted		949,596			130.54
	Exercised		(419,042	)		37.36
	Forfeited		(108,900	)		95.2
	Expired		(43	)		41.79

	Outstanding at September 30, 2013		5,147,806		$	70.66		6.8 years	$	350,241,277

	Expected to vest		665,544		$	105.23		8.7 years	$	22,275,547

	Exercisable at September 30, 2013		3,850,765		$	53		6.1 years	$	330,010,560

Performance Vested Stock Options \| 2003 Stock Option Plan	'
Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity	'
	The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2013:


		Number of			Weighted-Average		Weighted-Average		Aggregate
		Options			Exercise Price Per		Remaining		Intrinsic Value
					Option		Contractual Term
	Outstanding at September 30, 2012		714,647		$	14.56
	Granted		77,829			130.09
	Exercised		(355,467	)		11.42

	Outstanding at September 30, 2013		437,009		$	37.69		3.6 years	$	44,142,279

	Exercisable at September 30, 2013		359,180		$	17.66		2.4 years	$	43,475,147

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
Fair Value Measurements (Tables)	Sep. 30, 2013
Carrying Amounts and Fair Values of Financial Instruments	'
	The following summarizes the carrying amounts and fair values of financial instruments as of September 30 (in thousands):


					September 30, 2013				September 30, 2012
			Level		Carrying		Fair Value		Carrying		Fair Value
			Level		Amount		Fair Value		Amount		Fair Value
	Assets:
	Cash and cash equivalents			1	$	564,740	$	564,740	$	440,524	$	440,524
	Liabilities:
	Interest rate swap agreements⁽¹⁾			2		6,950		6,950		9,800		9,800
	Interest rate swap agreements⁽²⁾			2		7,550		7,550		—		—
	Long-term debt:
	Term loans			2		3,081,238		3,065,000		2,019,125		2,037,000
	7³/₄% Senior Subordinated Notes due 2018			1		1,600,000		1,708,000		1,600,000		1,696,000
	5¹/₂% Senior Subordinated Notes due 2020			1		550,000		540,000		—		—
	7¹/₂% Senior Subordinated Notes due 2021			1		500,000		536,000		—		—

	-1	Included in Accrued liabilities on the Condensed Consolidated Balance Sheet.
	-2	Included in Other non-current liabilities on the Condensed Consolidated Balance Sheet.

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss)	'
	Accumulated other comprehensive income (loss) consists of the following at September 30 (in thousands):


		2013			2012
	Interest rate swap agreements,	$	(9,722	)	$	(6,135	)
	net of taxes of $5.2 million for 2013 and $3.7 million for 2012
	Cumulative foreign currency translation adjustments		4,597			480
	Pension liability adjustments,		(1,391	)		(2,396	)
	net of taxes of $0.9 million for 2013 and $1.8 million for 2012

	Total	$	(6,516	)	$	(8,051	)

Quarterly_Financial_Data_Unaud1

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
Quarterly Financial Data (Unaudited) (Tables)	Sep. 30, 2013
Quarterly Financial Data (Unaudited)	'

			First Quarter		Second Quarter		Third Quarter		Fourth Quarter
			Ended		Ended		Ended		Ended
			December 29, 2012		March 30, 2013		June 29, 2013		September 30, 2013
			(in thousands, except per share amounts)
	Year Ended September 30, 2013
	Net sales		$	430,418	$	465,609	$	488,636	$	539,737
	Gross profit			238,547		259,310		268,986		282,719
	Net income			74,170		67,937		76,655		84,027
	Net earnings (loss) per share—basic and diluted⁽¹⁾		$	0.66	$	1.25	$	0.71	$	(0.20	)


			First Quarter		Second Quarter		Third Quarter		Fourth Quarter
			Ended		Ended		Ended		Ended
			December 31, 2011		March 31, 2012		June 30, 2012		September 30, 2012
			(in thousands, except per share amounts)
	Year Ended September 30, 2012
	Net sales		$	352,473	$	423,469	$	461,660	$	462,606
	Gross profit			199,555		236,040		253,302		256,820
	Net income			65,105		81,552		90,446		87,866
	Net earnings per share—basic and diluted⁽¹⁾		$	1.15	$	1.51	$	1.68	$	1.63

	-1	The sum of the earnings per share for the four quarters in a year does not necessarily equal the total year earnings per share.
	-2	The Company’s operating results include the results of operations of acquisitions from the effective date of each acquisition. See Note 2 to the Consolidated Financial Statements.

Supplemental_Guarantor_Informa1

Supplemental Guarantor Information (Tables)	12 Months Ended
Supplemental Guarantor Information (Tables)	Sep. 30, 2013
Supplemental Condensed Consolidating Balance Sheet	'



	TRANSDIGM GROUP INCORPORATED
	CONDENSED CONSOLIDATING BALANCE SHEET
	AS OF SEPTEMBER 30, 2013
	(Amounts in Thousands)


			TransDigm				TransDigm				Subsidiary				Non-Guarantor				Eliminations				Total
			Group				Inc.				Guarantors				Subsidiaries				Eliminations				Consolidated
	ASSETS
	CURRENT ASSETS:
	Cash and cash equivalents		$	1,313			$	536,863			$	7,900			$	18,664			$	—			$	564,740
	Trade accounts receivable—Net			—				16,332				251,272				24,567				(1,722	)			290,449
	Inventories—Net			—				26,353				359,518				28,633				(923	)			413,581
	Deferred income taxes			—				30,182				—				—				—				30,182
	Prepaid expenses and other			—				7,533				10,693				3,317				—				21,543

	Total current assets			1,313				617,263				629,383				75,181				(2,645	)			1,320,495
	INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES			(360,694	)			5,206,201				2,527,374				77,853				(7,450,734	)			—
	PROPERTY, PLANT AND EQUIPMENT—Net			—				15,471				178,193				15,300				—				208,964
	GOODWILL			—				67,245				3,192,519				84,143				—				3,343,907
	TRADEMARKS AND TRADE NAMES			—				19,377				434,066				32,247				—				485,690
	OTHER INTANGIBLE ASSETS—Net			—				22,130				663,881				19,249				(1,460	)			703,800
	DEBT ISSUE COSTS—Net			—				72,668				—				—				—				72,668
	OTHER			—				2,633				10,520				201				1				13,355

	TOTAL ASSETS		$	(359,381	)		$	6,022,988			$	7,635,936			$	304,174			$	(7,454,838	)		$	6,148,879

	LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
	CURRENT LIABILITIES:
	Current portion of long-term debt		$	—			$	31,045			$	—			$	—			$	—			$	31,045
	Accounts payable			—				14,353				82,661				11,481				(1,727	)			106,768
	Accrued liabilities			—				80,313				88,204				16,170				—				184,687

	Total current liabilities			—				125,711				170,865				27,651				(1,727	)			322,500
	LONG-TERM DEBT			—				5,700,193				—				—				—				5,700,193
	DEFERRED INCOME TAXES			—				384,301				—				—				—				384,301
	OTHER NON-CURRENT LIABILITIES			—				32,474				45,748				44				—				78,266

	Total liabilities			—				6,242,679				216,613				27,695				(1,727	)			6,485,260

	STOCKHOLDERS’ EQUITY (DEFICIT)			(359,381	)			(219,691	)			7,419,323				276,479				(7,453,111	)			(336,381	)

	TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)		$	(359,381	)		$	6,022,988			$	7,635,936			$	304,174			$	(7,454,838	)		$	6,148,879


	TRANSDIGM GROUP INCORPORATED
	CONDENSED CONSOLIDATING BALANCE SHEET
	AS OF SEPTEMBER 30, 2012
	(Amounts in Thousands)


			TransDigm				TransDigm				Subsidiary				Non-Guarantor				Eliminations				Total
			Group				Inc.				Guarantors				Subsidiaries				Eliminations				Consolidated
	ASSETS
	CURRENT ASSETS:
	Cash and cash equivalents		$	20,100			$	406,891			$	4,494			$	9,039			$	—			$	440,524
	Trade accounts receivable—Net			—				12,261				207,537				17,486				(1,501	)			235,783
	Inventories—Net			—				23,410				272,180				25,397				(484	)			320,503
	Deferred income taxes			—				29,134				—				—				—				29,134
	Prepaid expenses and other			—				9,585				12,626				2,376				—				24,587

Total current assets			20,100				481,281				496,837				54,298				(1,985	)			1,050,531
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES			1,198,734				4,720,602				2,055,938				43,745				(8,019,019	)			—
PROPERTY, PLANT AND EQUIPMENT—Net			—				15,685				144,177				12,875				—				172,737
GOODWILL			—				85,680				2,872,483				77,339				—				3,035,502
TRADEMARKS AND TRADE NAMES			—				19,377				416,490				31,747				—				467,614
OTHER INTANGIBLE ASSETS—Net			—				8,151				614,225				33,620				—				655,996
DEBT ISSUE COSTS—Net			—				62,190				—				—				—				62,190
OTHER			—				2,750				(27,249	)			39,546				—				15,047

TOTAL ASSETS		$	1,218,834			$	5,395,716			$	6,572,901			$	293,170			$	(8,021,004	)		$	5,459,617

LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES:
Current portion of long-term debt		$	—			$	20,500			$	—			$	—			$	—			$	20,500
Accounts payable			—				10,068				54,054				11,553				(1,497	)			74,178
Accrued liabilities			—				68,808				64,250				6,179				—				139,237

Total current liabilities			—				99,376				118,304				17,732				(1,497	)			233,915
LONG-TERM DEBT			—				3,598,625				—				—				—				3,598,625
DEFERRED INCOME TAXES			—				356,896				—				—				—				356,896
OTHER NON-CURRENT LIABILITIES			—				24,083				26,480				784				—				51,347

Total liabilities			—				4,078,980				144,784				18,516				(1,497	)			4,240,783

STOCKHOLDERS’ EQUITY			1,218,834				1,316,736				6,428,117				274,654				(8,019,507	)			1,218,834

TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY		$	1,218,834			$	5,395,716			$	6,572,901			$	293,170			$	(8,021,004	)		$	5,459,617

Supplemental Condensed Consolidating Statement of Income and Comprehensive Income	'
	TRANSDIGM GROUP INCORPORATED
	CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME FOR THE YEAR ENDED SEPTEMBER 30, 2013
	(Amounts in thousands)


			TransDigm				TransDigm				Subsidiary				Non-Guarantor				Eliminations				Total
			Group				Inc.				Guarantors				Subsidiaries				Eliminations				Consolidated
	NET SALES		$	—			$	110,608			$	1,699,742			$	120,706			$	(6,656	)		$	1,924,400
	COST OF SALES			—				66,524				732,812				81,583				(6,081	)			874,838

	GROSS PROFIT			—				44,084				966,930				39,123				(575	)			1,049,562
	SELLING AND ADMINISTRATIVE EXPENSES			—				88,286				147,620				17,180				1,382				254,468
	AMORTIZATION OF INTANGIBLE ASSETS			—				624				43,265				1,750				—				45,639

	INCOME (LOSS) FROM OPERATIONS			—				(44,826	)			776,045				20,193				(1,957	)			749,455
	INTEREST EXPENSE—Net			—				267,385				2,028				1,272				—				270,685
	REFINANCING COSTS			—				30,281				—				—				—				30,281
	EQUITY IN INCOME OF SUBSIDIARIES			(302,789	)			(505,199	)			—				—				807,988				—

	INCOME BEFORE INCOME TAXES			302,789				162,707				774,017				18,921				(809,945	)			448,489
	INCOME TAX PROVISION (BENEFIT)			—				(140,082	)			272,829				12,953				—				145,700

	NET INCOME		$	302,789			$	302,789			$	501,188			$	5,968			$	(809,945	)		$	302,789

	OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX			1,535				(4,515	)			950				5,100				(1,535	)			1,535

	TOTAL COMPREHENSIVE INCOME		$	304,324			$	298,274			$	502,138			$	11,068			$	(811,480	)		$	304,324


	TRANSDIGM GROUP INCORPORATED
	CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME
	FOR THE YEAR ENDED SEPTEMBER 30, 2012
	(Amounts in Thousands)


			TransDigm				TransDigm				Subsidiary				Non-Guarantor				Eliminations				Total
			Group				Inc.				Guarantors				Subsidiaries				Eliminations				Consolidated
	NET SALES		$	—			$	103,694			$	1,508,067			$	102,299			$	(13,852	)		$	1,700,208
	COST OF SALES			—				64,394				622,056				81,390				(13,349	)			754,491

	GROSS PROFIT			—				39,300				886,011				20,909				(503	)			945,717
	SELLING AND ADMINISTRATIVE EXPENSES			—				61,214				125,261				15,234				—				201,709
	AMORTIZATION OF INTANGIBLE ASSETS			—				624				41,937				1,672				—				44,233

	INCOME (LOSS) FROM OPERATIONS			—				(22,538	)			718,813				4,003				(503	)			699,775
	INTEREST EXPENSE—Net			—				208,384				2,268				1,254				—				211,906
	EQUITY IN INCOME OF SUBSIDIARIES			(324,969	)			(465,683	)			—				—				790,652				—

	INCOME BEFORE INCOME TAXES			324,969				234,761				716,545				2,749				(791,155	)			487,869
	INCOME TAX PROVISION (BENEFIT)			—				(90,208	)			251,514				1,594				—				162,900

	NET INCOME		$	324,969			$	324,969			$	465,031			$	1,155			$	(791,155	)		$	324,969

	OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX			(4,774	)			(3,067	)			204				(1,911	)			4,774				(4,774	)

	TOTAL COMPREHENSIVE INCOME (LOSS)		$	320,195			$	321,902			$	465,235			$	(756	)		$	(786,381	)		$	320,195


	TRANSDIGM GROUP INCORPORATED
	CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME
	FOR THE YEAR ENDED SEPTEMBER 30, 2011
	(Amounts in Thousands)


		TransDigm				TransDigm				Subsidiary				Non-Guarantor				Eliminations				Total
		Group				Inc.				Guarantors				Subsidiaries				Eliminations				Consolidated
NET SALES		$	—			$	81,944			$	1,097,662			$	31,649			$	(5,234	)		$	1,206,021
COST OF SALES			—				46,438				479,536				24,334				(5,472	)			544,836

GROSS PROFIT			—				35,506				618,126				7,315				238				661,185
SELLING AND ADMINISTRATIVE EXPENSES			—				44,754				85,796				3,172				(11	)			133,711
AMORTIZATION OF INTANGIBLE ASSETS			—				624				37,900				1,815				—				40,339

INCOME (LOSS) FROM OPERATIONS			—				(9,872	)			494,430				2,328				249				487,135
INTEREST EXPENSE—Net			—				183,175				777				1,304				—				185,256
REFINANCING COSTS			—				72,454				—				—				—				72,454
EQUITY IN INCOME OF SUBSIDIARIES			(172,134	)			(345,158	)			—				—				517,292				—

INCOME FROM CONTINUING OPERATIONS
BEFORE INCOME TAXES			172,134				79,657				493,653				1,024				(517,043	)			229,425
INCOME TAX PROVISION (BENEFIT)			—				(92,477	)			167,822				1,855				—				77,200

INCOME (LOSS) FROM CONTINUING OPERATIONS			172,134				172,134				325,831				(831	)			(517,043	)			152,225
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX			—				—				4,883				15,026				—				19,909

NET INCOME		$	172,134			$	172,134			$	330,714			$	14,195			$	(517,043	)		$	172,134

OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX			523				(1,194	)			(78	)			1,789				(523	)			523

TOTAL COMPREHENSIVE INCOME		$	172,657			$	170,940			$	330,636			$	15,984			$	(517,566	)		$	172,657

Supplemental Condensed Consolidating Statement of Cash Flows	'
	TRANSDIGM GROUP INCORPORATED
	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
	FOR THE YEAR ENDED SEPTEMBER 30, 2013
	(Amounts in thousands)


			TransDigm				TransDigm				Subsidiary				Non-Guarantor				Eliminations				Total
			Group				Inc.				Guarantors				Subsidiaries				Eliminations				Consolidated
	NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES		$	—			$	(95,862	)		$	565,957			$	8,703			$	(8,593	)		$	470,205
	INVESTING ACTIVITIES:
	Capital expenditures			—				(2,047	)			(29,727	)			(3,761	)			—				(35,535	)
	Acquisition of business, net of cash acquired							(483,257	)			—				—				—				(483,257	)
	Cash proceeds from sale of investment			—				16,350				—				—				—				16,350

	Net cash used in investing activities			—				(468,954	)			(29,727	)			(3,761	)			—				(502,442	)

	FINANCING ACTIVITIES:
	Intercompany activities			1,884,828				(1,365,022	)			(532,824	)			4,425				8,593				—
	Excess tax benefits related to share-based payment arrangements			66,201				—				—				—				—				66,201
	Proceeds from exercise of stock options			21,534				—				—				—				—				21,534
	Dividends paid			(1,991,350	)			—				—				—				—				(1,991,350	)
	Proceeds from 2013 credit facility—net			—				3,064,014				—				—				—				3,064,014
	Repayment on 2013 credit facility			—				(18,760	)			—				—				—				(18,760	)
	Proceeds from 2011 credit facility—net			—				147,360				—				—				—				147,360
	Repayment on 2011 credit facility			—				(2,169,125	)			—				—				—				(2,169,125	)
	Proceeds from senior subordinated notes due 2021—net			—				494,765				—				—				—				494,765
	Proceeds from senior subordinated notes due 2020—net			—				541,556				—				—				—				541,556

	Net cash provided by (used in) financing activities			(18,787	)			694,788				(532,824	)			4,425				8,593				156,195

	EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS			—				—				—				258				—				258

	INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS			(18,787	)			129,972				3,406				9,625				—				124,216
	CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD			20,100				406,891				4,494				9,039				—				440,524

	CASH AND CASH EQUIVALENTS, END OF PERIOD		$	1,313			$	536,863			$	7,900			$	18,664			$	—			$	564,740


	TRANSDIGM GROUP INCORPORATED
	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
	FOR THE YEAR ENDED SEPTEMBER 30, 2012
	(Amounts in Thousands)


			TransDigm				TransDigm				Subsidiary				Non-Guarantor				Eliminations				Total
			Group				Inc.				Guarantors				Subsidiaries				Eliminations				Consolidated
	NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES		$	—			$	(119,491	)		$	523,759			$	9,466			$	151			$	413,885
	INVESTING ACTIVITIES:
	Capital expenditures			—				(1,865	)			(22,259	)			(1,122	)			—				(25,246	)
	Acquisition of businesses, net of cash acquired			—				(868,696	)			—				—				—				(868,696	)
	Cash proceeds from sale of business			—				17,650				—				—				—				17,650

	Net cash used in investing activities			—				(852,911	)			(22,259	)			(1,122	)			—				(876,292	)

	FINANCING ACTIVITIES:
	Intercompany activities			(47,715	)			554,153				(499,121	)			(7,166	)			(151	)			—
	Excess tax benefits related to share-based payment arrangements			50,555				—				—				—				—				50,555
	Proceeds from exercise of stock options			15,710				—				—				—				—				15,710
	Dividends paid			(3,299	)			—				—				—				—				(3,299	)
	Treasury stock purchased			(846	)			—				—				—				—				(846	)
	Proceeds from 2011 credit facility—net			—				484,316				—				—				—				484,316
	Repayment on 2011 credit facility			—				(19,250	)			—				—				—				(19,250	)

Net cash provided by (used in) financing activities			14,405				1,019,219				(499,121	)			(7,166	)			(151	)			527,186

EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS			—				—				—				(438	)			—				(438	)

INCREASE IN CASH AND CASH EQUIVALENTS			14,405				46,817				2,379				740				—				64,341
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD			5,695				360,074				2,115				8,299				—				376,183

CASH AND CASH EQUIVALENTS, END OF PERIOD		$	20,100			$	406,891			$	4,494			$	9,039			$	—			$	440,524


TRANSDIGM GROUP INCORPORATED
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
FOR THE YEAR ENDED SEPTEMBER 30, 2011
(Amounts in Thousands)


		TransDigm				TransDigm				Subsidiary				Non-Guarantor				Eliminations				Total
		Group				Inc.				Guarantors				Subsidiaries				Eliminations				Consolidated
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES		$	—			$	(164,846	)		$	409,483			$	14,102			$	1,647			$	260,386
INVESTING ACTIVITIES:
Capital expenditures			—				(2,639	)			(15,140	)			(247	)			—				(18,026	)
Acquisition of businesses, net of cash acquired			—				(1,650,363	)			—				—				—				(1,650,363	)
Cash proceeds from sales of discontinued operations			—				271,361				—				—				—				271,361

Net cash used in investing activities			—				(1,381,641	)			(15,140	)			(247	)			—				(1,397,028	)

FINANCING ACTIVITIES:
Intercompany activities			(28,997	)			431,648				(395,256	)			(5,748	)			(1,647	)			—
Excess tax benefits related to share-based payment arrangements			23,411				—				—				—				—				23,411
Proceeds from exercise of stock options			9,208				—				—				—				—				9,208
Dividends paid			(2,811	)			—				—				—				—				(2,811	)
Proceeds from 2011 credit facility—net							1,500,048				—				—				—				1,500,048
Repayment on 2011 credit facility							(11,625	)			—				—				—				(11,625	)
Proceeds from senior subordinated notes due 2018—net							1,582,184				—				—				—				1,582,184
Repurchase of senior subordinated notes due 2014							(1,041,894	)			—				—				—				(1,041,894	)
Repayment on 2006 credit facility							(780,000	)			—				—				—				(780,000	)

Net cash provided by (used in) financing activities			811				1,680,361				(395,256	)			(5,748	)			(1,647	)			1,278,521

EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS			—				—				—				192				—				192

INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS			811				133,874				(913	)			8,299				—				142,071
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD			4,884				226,200				3,028				—				—				234,112

CASH AND CASH EQUIVALENTS, END OF PERIOD		$	5,695			$	360,074			$	2,115			$	8,299			$	—			$	376,183

Description_of_The_Business_Ad

Description of The Business - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2013
Nature Of Business [Line Items]	'
Percentage of ownership in subsidiary	100.00%
7 3/4% Senior Subordinated Notes, Due 2018	'
Nature Of Business [Line Items]	'
Interest rate of senior subordinated debt	7.75%
5 1/2% Senior Subordinated Notes, Due 2020	'
Nature Of Business [Line Items]	'
Interest rate of senior subordinated debt	5.50%
7 1/2% Senior Subordinated Notes, Due 2021	'
Nature Of Business [Line Items]	'
Interest rate of senior subordinated debt	7.50%

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail) (USD $)

12 Months Ended

1 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Aug. 16, 2012

Dec. 29, 2012

Oct. 31, 2012

Sep. 17, 2012

Dec. 29, 2012

Feb. 15, 2012

Jun. 30, 2012

Dec. 09, 2011

Mar. 31, 2012

Jun. 28, 2013

Jun. 05, 2013

Aug. 31, 2011

Dec. 31, 2011

Dec. 31, 2010

Jun. 30, 2011

Dec. 06, 2010

Jun. 30, 2011

Distribution business

C-Safe LLC

Aero-Instruments Co., LLC

AmSafe Global Holdings, Inc.

Harco Laboratories, Incorporated

Whippany Actuation Systems LLC

Arkwin Industries, Inc

Aerosonic Corporation

Schneller Holdings LLC

Talley Actuation

McKechnie Aerospace Holdings, Inc.

Business Acquisition [Line Items]

Cash consideration paid to acquire business

$34,600,000

$749,700,000

$83,300,000

$149,500,000

$285,700,000

$39,800,000

$288,600,000

$93,600,000

$1,270,000,000

Amount of goodwill expected to be tax deductible

22,000,000

77,000,000

101,000,000

200,000

14,000,000

168,000,000

70,000,000

Business acquisition, purchase price adjustment paid

100,000

500,000

400,000

184,000,000

1,000,000

300,000

Cash proceeds from sale of business

17,650,000

17,800,000

5,000,000

Working capital adjustment

100,000

Total amount of business sold

16,400,000

Short term note receivable from business sold

11,400,000

GOODWILL

$3,343,907,000

$3,035,502,000

$2,595,747,000

$396,823,000

$56,000,000

$865,000,000

Estimated useful life of aircraft (in years)

'30 years

Purchase_Price_Allocation_Esti

Purchase Price Allocation Estimated Fair Values of Assets Acquired Liabilities Assumed (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Feb. 15, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	AmSafe Global Holdings, Inc.
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]	'	'	'	'
Current assets, excluding cash acquired	'	'	'	$122,694
Property, plant and equipment	'	'	'	20,787
Intangible assets	'	'	'	270,500
GOODWILL	3,343,907	3,035,502	2,595,747	396,823
Other	'	'	'	15,614
Total assets acquired	'	'	'	826,418
Current liabilities	'	'	'	24,979
Deferred income taxes-long term	'	'	'	48,626
Other noncurrent liabilities	'	'	'	3,082
Total liabilities assumed	'	'	'	76,687
Net assets acquired	'	'	'	$749,731

Recovered_Sheet1

Summary Of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Research and development expense	$32,100,000	$27,900,000	$19,300,000
Percentage of inventory valued under LIFO method	4.00%	'	'
Finite lived intangible asset useful life	'16 years 9 months 18 days	'	'
Proceeds from divestiture of business	'	'	271,361,000
Net sales	'	'	24,100,000
Loss from discontinued operations	'	'	2,100,000
Income from discontinued operations	'	'	19,909,000
Net gain on sales of discontinued operations, net of tax	'	'	$22,000,000
Technology Intangible Assets \| Minimum	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Finite lived intangible asset useful life	'20 years	'	'
Technology Intangible Assets \| Maximum	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Finite lived intangible asset useful life	'22 years	'	'
Order Backlog \| Minimum	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Finite lived intangible asset useful life	'1 year	'	'
Other intangible assets \| Minimum	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Finite lived intangible asset useful life	'20 years	'	'
Land Improvements \| Minimum	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Property, plant and equipment, useful life	'10 years	'	'
Land Improvements \| Maximum	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Property, plant and equipment, useful life	'20 years	'	'
Building Improvements \| Minimum	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Property, plant and equipment, useful life	'5 years	'	'
Building Improvements \| Maximum	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Property, plant and equipment, useful life	'30 years	'	'
Machinery and equipment \| Minimum	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Property, plant and equipment, useful life	'2 years	'	'
Machinery and equipment \| Maximum	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Property, plant and equipment, useful life	'10 years	'	'
Furniture and Fixtures \| Minimum	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Property, plant and equipment, useful life	'3 years	'	'
Furniture and Fixtures \| Maximum	'	'	'
Summary Of Significant Accounting Policies [Line Items]	'	'	'
Property, plant and equipment, useful life	'10 years	'	'

Computation_of_Basic_and_Dilut

Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Numerator for earnings per share:	'	'	'
Net income from continuing operations	$302,789	$324,969	$152,225
Less dividends paid on participating securities	-45,579	'	'
Income Loss From Continuing Operations Excluding Dividends	131,546	321,670	149,414
Net income from discontinued operations	'	'	19,909
Net income applicable to common stock-basic and diluted	131,546	321,670	169,323
Denominator for basic and diluted earnings per share under the two-class method:	'	'	'
Weighted average common shares outstanding	52,258	50,996	49,888
Vested options deemed participating securities	2,822	2,886	3,445
Total shares for basic and diluted earnings per share	55,080	53,882	53,333
Net earnings per share from continuing operations-basic and diluted	$2.39	$5.97	$2.80
Net earnings per share from discontinued operations-basic and diluted	'	'	$0.37
Net earnings per share	$2.39	$5.97	$3.17
Participating Securities	'	'	'
Numerator for earnings per share:	'	'	'
Less dividends paid on participating securities	($171,243)	($3,299)	($2,811)

Sales_and_Trade_Accounts_Recei2

Sales and Trade Accounts Receivable - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Trade Accounts Receivable Securitization and Sale Program [Line Items]	'	'	'
Percentage of net sales from one customer	12.00%	13.00%	14.00%
Percentage of trade accounts receivables from one company	9.00%	'	'
Trade accounts receivable due from foreign entities	36.00%	'	'
Export sales to customers, primarily in Western Europe, Canada and Asia	'	'	'
Trade Accounts Receivable Securitization and Sale Program [Line Items]	'	'	'
Export sales to customers	572	508.8	305.5

Content_Trade_Accounts_Receiva

Content Trade Accounts Receivable (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Trade Accounts Receivable Securitization and Sale Program [Line Items]	'	'
Trade accounts receivable-gross	$295,934	$240,743
Allowance for uncollectible accounts	-5,485	-4,960
Trade accounts receivable-net	$290,449	$235,783

Inventories_Detail

Inventories (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Inventory [Line Items]	'	'
Raw materials and purchased component parts	$274,510	$203,809
Work-in-progress	124,765	102,645
Finished Goods	58,052	48,395
Total	457,327	354,849
Reserves for excess and obsolete inventory and LIFO	-43,746	-34,346
Inventories-net	$413,581	$320,503

Property_Plant_and_Equipment_D

Property, Plant and Equipment (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Property, Plant, and Equipment Disclosure [Line Items]	'	'
Land and improvements	$44,103	$39,685
Buildings and improvements	99,115	78,631
Machinery, equipment and other	208,037	167,435
Construction in progress	10,895	10,171
Total	362,150	295,922
Accumulated depreciation	-153,186	-123,185
Property, plant and equipment-net	$208,964	$172,737

Intangible_Assets_Subjects_to_

Intangible Assets Subjects to Amortization (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	$863,692	$772,484
Accumulated Amortization	159,892	116,488
Net	703,800	655,996
Technology	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	801,010	723,231
Accumulated Amortization	143,196	105,995
Net	657,814	617,236
Order backlog	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	19,255	5,910
Accumulated Amortization	7,936	3,965
Net	11,319	1,945
Other intangible assets	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	43,427	43,343
Accumulated Amortization	8,760	6,528
Net	$34,667	$36,815

Aggregate_Amortization_Expense

Aggregate Amortization Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Amortization Expense [Line Items]	'	'	'
Aggregate amortization expense	$46,208	$44,535	$40,368
Estimated Amortization Expense, 2014	54,431	'	'
Estimated Amortization Expense, 2015	41,766	'	'
Estimated Amortization Expense, 2016	41,766	'	'
Estimated Amortization Expense, 2017	41,766	'	'
Estimated Amortization Expense, 2018	$41,766	'	'

Intangible_Assets_Acquired_Det

Intangible Assets Acquired (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013
Acquired Finite-Lived Intangible Assets [Line Items]	'
Intangible assets not subject to amortization	$327,104
Intangible assets subject to amortization	94,447
Total - Intangible assets both subject to and not subject to amortization	421,551
Amortization Period (in years)	'16 years 9 months 18 days
Goodwill	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Intangible assets not subject to amortization	304,343
Trademarks and trade names	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Intangible assets not subject to amortization	22,761
Technology	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Intangible assets subject to amortization	78,375
Amortization Period (in years)	'20 years
Order backlog	'
Acquired Finite-Lived Intangible Assets [Line Items]	'
Intangible assets subject to amortization	$16,072
Amortization Period (in years)	'1 year

Summary_of_Changes_in_Carrying

Summary of Changes in Carrying Value of Goodwill (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Goodwill [Line Items]	'	'
Goodwill, Beginning Balance	$3,035,502	$2,595,747
Goodwill acquired during the year (Note 2)	304,343	473,895
Divestitures (Note 3)	'	-26,109
Other	4,062	-8,031
Goodwill, Ending Balance	3,343,907	3,035,502
Power & Control	'	'
Goodwill [Line Items]	'	'
Goodwill, Beginning Balance	1,274,703	1,205,846
Goodwill acquired during the year (Note 2)	284,889	70,870
Divestitures (Note 3)	'	-2,012
Other	7,334	-1
Goodwill, Ending Balance	1,566,926	1,274,703
Airframe	'	'
Goodwill [Line Items]	'	'
Goodwill, Beginning Balance	1,711,214	1,341,834
Goodwill acquired during the year (Note 2)	13,969	401,500
Divestitures (Note 3)	'	-24,097
Other	-3,282	-8,023
Goodwill, Ending Balance	1,721,901	1,711,214
Non-aviation	'	'
Goodwill [Line Items]	'	'
Goodwill, Beginning Balance	49,585	48,067
Goodwill acquired during the year (Note 2)	5,485	1,525
Other	10	-7
Goodwill, Ending Balance	$55,080	$49,585

Accrued_Liabilities_Detail

Accrued Liabilities (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Schedule of Accrued Liabilities [Line Items]	'	'
Interest	$59,869	$39,003
Compensation and related benefits	50,830	39,446
Interest rate swap agreements	6,950	9,800
Product warranties	14,999	8,604
Other	52,039	42,384
Total	$184,687	$139,237

LongTerm_Debt_Detail

Long-Term Debt (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Debt Instrument [Line Items]	'	'
Total debt outstanding	$5,731,238	$3,619,125
Less current portion	31,045	20,500
LONG-TERM DEBT	5,700,193	3,598,625
Term Loans	'	'
Debt Instrument [Line Items]	'	'
Debt instrument, outstanding	3,081,238	2,019,125
7 1/2% Senior Subordinated Notes, Due 2021	'	'
Debt Instrument [Line Items]	'	'
Debt instrument, outstanding	500,000	'
5 1/2% Senior Subordinated Notes, Due 2020	'	'
Debt Instrument [Line Items]	'	'
Debt instrument, outstanding	550,000	'
7 3/4% Senior Subordinated Notes, Due 2018	'	'
Debt Instrument [Line Items]	'	'
Debt instrument, outstanding	$1,600,000	$1,600,000

LongTerm_Debt_Parenthetical_De

Long-Term Debt (Parenthetical) (Detail)	Sep. 30, 2013	Sep. 30, 2012
7 1/2% Senior Subordinated Notes, Due 2021	'	'
Debt Instrument [Line Items]	'	'
Debt instrument, maturity date	'2021	'2021
5 1/2% Senior Subordinated Notes, Due 2020	'	'
Debt Instrument [Line Items]	'	'
Debt instrument, maturity date	'2020	'2020
7 3/4% Senior Subordinated Notes, Due 2018	'	'
Debt Instrument [Line Items]	'	'
Debt instrument, maturity date	'2018	'2018

Debt_Additional_Information_De

Debt - Additional Information (Detail) (USD $)

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

Jul. 16, 2013

Feb. 28, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Jul. 31, 2013

Feb. 28, 2013

Sep. 30, 2013

Feb. 28, 2013

Jul. 31, 2013

Dec. 15, 2010

Oct. 15, 2012

Jul. 01, 2013

Derivative

Amended and Restated Credit Agreement

Tranche B

Tranche C

Revolving A commitments

Revolving B commitments

2013 Credit Facility

TransDigm's Foreign Subsidiaries

Incremental Term Facility

7 3/4% Senior Subordinated Notes, Due 2018

5 1/2% Senior Subordinated Notes, Due 2020

7 1/2% Senior Subordinated Notes, Due 2021

Derivative

Tranche B

Tranche C

Debt Instrument [Line Items]

Term loan facility amount

$147,360,000

$484,316,000

$1,500,048,000

$2,200,000,000

$900,000,000

Date the credit facility was fully drawn

28-Feb-13

1-Jul-13

Revolving credit facility amount

310,000,000

Debt instrument, face amount

5,731,238,000

500,000,000

1,700,000,000

1,600,000,000

550,000,000

500,000,000

Debt instrument, maturity date

14-Feb-17

28-Feb-20

Total special dividends

1,900,000,000

Common stock par value

$0.01

Quarterly principal payments

7,800,000

Revolving credit facility amount

32,000,000

278,000,000

Letter of credit outstanding

6,800,000

Borrowings available under credit facility

303,200,000

Revolving credit facility maturity date

6-Dec-15

28-Feb-18

Additional loan amount

500,000,000

Percentage of voting capital stock

65.00%

Floor basis spread on LIBO rate

0.75%

Applicable interest rate on term loan

3.50%

3.75%

Term loan mandatory principal prepayment commencement period from fiscal year (days)

Percentage of principal amount of term loan to be prepaid

100.00%

Prepayment premium

1.00%

Credit facility, covenants

'(i) incur or guarantee additional indebtedness or issue preferred stock; (ii) pay distributions on, redeem or repurchase capital stock or redeem or repurchase subordinated debt; (iii) make investments; (iv) sell assets; (v) enter into agreements that restrict distributions or other payments from restricted subsidiaries to TransDigm; (vi) incur or suffer to exist liens securing indebtedness; (vii) consolidate, merge or transfer all or substantially all of their assets; and (viii) engage in transactions with affiliates.

REFINANCING COSTS

30,281,000

72,454,000

Interest rate swap, notional amount

$1,000,000,000

$353,000,000

Number of forward stating interest rate swap agreement

Fixed rate of interest under interest rate swap

5.40%

5.17%

Interest rate swap agreements description

'2.4% plus the 3% margin percentage

'2.17% plus the 3% margin percentage

Percentage of principal amount of debt on issue price

100.00%

Future_Maturities_of_LongTerm_

Future Maturities of Long-Term Debt (Detail) (USD $)	Sep. 30, 2013
In Thousands, unless otherwise specified	Sep. 30, 2013
Long Term Debt Maturities Repayments Of Principal [Line Items]	'
Year ended September 30, 2014	$31,045
Year ended September 30, 2015	31,045
Year ended September 30, 2016	31,045
Year ended September 30, 2017	507,295
Year ended September 30, 2018	26,045
Thereafter	5,104,763
Total	$5,731,238

Retirement_Plans_Additional_In

Retirement Plans - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Defined contribution plan, cost recognized	$6.60	$4.90	$3.50
Non-contributory defined benefit pension plans, qualified	'The Company maintains certain qualified, non-contributory defined benefit pension plans, which together cover certain union employees.	'	'
Defined benefit plan, assets	62.7	60.1	'
Defined benefit plan, accumulated benefit obligation	66.6	64.8	'
Net period pension, cost recognized	0.8	0.6	0.4
Maximum	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Defined benefit plan, net periodic pension cost	'	'	0.1
Qualified Pension Plans	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Defined benefit pension plan, liabilities	3.9	4.7	'
Non-qualified	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Defined benefit pension plan, liabilities	8.5	9.5	'
Defined benefit plan, net periodic pension cost	$0.40	$0.40	'

Income_Tax_Provision_on_Income

Income Tax Provision on Income from Continuing Operations (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Current	'	'	'
Federal	$133,438	$122,884	$50,105
State	8,933	12,855	7,109
Foreign	5,943	2,361	1,310
Total Current	148,314	138,100	58,524
Deferred	-2,614	24,800	18,676
Income tax provision	$145,700	$162,900	$77,200

Differences_Between_Income_Tax

Differences Between Income Tax Provision on Income from Continuing Operations at Federal Statutory Income Tax Rate and Tax Provision shown in Accompanying Consolidated Statements of Income (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Schedule Of Effective Tax Rates Line Items	'	'	'
Tax at statutory rate of 35%	$156,970	$170,754	$80,299
State and local income taxes, net of federal benefit	4,858	5,221	3,576
Domestic manufacturing deduction	-14,388	-9,126	-2,772
Research and development credits-net	-2,189	-288	-2,303
Other-net	449	-3,661	-1,600
Income tax provision	$145,700	$162,900	$77,200

Differences_Between_Income_Tax1

Differences Between Income Tax Provision on Income from Continuing Operations at Federal Statutory Income Tax Rate and Tax Provision shown in Accompanying Consolidated Statements of Income (Parenthetical) (Detail)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Schedule Of Effective Tax Rates Line Items	'	'	'
Statutory tax rate	35.00%	35.00%	35.00%

Components_of_Deferred_Taxes_D

Components of Deferred Taxes (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]	'	'
Employee benefits, compensation and other accrued obligations	$48,932	$31,711
Inventory	18,912	12,330
Net operating losses	14,916	14,637
Tax credits	13,687	9,347
Environmental	9,582	6,975
Interest rate swaps	5,384	3,652
Product warranties	3,826	3,560
Total	115,239	82,212
Less: Valuation allowance	-26,125	-16,150
Total deferred tax assets	89,114	66,062
Intangible assets	408,755	361,226
Property, plant and equipment	23,373	23,119
Unremitted foreign earnings	5,069	3,714
Other	6,036	5,765
Total deferred tax liabilities	443,233	393,824
Total net deferred tax liabilities	$354,119	$327,762

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Income Tax Contingency [Line Items]	'	'
Deferred tax asset foreign tax credit carryforward	$12.60	'
Foreign tax credit carryforwards expiration, years	'2018 to 2021	'
Foreign undistributed net earnings for which no deferred taxes have been provided	6.7	'
Effect of unrecognized tax benefits on effective tax rate	5.7	6.3
Accrual for income tax penalties and interest	0.9	0.9
Minimum	'	'
Income Tax Contingency [Line Items]	'	'
Net tax loss carryforwards, expiration years	'2014	'
Maximum	'	'
Income Tax Contingency [Line Items]	'	'
Net tax loss carryforwards, expiration years	'2031	'
Federal and United Kingdom	'	'
Income Tax Contingency [Line Items]	'	'
Net tax loss carryforwards	7.1	'
State	'	'
Income Tax Contingency [Line Items]	'	'
Net tax loss carryforwards	$272	'

Reconciliation_of_Beginning_an

Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Schedule of Unrecognized Tax Benefits [Line Items]	'	'
Balance at beginning of period	$6,932	$7,568
Additions based on tax positions related to the current year	'	738
Additions based on tax positions related to the prior year	151	272
Settlements with tax authorities	'	-2,528
Lapse in statute of limitations	-1,171	-664
Acquisitions	217	1,546
Balance at end of period	$6,129	$6,932

Environmental_Liabilities_Addi

Environmental Liabilities - Additional Information (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Site Contingency [Line Items]	'	'
Environmental remediation obligations	$27.20	$19.10

Capital_Stock_Additional_Infor

Capital Stock - Additional Information (Detail) (USD $)

1 Months Ended

3 Months Ended

12 Months Ended

1 Months Ended

3 Months Ended

Jul. 31, 2013

Jul. 03, 2013

Oct. 31, 2012

Oct. 15, 2012

Aug. 23, 2011

Dec. 29, 2012

Dec. 31, 2011

Jan. 01, 2011

Sep. 30, 2013

Sep. 30, 2012

Oct. 29, 2013

Jul. 31, 2013

Nov. 30, 2012

Aug. 31, 2013

Jul. 31, 2013

Nov. 30, 2012

Dec. 29, 2012

Subsequent

Cash Dividends

Dividend Equivalent Payments

Shareholders Equity [Line Items]

Common stock, shares authorized

224,400,000

Common stock, par value

$0.01

Preferred stock, shares authorized

149,600,000

Preferred stock, par value

$0.01

Common stock, shares issued

53,172,551

52,157,225

Preferred stock, shares outstanding

Stock repurchase program, authorized amount

$100,000,000

$200,000,000

Shares repurchased under the program

11,300

Value of common stock repurchased

846,000

Weighted average price per share

$74.87

Special cash dividend paid per share

$22

$12.85

$34.85

$22

$12.85

Special cash dividend and dividend equivalents paid

$95,100,000

$35,400,000

$2.70

$3.30

$2.80

$1,155,800,000

$664,300,000

$95,100,000

$35,400,000

Net_Sales_by_Reportable_Segmen

Net Sales by Reportable Segment (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]	'	'	'
NET SALES	$1,924,400	$1,700,208	$1,206,021
Operating Segments \| Power & Control	'	'	'
Segment Reporting Information [Line Items]	'	'	'
NET SALES	872,325	776,342	668,920
Operating Segments \| Airframe	'	'	'
Segment Reporting Information [Line Items]	'	'	'
NET SALES	951,436	843,643	505,257
Operating Segments \| Non-aviation	'	'	'
Segment Reporting Information [Line Items]	'	'	'
NET SALES	$100,639	$80,223	$31,844

EBITDA_Defined_by_Segment_to_C

EBITDA Defined by Segment to Consolidated Income from Continuing Operations (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting, Reconciliation of Operating Income Segment to Consolidated [Line Items]	'	'	'
Earnings before interest taxes depreciation and amortization	$900,278	$809,019	$589,874
Depreciation and amortization	73,515	68,227	60,460
Interest expense-net	270,685	211,906	185,256
Acquisition-related costs	26,433	18,866	29,711
Stock option expense	48,884	22,151	12,568
Other nonrecurring charges	1,991	'	'
REFINANCING COSTS	30,281	'	72,454
Income from continuing operations before income taxes	448,489	487,869	229,425
Operating Segments	'	'	'
Segment Reporting, Reconciliation of Operating Income Segment to Consolidated [Line Items]	'	'	'
Earnings before interest taxes depreciation and amortization	923,663	836,440	610,385
Operating Segments \| Power & Control	'	'	'
Segment Reporting, Reconciliation of Operating Income Segment to Consolidated [Line Items]	'	'	'
Earnings before interest taxes depreciation and amortization	455,950	410,259	349,239
Depreciation and amortization	27,586	21,565	22,368
Operating Segments \| Airframe	'	'	'
Segment Reporting, Reconciliation of Operating Income Segment to Consolidated [Line Items]	'	'	'
Earnings before interest taxes depreciation and amortization	444,066	402,048	244,624
Depreciation and amortization	42,960	44,128	36,825
Operating Segments \| Non-aviation	'	'	'
Segment Reporting, Reconciliation of Operating Income Segment to Consolidated [Line Items]	'	'	'
Earnings before interest taxes depreciation and amortization	23,647	24,133	16,522
Depreciation and amortization	2,614	2,393	980
Corporate, Non-Segment	'	'	'
Segment Reporting, Reconciliation of Operating Income Segment to Consolidated [Line Items]	'	'	'
Unallocated corporate expenses	$23,385	$27,421	$20,511

Capital_Expenditures_and_Depre

Capital Expenditures and Depreciation and Amortization by Segment (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Segment Depreciation and Amortization [Line Items]	'	'	'
Capital expenditures	$35,535	$25,246	$18,026
Depreciation and amortization	73,515	68,227	60,460
Corporate	'	'	'
Segment Depreciation and Amortization [Line Items]	'	'	'
Capital expenditures	492	160	850
Depreciation and amortization	355	141	287
Operating Segments \| Power & Control	'	'	'
Segment Depreciation and Amortization [Line Items]	'	'	'
Capital expenditures	13,149	9,436	8,740
Depreciation and amortization	27,586	21,565	22,368
Operating Segments \| Airframe	'	'	'
Segment Depreciation and Amortization [Line Items]	'	'	'
Capital expenditures	19,121	13,730	7,914
Depreciation and amortization	42,960	44,128	36,825
Operating Segments \| Non-aviation	'	'	'
Segment Depreciation and Amortization [Line Items]	'	'	'
Capital expenditures	2,773	1,920	522
Depreciation and amortization	$2,614	$2,393	$980

Total_Assets_by_Segment_Detail

Total Assets by Segment (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Total Assets By Segment [Line Items]	'	'
Total assets	$6,148,879	$5,459,617
Corporate	'	'
Total Assets By Segment [Line Items]	'	'
Total assets	658,764	512,568
Operating Segments \| Power & Control	'	'
Total Assets By Segment [Line Items]	'	'
Total assets	2,398,469	1,896,300
Operating Segments \| Airframe	'	'
Total Assets By Segment [Line Items]	'	'
Total assets	2,958,974	2,932,229
Operating Segments \| Non-aviation	'	'
Total Assets By Segment [Line Items]	'	'
Total assets	$132,672	$118,520

Expense_Recognized_by_Company_

Expense Recognized by Company for Stock-Based Compensation (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Stock option compensation expense	$48,884	$22,151	$12,568
Restricted stock award amortization	'	'	6
Total stock-based compensation	48,884	22,151	12,574
Performance Vested Stock Options	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Stock option compensation expense	$48,884	$22,151	$12,568

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)

1 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

1 Months Ended

3 Months Ended

1 Months Ended

Jul. 31, 2013

Jul. 03, 2013

Oct. 31, 2012

Oct. 15, 2012

Oct. 31, 2009

Dec. 29, 2012

Dec. 31, 2011

Jan. 01, 2011

Jun. 29, 2013

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Sep. 30, 2013

Sep. 30, 2011

Sep. 30, 2013

Sep. 30, 2011

Jul. 31, 2013

Nov. 30, 2012

Aug. 31, 2013

Jul. 31, 2013

Nov. 30, 2012

Dec. 29, 2012

Jul. 31, 2013

2006 Stock Incentive Plan

2003 Stock Option Plan

2003 Stock Option Plan And 2006 Stock Incentive Plan

Options granted prior to October 1, 2011

Options granted in fiscal 2012

Cash Dividends

Dividend Equivalent Payments

Employee Service

Other Than Employee Service

Oct-09

Oct-12

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock based compensation expenses

$24,500,000

Fair value of options granted

$45.53

$43.23

$33.51

Unrecognized compensation cost related to non-vested awards expected to vest

22,300,000

Non-vested awards expected to vest weighted-average period

'3 years

Fair value of options vested

63,900,000

11,400,000

7,800,000

Issuance of common stock

8,119,668

9,339,453

Restricted stock grant period in years

'2 years

'3 years

'4 years

Threshold price minimum for accelerated vesting

$147.15

$160

$135.15

$170

Special cash dividend paid per share

$22

$12.85

$34.85

$22

$12.85

$7.65

$12.85

Number of trading days

'60 days

Unvested options granted

2,409,420

Weighted-average exercise price per option

$58.35

Share issued during period

713

Weighted average grant date fair value, share issued

$146.37

Shares available for award

2,301,250

3,870,152

Stock split, terms

'TD Group (after giving effect to the 149.60 for 1.00 stock split effected on March 14, 2006

Additional stock option granted

5,469,301

Percentage of vesting

20.00%

80.00%

Stock option, expiry period

'10 years

Total intrinsic value

120,800,000

137,500,000

63,000,000

Options issued

134,040

Special cash dividend paid per share

$22

$12.85

$7.65

Special cash dividend and dividend equivalents paid

$95,100,000

$35,400,000

$2.70

$3.30

$2.80

$1,155,800,000

$664,300,000

$95,100,000

$35,400,000

$38,000,000

Weighted_Average_Assumptions_u

Weighted Average Assumptions used to Estimate Fair Value of all Options at Grant Date using Black-Scholes-Merton Option-Pricing Model (Detail)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]	'	'	'
Risk-free interest rate, minimum	0.84%	1.10%	1.67%
Risk-free interest rate, maximum	1.00%	1.50%	2.53%
Expected life of options	'6 years	'6 years	'6 years
Expected dividend yield of stock	'	'	'
Expected volatility of stock	35.00%	40.00%	40.00%

Summary_of_Activity_Pricing_an

Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity (Detail) (USD $)	Jun. 29, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013
		2006 Stock Incentive Plan	2006 Stock Incentive Plan	2003 Stock Option Plan	2003 Stock Option Plan	2003 Stock Option Plan	2003 Stock Option Plan
			Performance Vested Stock Options				Performance Vested Stock Options
Number of Options	'	'	'	'	'	'	'
Number of Options, Outstanding, beginning of period	'	'	4,726,195	'	'	'	714,647
Number of Options, Granted	'	2,301,250	949,596	3,870,152	'	'	77,829
Number of Options, Exercised	'	'	-419,042	'	'	'	-355,467
Number of Options, Forfeited	'	'	-108,900	'	'	'	'
Number of Options, Expired	'	'	-43	'	'	'	'
Number of Options, Outstanding, end of period	'	'	5,147,806	'	'	'	437,009
Number of Options, Expected to vest	'	'	665,544	'	'	'	'
Number of Options Exercisable at end of period	'	'	3,850,765	'	'	'	359,180
Weighted average exercise price per option	'	'	'	'	'	'	'
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period	$58.35	'	$56.24	'	'	'	$14.56
Weighted-Average Exercise Price Per Option, Granted	'	'	$130.54	'	'	'	$130.09
Weighted-Average Exercise Price Per Option, Exercised	'	'	$37.36	'	'	'	$11.42
Weighted-Average Exercise Price Per Option, Forfeited	'	'	$95.20	'	'	'	'
Weighted-Average Exercise Price Per Option, Expired	'	'	$41.79	'	'	'	'
Weighted-Average Exercise Price Per Option, Outstanding, end of period	$58.35	'	$70.66	'	'	'	$37.69
Weighted-Average Exercise Price Per Option, Expected to vest	'	'	$105.23	'	'	'	'
Weighted-Average Exercise Price Per Option, Exercisable	'	'	$53	'	'	'	$17.66
Weighted average remaining contractual term	'	'	'	'	'	'	'
Weighted-Average Remaining Contractual Term, Outstanding, years	'	'	'6 years 9 months 18 days	'	'	'	'3 years 7 months 6 days
Weighted-Average Remaining Contractual Term, Expected to vest, years	'	'	'8 years 8 months 12 days	'	'	'	'
Weighted-Average Remaining Contractual Term, Exercisable, years	'	'	'6 years 1 month 6 days	'	'	'	'2 years 4 months 24 days
Aggregate intrinsic value	'	'	'	'	'	'	'
Aggregate Intrinsic Value, Outstanding	'	'	$350,241,277	'	'	'	$44,142,279
Aggregate Intrinsic Value, Expected to vest	'	'	22,275,547	'	'	'	'
Aggregate Intrinsic Value, Exercisable	'	'	$330,010,560	$120,800,000	$137,500,000	$63,000,000	$43,475,147

Summary_of_Activity_Pricing_an1

Summary of Activity, Pricing and Other Information for Time Vested Stock Based Award Activity (Detail) (USD $)	Jun. 29, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013
		2003 Stock Option Plan	2003 Stock Option Plan	2003 Stock Option Plan	2003 Stock Option Plan
					Time Vested Stock Options
Number of shares	'	'	'	'	'
Number of Options, Outstanding, beginning of period	'	'	'	'	337,475
Number of Options, Granted	'	3,870,152	'	'	'
Number of Options, Exercised	'	'	'	'	-224,008
Number of Options, Forfeited	'	'	'	'	'
Number of Options, Outstanding, end of period	'	'	'	'	113,467
Number of Options Exercisable at end of period	'	'	'	'	113,467
Weighted average exercise price per option	'	'	'	'	'
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period	$58.35	'	'	'	$11.66
Weighted-Average Exercise Price Per Option, Granted	'	'	'	'	'
Weighted-Average Exercise Price Per Option, Exercised	'	'	'	'	$7.12
Weighted-Average Exercise Price Per Option, Forfeited	'	'	'	'	'
Weighted-Average Exercise Price Per Option, Outstanding, end of period	$58.35	'	'	'	$20.62
Weighted-Average Exercise Price Per Option, Exercisable	'	'	'	'	$20.62
Weighted average remaining contractual term	'	'	'	'	'
Weighted-Average Remaining Contractual Term, Outstanding, years	'	'	'	'	'2 years 7 months 6 days
Weighted-Average Remaining Contractual Term, Exercisable, years	'	'	'	'	'2 years 7 months 6 days
Aggregate intrinsic value	'	'	'	'	'
Aggregate Intrinsic Value, Outstanding	'	'	'	'	$13,398,183
Aggregate Intrinsic Value, Exercisable	'	$120,800,000	$137,500,000	$63,000,000	$13,398,183

Leases_Additional_Information_

Leases - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Lease and Rental Expense [Line Items]	'	'	'
Expiry date of manufacturing facility leases	31-Jan-51	'	'
Annual rental expense	$9.20	$7.90	$5.90
Future minimum rental commitments in fiscal 2014	9.3	'	'
Future minimum rental commitments in fiscal 2015	7.4	'	'
Future minimum rental commitments in fiscal 2016	6.7	'	'
Future minimum rental commitments in fiscal 2017	5.8	'	'
Future minimum rental commitments in fiscal 2018	4.7	'	'
Future minimum rental commitments, due thereafter	$16.30	'	'

Carrying_Amounts_and_Fair_Valu

Carrying Amounts and Fair Values of Financial Instruments (Detail) (USD $)	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011	Oct. 02, 2010
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011	Oct. 02, 2010
Carrying Amounts and Fair Values of Financial Instruments [Line Items]	'		'		'	'
Cash and cash equivalents, Assets, Carrying Amount	$564,740		$440,524		$376,183	$234,112
Senior Subordinated Notes, Liabilities, Carrying Amount	5,731,238		3,619,125		'	'
Level 1	'		'		'	'
Carrying Amounts and Fair Values of Financial Instruments [Line Items]	'		'		'	'
Cash and cash equivalents, Assets, Carrying Amount	564,740		440,524		'	'
Cash and cash equivalents, Assets, Fair Value	564,740		440,524		'	'
Level 1 \| 7 3/4% Senior Subordinated Notes due 2018	'		'		'	'
Carrying Amounts and Fair Values of Financial Instruments [Line Items]	'		'		'	'
Senior Subordinated Notes, Liabilities, Carrying Amount	1,600,000		1,600,000		'	'
Senior Subordinated Notes, Liabilities, Fair Value	1,708,000		1,696,000		'	'
Level 1 \| 5 1/2% Senior Subordinated Notes, Due 2020	'		'		'	'
Carrying Amounts and Fair Values of Financial Instruments [Line Items]	'		'		'	'
Senior Subordinated Notes, Liabilities, Carrying Amount	550,000		'		'	'
Senior Subordinated Notes, Liabilities, Fair Value	540,000		'		'	'
Level 1 \| 7 1/2% Senior Subordinated Notes, Due 2021	'		'		'	'
Carrying Amounts and Fair Values of Financial Instruments [Line Items]	'		'		'	'
Senior Subordinated Notes, Liabilities, Carrying Amount	500,000		'		'	'
Senior Subordinated Notes, Liabilities, Fair Value	536,000		'		'	'
Level 2 \| Accrued Liabilities	'		'		'	'
Carrying Amounts and Fair Values of Financial Instruments [Line Items]	'		'		'	'
Interest rate swap agreements, Liabilities, Carrying Amount	6,950	[1]	9,800	[1]	'	'
Interest rate swap agreements, Liabilities, Fair Value	6,950	[1]	9,800	[1]	'	'
Level 2 \| Other Non-Current Liabilities	'		'		'	'
Carrying Amounts and Fair Values of Financial Instruments [Line Items]	'		'		'	'
Interest rate swap agreements, Liabilities, Carrying Amount	7,550	[2]	'		'	'
Interest rate swap agreements, Liabilities, Fair Value	7,550	[2]	'		'	'
Level 2 \| Term Loans	'		'		'	'
Carrying Amounts and Fair Values of Financial Instruments [Line Items]	'		'		'	'
Term loans, Liabilities, Carrying Amount	3,081,238		2,019,125		'	'
Term loans, Liabilities, Fair Value	$3,065,000		$2,037,000		'	'

[1]	Included in Accrued liabilities on the Condensed Consolidated Balance Sheet.
[2]	Included in Other non-current liabilities on the Condensed Consolidated Balance Sheet.

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail)	Sep. 30, 2013	Sep. 30, 2012
7 3/4% Senior Subordinated Notes due 2018	'	'
Carrying Amounts and Fair Values of Financial Instruments [Line Items]	'	'
Senior subordinate note, due date	'2018	'
5 1/2% Senior Subordinated Notes, Due 2020	'	'
Carrying Amounts and Fair Values of Financial Instruments [Line Items]	'	'
Senior subordinate note, due date	'2020	'2020
7 1/2% Senior Subordinated Notes, Due 2021	'	'
Carrying Amounts and Fair Values of Financial Instruments [Line Items]	'	'
Senior subordinate note, due date	'2021	'2021

Derivatives_and_Hedging_Activi1

Derivatives and Hedging Activities - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Jul. 16, 2013	Sep. 30, 2013
Derivative [Line Items]	'	'
Interest rate swap, notional amount	$1,000	'
Fixed rate of interest under interest rate swap	5.40%	'
Interest rate swap agreements description	'2.4% plus the 3% margin percentage	'
Derivative loss to be recognized	'	4.8
2013 Credit Facility	'	'
Derivative [Line Items]	'	'
Interest rate swap, notional amount	'	353
Fixed rate of interest under interest rate swap	'	5.17%
Interest rate swap agreements description	'	'2.17% plus the 3% margin percentage
New Senior Secured Credit Facility	'	'
Derivative [Line Items]	'	'
Interest rate swap, notional amount	'	$1,000
Fixed rate of interest under interest rate swap	'	5.40%
Interest rate swap agreements description	'	'2.4% plus the 3% margin percentage

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Interest rate swap agreements, net of taxes of $5.2 million for 2013 and $3.7 million for 2012	($9,722)	($6,135)
Cumulative foreign currency translation adjustments	4,597	480
Pension liability adjustments, net of taxes of $0.9 million for 2013 and $1.8 million for 2012	-1,391	-2,396
Total	($6,516)	($8,051)

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'
Interest rate swap, tax	$5.20	$3.70
Unamortized pension benefits, tax	$0.90	$1.80

Quarterly_Financial_Data_Unaud2

Quarterly Financial Data (Unaudited) (Detail) (USD $)

3 Months Ended

12 Months Ended

In Thousands, except Per Share data, unless otherwise specified

Sep. 30, 2013

Jun. 29, 2013

Mar. 30, 2013

Dec. 29, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2011

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2011

Quarterly Financial Data [Line Items]

NET SALES

$1,924,400

$1,700,208

$1,206,021

Gross profit

1,049,562

945,717

661,185

Net income

302,789

324,969

172,134

Net earnings (loss) per share-basic and diluted

$2.39

$5.97

$3.17

TransDigm Group

Quarterly Financial Data [Line Items]

NET SALES

539,737

488,636

465,609

430,418

462,606

461,660

423,469

352,473

Gross profit

282,719

268,986

259,310

238,547

256,820

253,302

236,040

199,555

Net income

$84,027

$76,655

$67,937

$74,170

$87,866

$90,446

$81,552

$65,105

$302,789

$324,969

$172,134

Net earnings (loss) per share-basic and diluted

($0.20)

[1]

$0.71

[1]

$1.25

[1]

$0.66

[1]

$1.63

[1]

$1.68

[1]

$1.51

[1]

$1.15

[1]

The sum of the earnings per share for the four quarters in a year does not necessarily equal the total year earnings per share.

Supplemental_Condensed_Consoli

Supplemental Condensed Consolidating Balance Sheet (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Oct. 02, 2010
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Oct. 02, 2010
Supplemental Guarantor Information [Line Items]	'	'	'	'
Cash and cash equivalents	$564,740	$440,524	$376,183	$234,112
Trade accounts receivable-Net	290,449	235,783	'	'
Inventories-Net	413,581	320,503	'	'
Deferred income taxes	30,182	29,134	'	'
Prepaid expenses and other	21,543	24,587	'	'
Total current assets	1,320,495	1,050,531	'	'
PROPERTY, PLANT AND EQUIPMENT-Net	208,964	172,737	'	'
GOODWILL	3,343,907	3,035,502	2,595,747	'
TRADEMARKS AND TRADE NAMES	485,690	467,614	'	'
OTHER INTANGIBLE ASSETS-Net	703,800	655,996	'	'
DEBT ISSUE COSTS-Net	72,668	62,190	'	'
OTHER	13,355	15,047	'	'
TOTAL ASSETS	6,148,879	5,459,617	'	'
Current portion of long-term debt	31,045	20,500	'	'
Accounts payable	106,768	74,178	'	'
Accrued liabilities	184,687	139,237	'	'
Total current liabilities	322,500	233,915	'	'
LONG-TERM DEBT	5,700,193	3,598,625	'	'
DEFERRED INCOME TAXES	384,301	356,896	'	'
OTHER NON-CURRENT LIABILITIES	78,266	51,347	'	'
Total liabilities	6,485,260	4,240,783	'	'
STOCKHOLDERS' EQUITY	-336,381	1,218,834	810,949	592,979
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	6,148,879	5,459,617	'	'
TransDigm Group	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'
Cash and cash equivalents	1,313	20,100	5,695	4,884
Total current assets	1,313	20,100	'	'
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	-360,694	1,198,734	'	'
TOTAL ASSETS	-359,381	1,218,834	'	'
STOCKHOLDERS' EQUITY	-359,381	1,218,834	'	'
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	-359,381	1,218,834	'	'
TransDigm Inc.	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'
Cash and cash equivalents	536,863	406,891	360,074	226,200
Trade accounts receivable-Net	16,332	12,261	'	'
Inventories-Net	26,353	23,410	'	'
Deferred income taxes	30,182	29,134	'	'
Prepaid expenses and other	7,533	9,585	'	'
Total current assets	617,263	481,281	'	'
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	5,206,201	4,720,602	'	'
PROPERTY, PLANT AND EQUIPMENT-Net	15,471	15,685	'	'
GOODWILL	67,245	85,680	'	'
TRADEMARKS AND TRADE NAMES	19,377	19,377	'	'
OTHER INTANGIBLE ASSETS-Net	22,130	8,151	'	'
DEBT ISSUE COSTS-Net	72,668	62,190	'	'
OTHER	2,633	2,750	'	'
TOTAL ASSETS	6,022,988	5,395,716	'	'
Current portion of long-term debt	31,045	20,500	'	'
Accounts payable	14,353	10,068	'	'
Accrued liabilities	80,313	68,808	'	'
Total current liabilities	125,711	99,376	'	'
LONG-TERM DEBT	5,700,193	3,598,625	'	'
DEFERRED INCOME TAXES	384,301	356,896	'	'
OTHER NON-CURRENT LIABILITIES	32,474	24,083	'	'
Total liabilities	6,242,679	4,078,980	'	'
STOCKHOLDERS' EQUITY	-219,691	1,316,736	'	'
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	6,022,988	5,395,716	'	'
Subsidiary Guarantors	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'
Cash and cash equivalents	7,900	4,494	2,115	3,028
Trade accounts receivable-Net	251,272	207,537	'	'
Inventories-Net	359,518	272,180	'	'
Prepaid expenses and other	10,693	12,626	'	'
Total current assets	629,383	496,837	'	'
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	2,527,374	2,055,938	'	'
PROPERTY, PLANT AND EQUIPMENT-Net	178,193	144,177	'	'
GOODWILL	3,192,519	2,872,483	'	'
TRADEMARKS AND TRADE NAMES	434,066	416,490	'	'
OTHER INTANGIBLE ASSETS-Net	663,881	614,225	'	'
OTHER	10,520	-27,249	'	'
TOTAL ASSETS	7,635,936	6,572,901	'	'
Accounts payable	82,661	54,054	'	'
Accrued liabilities	88,204	64,250	'	'
Total current liabilities	170,865	118,304	'	'
OTHER NON-CURRENT LIABILITIES	45,748	26,480	'	'
Total liabilities	216,613	144,784	'	'
STOCKHOLDERS' EQUITY	7,419,323	6,428,117	'	'
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	7,635,936	6,572,901	'	'
Non-Guarantor Subsidiaries	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'
Cash and cash equivalents	18,664	9,039	8,299	'
Trade accounts receivable-Net	24,567	17,486	'	'
Inventories-Net	28,633	25,397	'	'
Prepaid expenses and other	3,317	2,376	'	'
Total current assets	75,181	54,298	'	'
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	77,853	43,745	'	'
PROPERTY, PLANT AND EQUIPMENT-Net	15,300	12,875	'	'
GOODWILL	84,143	77,339	'	'
TRADEMARKS AND TRADE NAMES	32,247	31,747	'	'
OTHER INTANGIBLE ASSETS-Net	19,249	33,620	'	'
OTHER	201	39,546	'	'
TOTAL ASSETS	304,174	293,170	'	'
Accounts payable	11,481	11,553	'	'
Accrued liabilities	16,170	6,179	'	'
Total current liabilities	27,651	17,732	'	'
OTHER NON-CURRENT LIABILITIES	44	784	'	'
Total liabilities	27,695	18,516	'	'
STOCKHOLDERS' EQUITY	276,479	274,654	'	'
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	304,174	293,170	'	'
Eliminations	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'
Trade accounts receivable-Net	-1,722	-1,501	'	'
Inventories-Net	-923	-484	'	'
Total current assets	-2,645	-1,985	'	'
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	-7,450,734	-8,019,019	'	'
OTHER INTANGIBLE ASSETS-Net	-1,460	'	'	'
OTHER	1	'	'	'
TOTAL ASSETS	-7,454,838	-8,021,004	'	'
Accounts payable	-1,727	-1,497	'	'
Total current liabilities	-1,727	-1,497	'	'
Total liabilities	-1,727	-1,497	'	'
STOCKHOLDERS' EQUITY	-7,453,111	-8,019,507	'	'
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	($7,454,838)	($8,021,004)	'	'

Supplemental_Condensed_Consoli1

Supplemental Condensed Consolidating Statement of Income and Comprehensive Income (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Supplemental Guarantor Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
NET SALES	'	'	'	'	'	'	'	'	$1,924,400	$1,700,208	$1,206,021
COST OF SALES	'	'	'	'	'	'	'	'	874,838	754,491	544,836
Gross profit	'	'	'	'	'	'	'	'	1,049,562	945,717	661,185
SELLING AND ADMINISTRATIVE EXPENSES	'	'	'	'	'	'	'	'	254,468	201,709	133,711
AMORTIZATION OF INTANGIBLE ASSETS	'	'	'	'	'	'	'	'	45,639	44,233	40,339
INCOME (LOSS) FROM OPERATIONS	'	'	'	'	'	'	'	'	749,455	699,775	487,135
INTEREST EXPENSE-Net	'	'	'	'	'	'	'	'	270,685	211,906	185,256
REFINANCING COSTS	'	'	'	'	'	'	'	'	30,281	'	72,454
Income from continuing operations before income taxes	'	'	'	'	'	'	'	'	448,489	487,869	229,425
INCOME TAX PROVISION (BENEFIT)	'	'	'	'	'	'	'	'	145,700	162,900	77,200
INCOME (LOSS) FROM CONTINUING OPERATIONS	'	'	'	'	'	'	'	'	302,789	324,969	152,225
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX	'	'	'	'	'	'	'	'	'	'	19,909
NET INCOME	'	'	'	'	'	'	'	'	302,789	324,969	172,134
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	'	'	'	'	'	'	'	'	1,535	-4,774	523
TOTAL COMPREHENSIVE INCOME	'	'	'	'	'	'	'	'	304,324	320,195	172,657
TransDigm Group	'	'	'	'	'	'	'	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
NET SALES	539,737	488,636	465,609	430,418	462,606	461,660	423,469	352,473	'	'	'
Gross profit	282,719	268,986	259,310	238,547	256,820	253,302	236,040	199,555	'	'	'
EQUITY IN INCOME OF SUBSIDIARIES	'	'	'	'	'	'	'	'	-302,789	-324,969	-172,134
Income from continuing operations before income taxes	'	'	'	'	'	'	'	'	302,789	324,969	172,134
INCOME (LOSS) FROM CONTINUING OPERATIONS	'	'	'	'	'	'	'	'	'	'	172,134
NET INCOME	84,027	76,655	67,937	74,170	87,866	90,446	81,552	65,105	302,789	324,969	172,134
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	'	'	'	'	'	'	'	'	1,535	-4,774	523
TOTAL COMPREHENSIVE INCOME	'	'	'	'	'	'	'	'	304,324	320,195	172,657
TransDigm Inc.	'	'	'	'	'	'	'	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
NET SALES	'	'	'	'	'	'	'	'	110,608	103,694	81,944
COST OF SALES	'	'	'	'	'	'	'	'	66,524	64,394	46,438
Gross profit	'	'	'	'	'	'	'	'	44,084	39,300	35,506
SELLING AND ADMINISTRATIVE EXPENSES	'	'	'	'	'	'	'	'	88,286	61,214	44,754
AMORTIZATION OF INTANGIBLE ASSETS	'	'	'	'	'	'	'	'	624	624	624
INCOME (LOSS) FROM OPERATIONS	'	'	'	'	'	'	'	'	-44,826	-22,538	-9,872
INTEREST EXPENSE-Net	'	'	'	'	'	'	'	'	267,385	208,384	183,175
REFINANCING COSTS	'	'	'	'	'	'	'	'	30,281	'	72,454
EQUITY IN INCOME OF SUBSIDIARIES	'	'	'	'	'	'	'	'	-505,199	-465,683	-345,158
Income from continuing operations before income taxes	'	'	'	'	'	'	'	'	162,707	234,761	79,657
INCOME TAX PROVISION (BENEFIT)	'	'	'	'	'	'	'	'	-140,082	-90,208	-92,477
INCOME (LOSS) FROM CONTINUING OPERATIONS	'	'	'	'	'	'	'	'	'	'	172,134
NET INCOME	'	'	'	'	'	'	'	'	302,789	324,969	172,134
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	'	'	'	'	'	'	'	'	-4,515	-3,067	-1,194
TOTAL COMPREHENSIVE INCOME	'	'	'	'	'	'	'	'	298,274	321,902	170,940
Subsidiary Guarantors	'	'	'	'	'	'	'	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
NET SALES	'	'	'	'	'	'	'	'	1,699,742	1,508,067	1,097,662
COST OF SALES	'	'	'	'	'	'	'	'	732,812	622,056	479,536
Gross profit	'	'	'	'	'	'	'	'	966,930	886,011	618,126
SELLING AND ADMINISTRATIVE EXPENSES	'	'	'	'	'	'	'	'	147,620	125,261	85,796
AMORTIZATION OF INTANGIBLE ASSETS	'	'	'	'	'	'	'	'	43,265	41,937	37,900
INCOME (LOSS) FROM OPERATIONS	'	'	'	'	'	'	'	'	776,045	718,813	494,430
INTEREST EXPENSE-Net	'	'	'	'	'	'	'	'	2,028	2,268	777
Income from continuing operations before income taxes	'	'	'	'	'	'	'	'	774,017	716,545	493,653
INCOME TAX PROVISION (BENEFIT)	'	'	'	'	'	'	'	'	272,829	251,514	167,822
INCOME (LOSS) FROM CONTINUING OPERATIONS	'	'	'	'	'	'	'	'	'	'	325,831
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX	'	'	'	'	'	'	'	'	'	'	4,883
NET INCOME	'	'	'	'	'	'	'	'	501,188	465,031	330,714
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	'	'	'	'	'	'	'	'	950	204	-78
TOTAL COMPREHENSIVE INCOME	'	'	'	'	'	'	'	'	502,138	465,235	330,636
Non-Guarantor Subsidiaries	'	'	'	'	'	'	'	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
NET SALES	'	'	'	'	'	'	'	'	120,706	102,299	31,649
COST OF SALES	'	'	'	'	'	'	'	'	81,583	81,390	24,334
Gross profit	'	'	'	'	'	'	'	'	39,123	20,909	7,315
SELLING AND ADMINISTRATIVE EXPENSES	'	'	'	'	'	'	'	'	17,180	15,234	3,172
AMORTIZATION OF INTANGIBLE ASSETS	'	'	'	'	'	'	'	'	1,750	1,672	1,815
INCOME (LOSS) FROM OPERATIONS	'	'	'	'	'	'	'	'	20,193	4,003	2,328
INTEREST EXPENSE-Net	'	'	'	'	'	'	'	'	1,272	1,254	1,304
Income from continuing operations before income taxes	'	'	'	'	'	'	'	'	18,921	2,749	1,024
INCOME TAX PROVISION (BENEFIT)	'	'	'	'	'	'	'	'	12,953	1,594	1,855
INCOME (LOSS) FROM CONTINUING OPERATIONS	'	'	'	'	'	'	'	'	'	'	-831
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX	'	'	'	'	'	'	'	'	'	'	15,026
NET INCOME	'	'	'	'	'	'	'	'	5,968	1,155	14,195
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	'	'	'	'	'	'	'	'	5,100	-1,911	1,789
TOTAL COMPREHENSIVE INCOME	'	'	'	'	'	'	'	'	11,068	-756	15,984
Eliminations	'	'	'	'	'	'	'	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'	'	'	'	'	'	'	'
NET SALES	'	'	'	'	'	'	'	'	-6,656	-13,852	-5,234
COST OF SALES	'	'	'	'	'	'	'	'	-6,081	-13,349	-5,472
Gross profit	'	'	'	'	'	'	'	'	-575	-503	238
SELLING AND ADMINISTRATIVE EXPENSES	'	'	'	'	'	'	'	'	1,382	'	-11
INCOME (LOSS) FROM OPERATIONS	'	'	'	'	'	'	'	'	-1,957	-503	249
EQUITY IN INCOME OF SUBSIDIARIES	'	'	'	'	'	'	'	'	807,988	790,652	517,292
Income from continuing operations before income taxes	'	'	'	'	'	'	'	'	-809,945	-791,155	-517,043
INCOME (LOSS) FROM CONTINUING OPERATIONS	'	'	'	'	'	'	'	'	'	'	-517,043
NET INCOME	'	'	'	'	'	'	'	'	-809,945	-791,155	-517,043
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	'	'	'	'	'	'	'	'	-1,535	4,774	-523
TOTAL COMPREHENSIVE INCOME	'	'	'	'	'	'	'	'	($811,480)	($786,381)	($517,566)

Supplemental_Condensed_Consoli2

Supplemental Condensed Consolidating Statement of Cash Flows (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Supplemental Guarantor Information [Line Items]	'	'	'
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	$470,205	$413,885	$260,386
Capital expenditures	-35,535	-25,246	-18,026
Acquisition of businesses, net of cash acquired	-483,257	-868,696	-1,650,363
Cash proceeds from sale of investment	16,350	'	'
Cash proceeds from sales of discontinued operations	'	'	271,361
Cash proceeds from sale of business	'	17,650	'
Net cash used in investing activities	-502,442	-876,292	-1,397,028
Excess tax benefits related to share-based payment arrangements	66,201	50,555	23,411
Proceeds from exercise of stock options	21,534	15,710	9,208
Dividends paid	-1,991,350	-3,299	-2,811
Proceeds from 2013 credit facility-net	3,064,014	'	'
Treasury stock purchased	'	-846	'
Repayment on 2013 credit facility	-18,760	'	'
Proceeds from 2011 credit facility-net	147,360	484,316	1,500,048
Repayment on 2011 credit facility	-2,169,125	-19,250	-11,625
Proceeds from senior subordinated notes	'	'	1,582,184
Repurchase of senior subordinated notes due 2014	'	'	-1,041,894
Repayment on 2006 credit facility	'	'	-780,000
Net cash provided by (used in) financing activities	156,195	527,186	1,278,521
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	258	-438	192
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	124,216	64,341	142,071
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	440,524	376,183	234,112
CASH AND CASH EQUIVALENTS, END OF PERIOD	564,740	440,524	376,183
Business Acquisition	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Acquisition of businesses, net of cash acquired	-483,257	'	'
7 1/2% Senior Subordinated Notes, Due 2021	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Proceeds from senior subordinated notes	494,765	'	'
5 1/2% Senior Subordinated Notes, Due 2020	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Proceeds from senior subordinated notes	541,556	'	'
TransDigm Group	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Intercompany activities	1,884,828	-47,715	-28,997
Excess tax benefits related to share-based payment arrangements	66,201	50,555	23,411
Proceeds from exercise of stock options	21,534	15,710	9,208
Dividends paid	-1,991,350	-3,299	-2,811
Treasury stock purchased	'	-846	'
Net cash provided by (used in) financing activities	-18,787	14,405	811
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	-18,787	14,405	811
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	20,100	5,695	4,884
CASH AND CASH EQUIVALENTS, END OF PERIOD	1,313	20,100	5,695
TransDigm Inc.	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	-95,862	-119,491	-164,846
Capital expenditures	-2,047	-1,865	-2,639
Acquisition of businesses, net of cash acquired	'	-868,696	-1,650,363
Cash proceeds from sale of investment	16,350	'	'
Cash proceeds from sales of discontinued operations	'	'	271,361
Cash proceeds from sale of business	'	17,650	'
Net cash used in investing activities	-468,954	-852,911	-1,381,641
Intercompany activities	-1,365,022	554,153	431,648
Proceeds from 2013 credit facility-net	3,064,014	'	'
Repayment on 2013 credit facility	-18,760	'	'
Proceeds from 2011 credit facility-net	147,360	484,316	1,500,048
Repayment on 2011 credit facility	-2,169,125	-19,250	-11,625
Proceeds from senior subordinated notes	'	'	1,582,184
Repurchase of senior subordinated notes due 2014	'	'	-1,041,894
Repayment on 2006 credit facility	'	'	-780,000
Net cash provided by (used in) financing activities	694,788	1,019,219	1,680,361
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	129,972	46,817	133,874
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	406,891	360,074	226,200
CASH AND CASH EQUIVALENTS, END OF PERIOD	536,863	406,891	360,074
TransDigm Inc. \| Business Acquisition	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Acquisition of businesses, net of cash acquired	-483,257	'	'
TransDigm Inc. \| 7 1/2% Senior Subordinated Notes, Due 2021	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Proceeds from senior subordinated notes	494,765	'	'
TransDigm Inc. \| 5 1/2% Senior Subordinated Notes, Due 2020	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Proceeds from senior subordinated notes	541,556	'	'
Subsidiary Guarantors	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	565,957	523,759	409,483
Capital expenditures	-29,727	-22,259	-15,140
Net cash used in investing activities	-29,727	-22,259	-15,140
Intercompany activities	-532,824	-499,121	-395,256
Net cash provided by (used in) financing activities	-532,824	-499,121	-395,256
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	3,406	2,379	-913
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	4,494	2,115	3,028
CASH AND CASH EQUIVALENTS, END OF PERIOD	7,900	4,494	2,115
Non-Guarantor Subsidiaries	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	8,703	9,466	14,102
Capital expenditures	-3,761	-1,122	-247
Net cash used in investing activities	-3,761	-1,122	-247
Intercompany activities	4,425	-7,166	-5,748
Net cash provided by (used in) financing activities	4,425	-7,166	-5,748
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	258	-438	192
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	9,625	740	8,299
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	9,039	8,299	'
CASH AND CASH EQUIVALENTS, END OF PERIOD	18,664	9,039	8,299
Eliminations	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	-8,593	151	1,647
Intercompany activities	8,593	-151	-1,647
Net cash provided by (used in) financing activities	$8,593	($151)	($1,647)

Valuation_and_Qualifying_Accou1

Valuation and Qualifying Accounts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2011
Allowance for doubtful accounts	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Balance at the Beginning of Period	$4,960		$2,873		$2,270
Charged to Cost Expenses	1,566		1,555		570
Acquisition	1,137		1,066		599
Deductions from Reserve	-2,178	[1]	-534	[1]	-566	[1]
Balance at the End of Period	5,485		4,960		2,873
Reserve for excess and obsolete inventory	'		'		'
Valuation and Qualifying Accounts Disclosure [Line Items]	'		'		'
Balance at the Beginning of Period	36,081		25,623		18,251
Charged to Cost Expenses	14,159		11,839		8,361
Acquisition	148		4,933		415
Deductions from Reserve	-5,019	[1]	-6,314	[1]	-1,404	[1]
Balance at the End of Period	$45,369		$36,081		$25,623

[1]	The amounts in this column represent charge-offs net of recoveries.