Advanced Drainage Systems (WMS) 10-Q 10 Nov 14 2015 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2015	'
Document Fiscal Period Focus	'Q2	'
Trading Symbol	'WMS	'
Entity Registrant Name	'ADVANCED DRAINAGE SYSTEMS, INC.	'
Entity Central Index Key	'0001604028	'
Current Fiscal Year End Date	'--03-31	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	52,938,098

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Current assets:	'	'
Cash	$6,581	$3,931
Receivables (less allowance for doubtful accounts of $3,977 and $3,819, respectively)	248,120	150,713
Inventories	247,368	260,300
Deferred income taxes and other current assets	12,848	13,555
Total current assets	514,917	428,499
Property, plant and equipment, net	288,170	292,082
Other assets:	'	'
Goodwill	86,280	86,297
Intangible assets, net	60,266	66,184
Other assets	68,591	64,533
Total assets	1,018,224	937,595
Current liabilities:	'	'
Current maturities of debt obligations	11,148	11,153
Accounts payable	113,530	108,111
Other accrued liabilities	43,508	37,956
Accrued income taxes	22,360	7,372
Total current liabilities	190,546	164,592
Long-term debt obligation	386,435	442,895
Deferred tax liabilities	64,398	69,169
Other liabilities	14,263	15,324
Total liabilities	655,642	691,980
Commitments and contingencies (see Note 11)	'	'
Mezzanine equity:	'	'
Redeemable Common Stock; $0.01 par value: 38,320 and 0 issued and outstanding, respectively	'	549,119
Redeemable Convertible Preferred Stock; $0.01 par value: 47,070 authorized: 44,170 issued: 26,129 and 26,129 outstanding, respectively	326,623	291,720
Deferred compensation - unearned ESOP shares	-217,346	-197,888
Total mezzanine equity	109,277	642,951
Stockholders' equity:	'	'
Common stock; $0.01 par value: 148,271 and 1,000,000 authorized: 109,951 and 153,560 issued: 9,141 and 52,935 outstanding, respectively	12,393	11,957
Paid-in capital	675,183	22,547
Common stock in treasury, at cost	-447,674	-448,439
Accumulated other comprehensive loss	-8,483	-5,977
Retained earnings	'	'
Total ADS stockholders' equity	231,419	-419,912
Noncontrolling interest in subsidiaries	21,886	22,576
Total stockholders' equity	253,305	-397,336
Total liabilities, mezzanine equity and stockholders' equity	$1,018,224	$937,595

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Mar. 31, 2014
In Thousands, except Share data, unless otherwise specified
Allowance for doubtful accounts	$3,819	$3,977
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	1,000,000,000	148,271,000
Common stock, shares issued	153,560,000	109,951,000
Common stock, shares outstanding	52,935,000	9,141,000
Redeemable Common Stock [Member]	'	'
Mezzanine equity, par value	$0.01	$0.01
Mezzanine equity, shares issued	0	38,320,000
Mezzanine equity, shares outstanding	0	38,320,000
Redeemable Convertible Preferred Stock [Member]	'	'
Mezzanine equity, par value	$0.01	$0.01
Mezzanine equity, shares authorized	47,070,000	47,070,000
Mezzanine equity, shares issued	44,170,000	44,170,000
Mezzanine equity, shares outstanding	26,129,000	26,129,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]	'	'	'	'
Net sales	$364,724	$333,240	$693,021	$626,342
Cost of goods sold	282,282	260,021	538,546	487,120
Gross profit	82,442	73,219	154,475	139,222
Operating expenses:	'	'	'	'
Selling	19,762	18,166	39,008	35,843
General and administrative	18,879	17,917	39,411	35,576
Gain on sale of business	'	'	'	-4,848
Intangible amortization	2,638	2,861	5,279	5,722
Income from operations	41,163	34,275	70,777	66,929
Other expense:	'	'	'	'
Interest expense	4,338	3,866	8,953	7,967
Other miscellaneous expense (income), net	-7	287	7	816
Income before income taxes	36,832	30,122	61,817	58,146
Income tax expense	14,062	12,242	23,757	23,308
Equity in net loss of unconsolidated affiliates	2	97	623	345
Net income	22,768	17,783	37,437	34,493
Less net income attributable to noncontrolling interest	378	461	806	875
Net income attributable to ADS	22,390	17,322	36,631	33,618
Change in fair value of Redeemable Convertible Preferred Stock	7,319	-3,186	-11,054	-4,764
Dividends to Redeemable Convertible Preferred Stockholders	-37	-214	-75	-430
Dividends paid to unvested restricted stockholders	'	-8	'	-16
Net income available to common stockholders and participating securities	29,672	13,914	25,502	28,408
Undistributed income allocated to participating securities	-3,404	-1,536	-3,040	-3,124
Net income available to common stockholders	$26,268	$12,378	$22,462	$25,284
Weighted average common shares outstanding:	'	'	'	'
Basic	51,518	47,250	49,538	47,220
Diluted	56,463	47,579	52,198	47,634
Net income per share:	'	'	'	'
Basic	$0.51	$0.26	$0.45	$0.54
Diluted	$0.51	$0.26	$0.45	$0.53
Cash dividends declared per share	'	$0.03	'	$0.06

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$22,768	$17,783	$37,437	$34,493
Other comprehensive income (loss):	'	'	'	'
Currency translation, before tax	-4,608	1,164	-4,268	-3,974
Other, before tax	'	'	'	5
Total other comprehensive income (loss), before tax	-4,608	1,164	-4,268	-3,969
Tax attributes of items in other comprehensive income (loss):	'	'	'	'
Currency translation	1,038	246	850	918
Other	'	'	'	-2
Total tax expense	1,038	246	850	916
Comprehensive income	19,198	19,193	34,019	31,440
Less other comprehensive loss attributable to noncontrolling interest, net of tax	-759	-297	-912	-1,270
Less net income attributable to noncontrolling interest	378	461	806	875
Total comprehensive income attributable to ADS	$19,579	$19,029	$34,125	$31,835

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Statement of Cash Flows [Abstract]	'	'
Cash Flows from Operating Activities	$10,807	$3,283
Cash Flows from Investing Activities	'	'
Capital expenditures	-15,643	-21,700
Proceeds from sale of business	'	5,877
Investment in unconsolidated affiliate	-7,566	-5,300
Additions of capitalized software	-2,008	-1,380
Other investing activities	-525	-533
Net cash used in investing activities	-25,742	-23,036
Cash Flows from Financing Activities	'	'
Cash dividends paid	'	-3,079
Debt issuance costs	'	-2,311
Redemption of Redeemable Convertible Preferred Stock	'	-3,146
Proceeds from Senior Notes	'	25,000
Proceeds from term loan	'	100,000
Payments on term loan	-2,500	-77,500
Payments of notes, mortgages, and other debt	-1,665	-963
Proceeds from Revolving Credit Facility	174,760	225,400
Payments on Revolving Credit Facility	-227,000	-242,300
Proceeds from initial public offering of common stock, net of underwriter discounts and commissions	79,131	'
Payments for deferred initial public offering costs	-4,458	'
Other financing activities	-432	-673
Net cash provided by financing activities	17,836	20,428
Effect of exchange rate changes on cash and cash equivalents	-251	'
Net change in cash and equivalents	2,650	675
Cash and equivalents at beginning of period	3,931	1,361
Cash and equivalents at end of period	$6,581	$2,036

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Stockholders' Equity and Mezzanine Equity (USD $)

Total

Common Stock [Member]

Paid In Capital [Member]

Common Stock in Treasury [Member]

Accumulated Other Comprehensive Loss [Member]

Retained Earnings [Member]

Total Stock-holders' Equity [Member]

Non-controlling Interest in Subsidiaries [Member]

Deferred Compensation - Unearned ESOP Shares [Member]

Total Mezzanine Equity [Member]

Redeemable Common Stock [Member]

Redeemable Convertible Preferred Stock [Member]

In Thousands

Beginning Balance, Value at Mar. 31, 2013

($285,722)

$11,957

$41,152

($448,571)

($856)

$87,331

($308,987)

$23,265

($196,477)

$608,346

$522,276

$282,547

Beginning Balance, Shares at Mar. 31, 2013

'

109,979

'

101,191

'

'

'

'

18,461

'

38,292

26,547

Net income

34,493

'

'

'

'

33,618

33,618

875

'

'

'

'

Other comprehensive loss

-3,053

'

'

'

-1,783

'

-1,783

-1,270

'

'

'

'

Redeemable Convertible Preferred Stock dividends

-355

'

'

'

'

-355

-355

'

'

'

'

'

Common stock dividend ($0.058 per share)

-2,724

'

'

'

'

-2,724

-2,724

'

'

'

'

'

Dividend paid to noncontrolling interest holder

-490

'

'

'

'

'

'

-490

'

'

'

'

Allocation of ESOP shares to participants for compensation, Value

-1,023

'

-1,023

'

'

'

-1,023

'

6,049

6,049

'

'

Allocation of ESOP shares to participants for compensation, Shares

'

'

'

'

'

'

'

'

-537

'

'

'

Exercise of common stock options, Value

526

'

109

417

'

'

526

'

'

'

'

'

Exercise of common stock options, Shares

'

'

'

-94

'

'

'

'

'

'

'

'

Redemption of common shares to exercise stock options, Value

'

'

204

-204

'

'

'

'

'

'

'

'

Redemption of common shares to exercise stock options, Shares

'

'

'

14

'

'

'

'

'

'

'

'

Stock based compensation

246

'

246

'

'

'

246

'

'

'

'

'

Restricted stock awards, Value

1,178

'

850

328

'

'

1,178

'

'

'

'

'

Restricted stock awards, Shares

'

'

'

-104

'

'

'

'

'

'

'

'

Redemption of Redeemable Convertible Preferred Stock, Value

'

'

'

'

'

'

'

'

'

-3,146

'

-3,146

Redemption of Redeemable Convertible Preferred Stock, Shares

'

'

'

'

'

'

'

'

'

'

'

-297

Purchase of common stock

-171

'

'

-171

'

'

-171

'

'

'

'

'

Purchase of common stock, Shares

'

'

'

14

'

'

'

'

'

'

'

'

Reclassification of common stock to Redeemable Common Stock, Value

-385

'

-385

'

'

'

-385

'

'

385

385

'

Reclassification of common stock to Redeemable Common Stock, Shares

'

-28

'

'

'

'

'

'

'

'

28

'

Adjustments to Redeemable Common Stock fair value measurement

-4,764

'

'

'

'

-4,764

-4,764

'

-11,409

4,764

'

16,173

Adjustments to Redeemable Common Stock fair value measurement

-30,528

'

'

'

'

-30,528

-30,528

'

'

30,528

30,528

'

Ending Balance, Value at Sep. 30, 2013

-292,772

11,957

41,153

-448,201

-2,639

82,578

-315,152

22,380

-201,837

646,926

553,189

295,574

Ending Balance, Shares at Sep. 30, 2013

'

109,951

'

101,021

'

'

'

'

17,924

'

38,320

26,250

Beginning Balance, Value at Mar. 31, 2014

-397,336

11,957

22,547

-448,439

-5,977

'

-419,912

22,576

-197,888

642,951

549,119

291,720

Beginning Balance, Shares at Mar. 31, 2014

'

109,951

'

100,810

'

'

'

'

17,727

'

38,320

26,129

Net income

37,437

'

'

'

'

36,631

36,631

806

'

'

'

'

Other comprehensive loss

-3,418

'

'

'

-2,506

'

-2,506

-912

'

'

'

'

Dividend paid to noncontrolling interest holder

-584

'

'

'

'

'

'

-584

'

'

'

'

Allocation of ESOP shares to participants for compensation, Value

983

'

983

'

'

'

983

'

4,391

4,391

'

'

Allocation of ESOP shares to participants for compensation, Shares

'

'

'

'

'

'

'

'

-537

'

'

'

Exercise of common stock options, Value

523

'

174

349

'

'

523

'

'

'

'

'

Exercise of common stock options, Shares

'

'

'

-78

'

'

'

'

'

'

'

'

Redemption of common shares to exercise stock options, Value

'

'

93

-93

'

'

'

'

'

'

'

'

Redemption of common shares to exercise stock options, Shares

'

'

'

7

'

'

'

'

'

'

'

'

Stock based compensation

1,817

'

1,817

'

'

'

1,817

'

'

'

'

'

Restricted stock awards, Value

1,998

'

1,489

509

'

'

1,998

'

'

'

'

'

Restricted stock awards, Shares

'

'

'

-114

'

'

'

'

'

'

'

'

Initial Public Offering (IPO), Value

72,298

53

72,245

'

'

'

72,298

'

'

'

'

'

Initial Public Offering (IPO), Shares

'

5,289

'

'

'

'

'

'

'

'

'

'

Reclassification of liability classified stock options upon IPO

1,522

'

1,522

'

'

'

1,522

'

'

'

'

'

Adjustments to Redeemable Convertible Preferred Stock fair value measurement

-11,054

'

'

'

'

-11,054

-11,054

'

-23,849

11,054

'

34,903

Adjustments to Redeemable Common Stock fair value measurement

-65,921

'

-40,344

'

'

-25,577

-65,921

'

'

65,921

65,921

'

Termination of redemption feature upon IPO, Value

615,040

383

614,657

'

'

'

615,040

'

'

-615,040

-615,040

'

Termination of redemption feature upon IPO, Shares

'

38,320

'

'

'

'

'

'

'

'

-38,320

'

Ending Balance, Value at Sep. 30, 2014

$253,305

$12,393

$675,183

($447,674)

($8,483)

'

$231,419

$21,886

($217,346)

$109,277

'

$326,623

Ending Balance, Shares at Sep. 30, 2014

'

153,560

'

100,625

'

'

'

'

17,190

'

'

26,129

Condensed_Consolidated_Stateme4

Condensed Consolidated Statements of Stockholders' Equity and Mezzanine Equity (Parenthetical) (USD $)	6 Months Ended
	Sep. 30, 2013
Common stock dividend per share	$0.06
Total Mezzanine Equity [Member]	'
Common stock dividend per share	$0.06

Background_and_Summary_of_Sign

Background and Summary of Significant Accounting Policies	6 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Background and Summary of Significant Accounting Policies	'
	1	BACKGROUND AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Organization
	Advanced Drainage Systems, Inc. (collectively with its subsidiaries referred to as “ADS”, the “Company”, “we”, “us” and “our”), incorporated in Delaware, designs, manufactures and markets high performance thermoplastic corrugated pipe and related water management products, primarily in North and South America and Europe.
	The Company is managed based primarily on the geographies in which it operates and reports results of operations in two reportable segments. The reportable segments are Domestic and International.
	2014 Initial Public Offering (“IPO”)
	On July 11, 2014, in anticipation of the IPO, we executed a 4.707-for-one split of our common and our preferred stock. The effect of the stock split on outstanding shares and earnings per share has been retroactively applied to all periods presented.
	On July 30, 2014, we completed the IPO of our common stock, which resulted in the sale by the Company of 5,289 shares, bringing the total number of shares issued and outstanding as of July 30, 2014 to 52,881. We received total proceeds from the IPO of $79.1 million after excluding underwriter discounts and commissions of $5.5 million, based upon the price to the public of $16.00 per share. After deducting other offering expenses of approximately $6.8 million, we used the net proceeds of $72.3 million to reduce the outstanding indebtedness under the revolving portion of our credit facility. The common stock is listed on the New York Stock Exchange under the symbol “WMS.”
	On August 22, 2014, an additional 600 shares of common stock were sold by certain selling stockholders of the Company as a result of the partial exercise by the underwriters of the over-allotment option granted by the selling stockholders to the underwriters in connection with the IPO. The shares were sold at the public offering price of $16.00 per share. The Company did not receive any proceeds from the sale of such additional shares.
	Basis of Presentation
	The Company prepares its condensed consolidated financial statements in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The Condensed Consolidated Balance Sheet as of March 31, 2014 was derived from audited financial statements. In our opinion, the accompanying unaudited condensed consolidated financial statements contain all adjustments, of a normal recurring nature, necessary to present fairly its financial position as of September 30, 2014 and the results of operations for the second quarter and six months ended September 30, 2013 and 2014 and cash flows for the six months ended September 30, 2013 and 2014. The interim condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements, including the notes thereto filed in our Registration Statement filing on Form S-1 (File No. 333-194980), as amended, declared effective by the SEC on July 24, 2014.
	Principles of Consolidation
	Our condensed consolidated financial statements include the Company, our wholly-owned subsidiaries, our majority-owned subsidiaries and variable interest entities (“VIEs”) of which we are the primary beneficiary. We use the equity method of accounting for equity investments where we exercise significant influence but do not hold a controlling financial interest. Such investments are recorded in Other assets in our Condensed Consolidated Balance Sheets and the related equity earnings from these investments is included in Equity in net loss of unconsolidated affiliates in our Condensed Consolidated Statements of Income. All intercompany balances and transactions have been eliminated in consolidation.
	Estimates
	The preparation of our condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates include, but are not limited to, our allowance for doubtful accounts, useful lives of our property, plant and equipment and amortizing intangible assets, valuation allowance on deferred tax assets, reserves for uncertain tax positions, evaluation of goodwill, intangible assets and other long-lived assets for impairment, accounting for stock based compensation and our ESOP, reserves for general liability, workers’ compensation, and medical insurance, cash discounts and customer rebates and valuation of our Redeemable Common Stock and Redeemable Convertible Preferred Stock. Management’s estimates and assumptions are evaluated on an ongoing basis and are based on historical experience, current conditions and available information. Management believes the accounting estimates are appropriate and reasonably determined; however, due to the inherent uncertainties in making these estimates, actual results could differ from those estimates.
	Recent Accounting Pronouncements Not Yet Adopted
	In April 2014, the Financial Accounting Standards Board issued authoritative guidance amending existing requirements for reporting discontinued operations. Under the new guidance, discontinued operations reporting will be limited to disposal transactions that represent strategic shifts having a major effect on operations and financial results. The amended guidance also enhances disclosures and requires assets and liabilities of a discontinued operation to be classified as such for all periods presented in the financial statements. Public entities will apply the amended guidance prospectively to all disposals occurring within annual periods beginning on or after December 15, 2014, and interim periods within those years. We will adopt this standard effective April 1, 2015. We are currently evaluating the impact of this amendment on our consolidated financial statements.
	In May 2014, the Financial Accounting Standards Board issued an accounting standards update which amends the guidance for revenue recognition. This amendment contains principals that will require an entity to recognize revenue to depict the transfer of goods and services to customers at an amount that an entity expects to be entitled to in exchange for goods or services. The amendment sets forth a new revenue recognition model that requires identifying the contract, identifying the performance obligations and recognizing the revenue upon satisfaction of performance obligations. This amendment is effective for annual periods beginning on or after December 15, 2016, and interim periods within those years, with earlier adoption not permitted. We will adopt this standard effective April 1, 2017. We are currently evaluating the impact of this amendment on our consolidated financial statements.
	In August 2014, the Financial Accounting Standards Board issued an accounting standards update which provides guidance for management’s assessment of an entity’s ability to continue as a going concern. The new guidance is intended to define management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related footnote disclosures. The guidance provides a definition of the term substantial doubt and requires an assessment for a period of one year after the date that the financial statements are issued (or available to be issued). It also requires certain disclosures when substantial doubt is alleviated as a result of the consideration of management’s plans and requires an express statement and other disclosures when substantial doubt is not alleviated. The new standard will be effective for annual periods beginning on or after December 15, 2016, and interim periods within those years, with earlier adoption permitted. We will adopt this standard effective April 1, 2017. We are currently evaluating the impact of this new standard on our consolidated financial statements.

Sale_of_Business

Sale of Business	6 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Sale of Business	'
	2	SALE OF BUSINESS
	On June 28, 2013, we entered into an Asset Purchase Agreement (the “NDS Agreement”) to sell substantially all of the assets used in connection with our DrainTech product line to National Diversified Sales, Inc. (“NDS”) in exchange for cash. The NDS Agreement defined the purchase price to consist of a cash payment of $5,877. The net book value for the related assets, consisting of inventory and property and equipment, was $1,029, bringing the net gain recognized to $4,848. The sale transaction closed on June 28, 2013. The Company determined that this sale did not qualify for discontinued operations reporting.

Property_Plant_and_Equipment_N

Property, Plant and Equipment - Net	6 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment - Net	'
	3	PROPERTY, PLANT AND EQUIPMENT – NET
	Property, plant and equipment—net as of March 31, 2014 and September 30, 2014 consisted of the following:
	(Amounts in thousands)		March 31,			September 30,
			2014			2014
	Land, buildings and improvements		$	151,088		$	154,709
	Machinery and equipment			532,468			542,029
	Total cost			683,556			696,738
	Less accumulated depreciation			(391,474	)		(408,568	)
	Property, plant and equipment – net		$	292,082		$	288,170
	The following table sets forth depreciation expense for the three and six months ended September 30, 2013 and 2014, respectively:
			Three Months Ended						Six Months Ended
			September 30,						September 30,
	(Amounts in thousands)		2013			2014			2013		2014
	Depreciation expense		$	9,196			9,239		$	18,606		18,399

Inventories

Inventories	6 Months Ended
	Sep. 30, 2014
Inventory Disclosure [Abstract]	'
Inventories	'
	4	INVENTORIES
	Inventories as of March 31, 2014 and September 30, 2014 consisted of the following:
	(Amounts in thousands)		March 31,		September 30,
			2014		2014
	Raw materials		$	52,267	$	58,673
	Finished goods			208,033	$	188,695
	Total inventory		$	260,300	$	247,368
	We had no work-in-process inventories as of March 31, 2014 and September 30, 2014.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	6 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	5	GOODWILL AND INTANGIBLE ASSETS
	Goodwill
	The carrying amount of goodwill by reportable segment is as follows:
	(Amounts in thousands)		Domestic		International			Total
	Balance at March 31, 2014		$	85,702	$	595		$	86,297
	Currency translation			—		(17	)		(17	)
	Balance at September 30, 2014		$	85,702	$	578		$	86,280
	Intangible Assets
	Intangible assets as of March 31, 2014 and September 30, 2014 consisted of the following:
			March 31, 2014								September 30, 2014
	(Amounts in thousands)		Gross		Accumulated			Net			Gross		Accumulated			Net
			Intangible		Amortization			Intangible			Intangible		Amortization			Intangible
	Definite-lived intangible assets
	Developed technology			40,579		(22,588	)		17,991			40,579		(24,497	)		16,082
	Customer lists			39,252		(22,079	)		17,173			39,252		(24,530	)		14,722
	Patents			6,175		(2,921	)		3,254			6,338		(3,235	)		3,103
	Contract agreements			11,493		(4,280	)		7,213			11,493		(5,256	)		6,237
	Trademarks			12,857		(4,294	)		8,563			12,857		(4,723	)		8,134
	Total definite-lived intangible assets			110,356		(56,162	)		54,194			110,519		(62,241	)		48,278
	Indefinite-lived intangible assets
	Trademarks			11,990		—			11,990			11,988		—			11,988
	Total intangible assets			122,346		(56,162	)		66,184			122,507		(62,241	)		60,266
	The following table sets forth amortization expense for the three and six months ended September 30, 2013 and 2014, respectively:
			Three Months Ended					Six Months Ended
			September 30,					September 30,
	(Amounts in thousands)		2013		2014			2013			2014
	Amortization expense		$	4,691	$	4,544		$	9,382		$	9,087

Fair_Value_Measurement

Fair Value Measurement	6 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurement	'
	6	FAIR VALUE MEASUREMENT
	The fair value measurements and disclosure principles of ASC 820 - Fair Value Measurements and Disclosures define fair value, establish a framework for measuring fair value and provide disclosure requirements about fair value measurements. These principles define a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:
	Level 1 — Quoted prices (unadjusted) in active markets for identical assets or liabilities that the entity has the ability to access as of the measurement date.
	Level 2 — Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.
	Level 3 — Significant unobservable inputs that reflect a reporting entity’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.
	When applying fair value principles in the valuation of assets and liabilities, we are required to maximize the use of quoted market prices and minimize the use of unobservable inputs. The Company has not changed its valuation techniques used in measuring the fair value of any financial assets or liabilities during the periods presented. Our fair value estimates take into consideration the credit risk of both the Company and our counterparties.
	When active market quotes are not available for financial assets and liabilities, we use industry standard valuation models. Where applicable, these models project future cash flows and discount the future amounts to a present value using market-based observable inputs including credit risk, interest rate curves, foreign currency rates and forward and spot prices for currencies. In circumstances where market-based observable inputs are not available, management judgment is used to develop assumptions to estimate fair value. Generally, the fair value of our Level 3 instruments is estimated as the net present value of expected future cash flows based on internal and external inputs.
	Recurring Fair Value Measurements
	The assets and liabilities carried at fair value as of March 31, 2014 and September 30, 2014 were as follows:
			March 31, 2014
	(Amounts in thousands)		Total			Level 1			Level 2			Level 3
	Assets:
	Derivative assets – diesel fuel contracts		$	27		$	—		$	27		$	—
	Total assets at fair value on a recurring basis		$	27		$	—		$	27		$	—
	Liabilities & Mezzanine Equity:
	Derivative liability – interest rate swaps		$	1,001		$	—		$	1,001		$	—
	Contingent consideration for acquisitions			2,276			—			—			2,276
	Redeemable Common Stock			549,119			—			—			549,119
	Redeemable Convertible Preferred Stock			291,720			—			—			291,720
	Deferred compensation – unearned ESOP shares			(197,888	)		—			—			(197,888	)
	Total liabilities & mezzanine equity at fair value on a recurring basis		$	646,228		$	—		$	1,001		$	645,227
			September 30, 2014
	(Amounts in thousands)		Total			Level 1			Level 2			Level 3
	Liabilities:
	Derivative liability – interest rate swaps		$	639		$	—		$	639		$	—
	Derivative liability – diesel fuel contracts			8			—			8			—
	Derivative liability – propylene swaps			491			—			491			—
	Contingent consideration for acquisitions			2,276			—			—			2,276
	Total liabilities at fair value on a recurring basis		$	3,414		$	—		$	1,138		$	2,276
	Changes in the fair value of recurring fair value measurements using significant unobservable inputs (Level 3) for the three and six months ended September 30, 2013 and 2014 were as follows:
			Three Months Ended						Six Months Ended
			September 30,						September 30,
	(Amounts in thousands)		2013			2014			2013			2014
	Balance at beginning of period		$	624,889		$	777,499		$	610,881		$	645,227
	Allocation of ESOP shares to participants			3,122			804			6,049			4,391
	Change in fair value related to items recorded in mezzanine equity			23,539			(51,710	)		35,292			76,975
	Reclassification of common stock to Redeemable Common Stock			—			—			385			—
	Redemption of Redeemable Convertible Preferred Stock			(2,089	)		—			(3,146	)		—
	Termination of redemption feature on redeemable common stock upon IPO			—			(615,040	)		—			(615,040	)
	(1)    Change in redemption feature of Redeemable Convertible Preferred Stock			—			(326,623	)		—			(326,623	)
	(2)    Change in redemption feature of Deferred Compensation – unearned ESOP Shares			—			217,346			—			217,346
	Balance at end of period		$	649,461		$	2,276		$	649,461		$	2,276
	For the six months ended September 30, 2014 our Redeemable Common Stock transferred out of Level 3, as these securities started actively trading on the NYSE during the second quarter of fiscal 2015. In addition, our Redeemable Convertible Preferred Stock and Deferred Compensation – unearned ESOP were reclassified from a recurring Level 3 fair value measurement to a non-recurring Level 3 fair value measurement as a result of the IPO. See Note 1 for further information on the IPO. There were no further transfers in or out of Levels 1, 2 and 3 for the fiscal year ended March 31, 2014 and the six months ended September 30, 2014.
	Valuation of our Contingent Consideration for Acquisitions
	The fair values of the contingent consideration payables were calculated with reference to the estimated future value of the Inserta Tee and Flexstorm businesses, which are based on a discounted cash flow model. The undiscounted value is discounted at the present value using a market discount rate. The categorization of the framework used to price this liability is considered a Level 3, due to the subjective nature of the unobservable inputs used to determine the fair value.
	Valuation of our Redeemable Common Stock
	The Company has certain shares of common stock outstanding allowing the holder to put its shares to us for cash. This Redeemable Common Stock was historically recorded at its fair value in the mezzanine equity section of our Condensed Consolidated Balance Sheets and changes in fair value were recorded in Retained earnings. Historically, the fair value of a share of common stock was determined by management by applying industry-appropriate multiples to EBITDA and performing a discounted cash flow analysis. Under the industry-appropriate multiples approach, to arrive at concluded multiples, we considered differences between the risk and return characteristics of ADS and the guideline companies. Under the discounted cash flow analysis, the cash flows expected to be generated by the Company are discounted to their present value equivalent using a rate of return that reflects the relative risk of an investment in ADS, as well as the time value of money. This return is an overall rate based upon the individual rates of return for invested capital (equity and interest-bearing debt). The return, known as the weighted average cost of capital (“WACC”), is calculated by weighting the required returns on interest-bearing debt and common stock in proportion to their estimated percentages in an expected capital structure. The WACC used was 11% as of March 31, 2014. An increase in the WACC would decrease the fair value of the Redeemable Common Stock. The categorization of the framework used to price this temporary equity is considered a Level 3, due to the subjective nature of the unobservable inputs used to determine the fair value.
	The redemption feature of our Redeemable Common Stock allowing the holder to put its shares to us for cash, as discussed in the previous paragraph, was terminated upon effectiveness of the IPO on July 25, 2014. As a result, the Redeemable Common Stock was recorded at fair value through the effective date of the IPO and was subsequently reclassified at that fair value to permanent equity. See Note 1 for more information on the IPO.
	Valuation of our Redeemable Convertible Preferred Stock
	The Trustee of the Company’s ESOP has the ability to put the shares of our Redeemable Convertible Preferred Stock to the Company. Our Redeemable Convertible Preferred Stock is recorded at its fair value in the mezzanine equity section of our Condensed Consolidated Balance Sheets and changes in fair value are recorded in Retained earnings. Accordingly, we estimated the fair value of the Redeemable Convertible Preferred Stock through estimating the fair value of the Company’s common stock and applying certain adjustments including for the fair value of the total dividends to be received and assuming conversion of the Redeemable Convertible Preferred Stock to common stock at the stated conversion ratio per our Certificate of Incorporation. The categorization of the framework used to price this temporary equity is considered a Level 3, due to the subjective nature of the unobservable inputs used to determine the fair value.
	Upon the effective date of the IPO, the redemption feature of our Redeemable Convertible Preferred Stock allowing the Trustee of the Company’s ESOP to put shares to us for cash was no longer applicable. However, if our common stock, which our Redeemable Convertible Preferred Stock may convert to, is no longer a “registration-type class of security” (e.g., in the event of a delisting), the option held by the Trustee, which granted it the ability to put the shares of our Redeemable Convertible Preferred Stock to us, would then become applicable. Preferred securities that become redeemable upon a contingent event that is not solely within the control of the Company should be classified outside of permanent equity. As of September 30, 2014, the Company has determined that it is not probable that the redemption feature will become applicable. Since the Redeemable Convertible Preferred Stock is not currently redeemable and it is not probable that the instrument will become redeemable, subsequent adjustment to fair value is not required. As such, the Redeemable Convertible Preferred Stock was recorded to fair value at the effective date of the IPO on July 25, 2014 and will remain in mezzanine equity without further adjustment to carrying value unless it becomes probable that the redemption feature will become applicable. See Note 1 for more information on the 2014 Initial Public Offering and Note 13 for further information on the Redeemable Convertible Preferred Stock.
	Nonrecurring Fair Value Measurements
	Goodwill and indefinite lived intangible assets are tested for impairment annually as of March 31 or whenever events or changes in circumstances indicate the carrying value may be greater than fair value.

Variable_Interest_Entities

Variable Interest Entities	6 Months Ended
	Sep. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]	'
Variable Interest Entities	'
	7	VARIABLE INTEREST ENTITIES
	The accounting model for VIEs described in ASC 810-10 considers if a company has a controlling financial interest in a VIE. A controlling financial interest will have both (a) the power to direct the activities of a VIE that most significantly impact the VIE’s economic performance and (b) the obligation to absorb losses of a VIE that could potentially be significant to the VIE or the right to receive benefits from the VIE that could be potentially significant to the VIE. Entities are required to consolidate a VIE when it is determined that they have a controlling financial interest in a VIE and therefore, are the primary beneficiary of that VIE. In determining whether we are the primary beneficiary of a VIE, we consider factors such as voting rights including kick-out rights, whether we have the power to direct the VIE’s significant activities, variable interests held by related parties and other factors. We believe that significant assumptions and judgments were applied consistently.
	We participate in joint ventures from time to time for the purpose of expanding upon our growth of manufacturing and selling HDPE corrugated pipe in emerging markets. Our investments in these joint ventures may create a variable interest in a VIE, depending upon the contractual terms of the arrangement. One of our joint ventures, ADS Mexicana, was determined to be a VIE. In April 2013, ADS Worldwide acquired an additional 1% equity interest in its consolidated subsidiary ADS Mexicana stock for $520, increasing the Company’s ownership percentage to 51% from 50%. We invest in this VIE for the purpose of expanding upon our growth of manufacturing and selling ADS licensed HDPE corrugated pipe and related products in the Mexican and Central American markets via the joint venture partner’s local presence and expertise throughout the region. We have executed a Technology, Patents and Trademarks Sub-License Agreement and a Distribution Agreement with ADS Mexicana that provides ADS Mexicana with the rights to manufacture and sell ADS licensed products in Mexico and Central America. We are the guarantor of 100% of ADS Mexicana’s credit facility and our maximum potential payment under this guarantee totals $12,000. We have concluded that we hold a variable interest in and are the primary beneficiary of ADS Mexicana based on our power to direct the most significant activities of ADS Mexicana and our obligation to absorb losses and our right to receive benefits that could be significant to ADS Mexicana. As the primary beneficiary, we are required to consolidate the assets and liabilities of ADS Mexicana. The equity owned by our joint venture partner is shown as Noncontrolling interest in subsidiaries in our Condensed Consolidated Balance Sheets and our joint venture partner’s portion of net income is shown as Net income attributable to noncontrolling interest in our Condensed Consolidated Statements of Income.
	The table below includes the assets and liabilities of ADS Mexicana that are consolidated as of March 31, 2014 and September 30, 2014. The balances exclude intercompany transactions that are eliminated upon consolidation.
	(Amounts in thousands)		March 31,		September 30,
			2014		2014
	Assets
	Current assets		$	35,272	$	36,435
	Property, plant and equipment, net			21,633		20,542
	Other noncurrent assets			2,698		2,333
	Total assets		$	59,603	$	59,310
			March 31,		September 30,
			2014		2014
	Liabilities
	Current liabilities		$	9,090	$	8,514
	Noncurrent liabilities			1,240		3,267
	Total liabilities		$	10,330	$	11,781

Investment_in_Unconsolidated_A

Investment in Unconsolidated Affiliates	6 Months Ended
	Sep. 30, 2014
Investments in and Advances to Affiliates, Schedule of Investments [Abstract]	'
Investment in Unconsolidated Affiliates	'
	8	INVESTMENT IN UNCONSOLIDATED AFFILIATES
	We participate in three unconsolidated joint ventures, Tuberias Tigre — ADS Limitada (“Tigre ADS”), which is 50%-owned by our wholly-owned subsidiary ADS Chile, BaySaver Technologies, LLC (“BaySaver”), which is 55% owned by our wholly-owned subsidiary ADS Ventures, Inc, and Tigre-ADS USA, Inc. (“Tigre-ADS USA”), which is 49% owned by our wholly-owned subsidiary ADS Ventures, Inc.
	Tigre ADS
	Our investment in this unconsolidated joint venture was formed for the purpose of expanding upon our growth of manufacturing and selling HDPE corrugated pipe in the South American market via the joint venture partner’s local presence and expertise throughout the region. We are the guarantor of 50% of Tigre ADS’ credit facility, and the debt guarantee is shared equally with the joint venture partner. Our maximum potential payment under this guarantee totals $7,000. We are not required to consolidate Tigre ADS under ASC 810-10 as we are not the primary beneficiary, although we do hold a significant variable interest in Tigre ADS through our equity investment and debt guarantee. The results of Tigre ADS are accounted for in the condensed consolidated financial statements using the equity method of accounting. Our share of the loss of this joint venture is reported in the Condensed Consolidated Statements of Income under Equity in net loss of unconsolidated affiliates. Our investment in this joint venture is included in Other assets in the Condensed Consolidated Balance Sheets.
	Summarized financial data as of the fiscal year ended March 31, 2014 and September 30, 2014 for the Tigre ADS joint venture is as follows:
			March 31, 2014				September 30, 2014
	(Amounts in thousands)		As reported		Maximum		As reported		Maximum
			on Balance		Exposure		on Balance		Exposure
			Sheet				Sheet
	Investment in Tigre ADS		$	22,029	$	22,029	$	21,490	$	21,490
	Receivable from Tigre ADS			8,899		8,899		5,234		5,234
	ADS’ Guarantee of Tigre ADS Debt			—		7,000		—		7,000
	BaySaver
	On July 15, 2013, ADS Ventures, Inc., a wholly-owned subsidiary of the Company, BaySaver Technologies, Inc. (“BTI”) and Mid Atlantic Storm Water Research Center, Inc. entered into an LLC agreement to form a new joint venture, BaySaver. The joint venture was established to design, engineer, manufacture, market and sell water quality filters and separators used in the removal of sediment and pollution from storm water anywhere in the world except New Zealand, Australia and South Africa. The Company contributed $3,500 in cash, $1,285 in inventory, and other intangible assets with no carrying value, in exchange for a 55% equity interest and a 50% voting interest in BaySaver. We are not required to consolidate BaySaver under ASC 810-10 as we are not the primary beneficiary, although we do hold a significant variable interest in BaySaver through our equity investment. The Company accounts for its investment in BaySaver under the equity method of accounting. In connection with this investment, the Company acquired a call option to purchase the remaining 45% interest in BaySaver. Also, in connection with the investment, the Company granted a put option enabling the other equity holders to sell their remaining shares in BaySaver to the Company upon the passage of time or the occurrence of certain events. Our share of the income of this joint venture is reported in the Condensed Consolidated Statements of Income under Equity in net loss of unconsolidated affiliates. Our investment in this joint venture is included in Other assets in the Condensed Consolidated Balance Sheets.
	Summarized financial data as of fiscal year ended March 31, 2104 and September 30, 2014 for the BaySaver joint venture is as follows:
			March 31, 2014				September 30, 2014
	(Amounts in thousands)		As reported		Maximum		As reported		Maximum
			on Balance		Exposure		on Balance		Exposure
			Sheet				Sheet
	Investment in Baysaver		$	5,202	$	5,202	$	5,217	$	5,217
	Receivable from Baysaver			6		6		216		216
	Our share of the income of this joint venture is decreased by amortization expense relating to the basis difference between our cost basis in the investment and the basis reflected at the joint venture level. This basis difference is being recorded over the lives of the underlying assets which gave rise to the basis difference, which is 10 years. The unrecorded basis difference as of September 30, 2014 is $1,739.
	Tigre-ADS USA
	On April 7, 2014, ADS Ventures, Inc., a wholly-owned subsidiary of the Company, and Tigre S.A. – Tubos e Conexoes entered into a stock purchase agreement to form a new joint venture, Tigre-ADS USA Inc. The new joint venture was established to manufacture and sell PVC fittings for waterworks, plumbing, and HVAC applications primarily in the United States and Canadian markets. The Company acquired 49% of the outstanding shares of capital stock of Tigre USA, Inc. for $3,566. The new joint venture represents a continuation of the existing activities of Tigre USA through its Janesville, Wisconsin manufacturing facility. We are not required to consolidate Tigre-ADS USA under ASC 810-10 as we are not the primary beneficiary, although we do hold a significant variable interest in Tigre-ADS USA through our equity investment. The Company accounts for its investment in Tigre-ADS USA under the equity method of accounting. Our share of the loss of this joint venture is reported in the Condensed Consolidated Statements of Income under Equity in net loss of unconsolidated affiliates. Our investment in this joint venture is included in Other assets in the Condensed Consolidated Balance Sheets.
	Summarized financial data as of September 30, 2014 for the Tigre-ADS USA joint venture is as follows:
	(Amounts in thousands)		As reported		Maximum
			on Balance		Exposure
			Sheet
	Investment in Tigre-ADS USA		$	3,406	$	3,406
	Receivable from Tigre-ADS USA			25		25

Debt

Debt	6 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Debt	'
	9	DEBT
	Long-term debt as of March 31, 2014 and September 30, 2014 consisted of the following:
			March 31,			September 30,
			2014			2014
	a. Bank term loans:
	Revolving Credit Facility – ADS		$	248,100		$	193,800
	Revolving Credit Facility – ADS Mexicana			—			2,000
	Term note			97,500			95,000
	b. Senior Notes payable			100,000			100,000
	c. Mortgage notes payable			3,733			2,833
	d. Industrial revenue bonds			4,715			3,950
	Total			454,048			397,583
	Current maturities			(11,153	)		(11,148	)
	Long-term debt obligation		$	442,895		$	386,435
		a.	Revolving Credit Facility:
	The current ADS Revolving Credit Agreement (the “Revolving Credit Facility”) has been in place with several banks and was refinanced on June 12, 2013. The current bank credit facility expires in June 2018. Additionally, on December 20, 2013, we amended the private shelf agreement primarily to make certain amendments in order to permit the payment of a special dividend of $1.59 per share which was financed in full through the Revolving Credit Facility.
	The Revolving Credit Facility agreement increased the upper limit of the Revolving Credit Facility to $325,000 for ADS and $12,000 for ADS Mexicana. The Company also entered into a five-year $100,000 term note. Both the Revolving Credit Facility and the term note share the same interest rate structure.
	The Revolving Credit Facility interest rate is variable and depends upon the Company’s “pricing ratio” as defined in the agreement. The interest rate is derived from the London InterBank Offered Rate (LIBOR) or alternate base rate (Prime Rate) based upon the Company’s option. The average rate at September 30, 2014 was 2.603%. Any letters of credit outstanding reduce the availability on the revolver. The Company had outstanding letters of credit at September 30, 2014 in the amount of $8,005. The amount available for borrowing for ADS was $123,195, plus $10,000 available under a separate revolving credit facility with our subsidiary, ADS Mexicana, at September 30, 2014.
	Per terms of the Revolving Credit Facility, ADS is not required to hedge its interest exposure using interest rate swaps; however, it is currently the objective of ADS to manage its exposure to variable rate debt. On October 7, 2010, ADS executed two Spot Interest Rate Swaps on the 90-Day LIBOR interest rate. One hedge is related to the $100,000 Term Debt which was part of the previous credit agreement. This fixed rate swap exchanges a fixed rate of 1.105% for a period of four years and expired on September 1, 2014. The second hedge on the Revolving Credit Facility executed on October 7, 2010 was for $50,000 for a period of three years at a fixed rate of 0.890% and expired on September 1, 2013.
	On July 18, 2013, ADS executed two Forward Interest Rate Swaps on the 30-Day LIBOR interest rate. One swap was for $50,000 on the Revolving Credit Facility starting on September 3, 2013 at a fixed rate of 0.86% for a period of three years, expiring on September 1, 2016. The second swap executed on July 18, 2013 was for $50,000 on the Revolving Credit Facility starting on September 2, 2014 at a fixed rate of 1.08% for a period of two years, expiring on September 1, 2016.
		b.	Senior Notes payable:
	In December 2009, ADS signed an agreement with Prudential Investment Management, Inc., for the issuance of senior promissory notes (“Senior Notes”), for an aggregate amount of up to $100,000. We may make requests for purchases of the Senior Notes during the “Issuance Period,” defined as a three-year period beginning with the date of the agreement. The minimum purchase amount of Senior Notes is $10,000. Each Senior Note issued has a maximum term of no more than 10 years from the date of issuance. Interest is payable quarterly and is fixed at 5.6%. The rate is subject to an additional 200 basis point excess leverage fee if calculated leverage exceeds 3 to 1. A principal payment of $25,000 is due in September in each of fiscal years 2017, 2018, and 2019.
	In July 2013, ADS issued an additional $25,000 of senior promissory notes (“Senior Notes”) with Prudential Investment Management, Inc. Interest is payable quarterly and is fixed at 4.05%. The rate is subject to an additional 200 basis point excess leverage fee if calculated leverage exceeds 3 to 1. A principal payment of $25,000 is due in September of the fiscal year 2020.
	The carrying and fair values of the Company’s Senior Notes were $100,000 and $103,583, respectively, as of September 30, 2014. The fair value of the Senior Notes was determined based on the interest rate and terms of such borrowings to the rates and terms of similar debt available for the period.
		c.	Mortgage notes payable:
	One mortgage note payable with a fixed rate of 5.1% (Hilliard, Ohio) requires monthly installments through fiscal year 2015. In September 2014, a second mortgage with a variable interest rate was paid off (New Miami, Ohio). Land and buildings with a net book value of approximately $4,971 at September 30, 2014 collateralize the mortgage note.
		d.	Industrial revenue bonds:
	ADS issued industrial revenue bonds for the construction of four production facilities. The original bond values of $27,300 require periodic principal and interest payments through fiscal year 2019. During fiscal year 2011, two of the four bonds were retired, and during July of fiscal year 2015, one more of the bonds was retired. This leaves a remaining principal of $3,950 at September 30, 2014. The interest rate on the remaining bond is variable and computed on a weekly basis. This bond is not considered auction rate securities. The rate on this bond at September 30, 2014, was 3.84%, including a letter of credit fee of 3.75%. Land and buildings with a net book value of approximately $10,116 at September 30, 2014 collateralize the remaining bond.
	The Revolving Credit Facility and the Senior Notes require, among other provisions, that we (1) maintain a minimum fixed charge ratio; (2) maintain a minimum leverage ratio; and (3) establish certain limits on permitted transactions, principally for indebtedness, capital distributions, loans and investments, and acquisitions and dispositions of assets. Capital distributions are limited to $50 million in any fiscal year if the pro-forma leverage ratio exceeds 3.0 to 1.

Derivative_Transactions

Derivative Transactions	6 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Transactions	'
	10	DERIVATIVE TRANSACTIONS
	The Company uses interest rate swaps, commodity options in the form of collars and swaps, and foreign currency forward contracts to manage its various exposures to interest rate, commodity price, and exchange rate fluctuations. For interest rate swaps, the difference between the spot rate and applicable base rate is recorded in interest expense. For collars, commodity swaps and forward contracts, contract settlement gains and losses are recorded in the Condensed Consolidated Statements of Income in Cost of goods sold. Gains and (losses) related to the mark-to-market adjustments for changes in fair value of the derivative contracts are recorded in the Condensed Consolidated Statements of Income as Other miscellaneous expense (income), net. The Company recognized (losses) on mark-to-market adjustments for changes in fair value on derivative contracts of $(319) and $(67) for the three months ended September 30, 2013 and 2014, respectively, and $(238) and $(163) for the six months ended September 30, 2013 and 2014, respectively.
	A summary of the fair values for the various derivatives at March 31, 2014 and September 30, 2014 is presented below:
			March 31, 2014					September 30, 2014
	(Amounts in thousands)		Asset		(Liability)			Asset		(Liability)
	Interest rate swaps		$	—	$	(1,001	)	$	—	$	(639	)
	Diesel fuel option collars			—		—			—		(8	)
	Propylene swaps			27					—		(491	)

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	11	COMMITMENTS AND CONTINGENCIES
	Leases
	We lease real estate, transportation, and office equipment under various noncancelable operating lease agreements that expire at various dates through fiscal year 2037.
	Total rent expense was $6,049 and $4,554 for the three months ended September 30, 2013 and 2014, respectively, and $11,607 and $10,342 for the six months ended September 30, 2013 and 2014, respectively.
	Purchase Commitments
	At September 30, 2014, commitments for the purchase of major property, plant, and equipment totaled approximately $11,379.
	We will, from time to time, secure supplies of resin raw material by agreeing to purchase quantities during a future given period at a fixed price. These purchase contracts are short term in nature and occur in the ordinary course of business. Under such purchase contracts, we have agreed to purchase 30,000 pounds of resin over the period October 2014 through December 2014 at a committed purchase cost of $20,153.
	Litigation
	We have been named as a defendant in various litigation matters. Management intends to defend these outstanding claims. We believe we have adequate accrued loss contingencies and that current or threatened litigation matters will not have a material adverse impact on our condensed consolidated results of operations or condensed consolidated financial condition. Management estimates the maximum loss contingency is $420 and $364 at March 31, 2014 and September 30, 2014, respectively.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	6 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Accumulated Other Comprehensive Loss	'
	12	ACCUMULATED OTHER COMPREHENSIVE LOSS
	The following table presents the changes in balances of each component of Accumulated other comprehensive loss (“AOCI”) for the periods ending September 30:
	(Amounts in thousands)		Currency			Other			Accumulated Other
			Translation						Comprehensive
									Loss
	Balance at April 1, 2013		$	(860	)	$	4		$	(856	)
	Other comprehensive loss before reclassifications			(2,704	)		5			(2,699	)
	Amounts reclassified from AOCI			—			—			—
	Income tax expense (benefit)			918			(2	)		916
	Balance at September 30, 2013		$	(2,646	)	$	7		$	(2,639	)
	Balance at April 1, 2014			(5,985	)		8			(5,977	)
	Other comprehensive loss before reclassifications			(3,356	)		—			(3,356	)
	Amounts reclassified from AOCI			—			—			—
	Income tax expense			850			—			850
	Balance at September 30, 2014		$	(8,491	)	$	8		$	(8,483	)

Redeemable_Convertible_Preferr

Redeemable Convertible Preferred Stock (Redeemable Convertible Preferred Stock [Member])	6 Months Ended
	Sep. 30, 2014
Redeemable Convertible Preferred Stock [Member]	'
Redeemable Convertible Preferred Stock	'
	13	REDEEMABLE CONVERTIBLE PREFERRED STOCK
	The Trustee of the Company’s ESOP has the ability to put the shares of our Redeemable Convertible Preferred Stock to the Company. The redeemable convertible preferred stock has a required cumulative 2.5% dividend and is convertible to common stock at a rate of one share for every 0.7692 share of common stock. We guarantee the value of the redeemable convertible preferred stock at $0.78 per share. The put option requirements of the Internal Revenue Code apply in the event that the Company’s common stock is not a registration type class of security. Therefore, the holders of convertible preferred stock have a put right to require us to repurchase such shares in the event that our common stock is not listed for trading or otherwise quoted on the NYSE, AMEX, NASDAQ, or any other market more senior than the OTC Bulletin Board.
	Given that the event may trigger redemption of the convertible preferred stock (the listing or quotation on a market more senior than the OTCBB), is not solely within our control, this results in the classification of our convertible preferred stock recorded in the mezzanine section of our Condensed Consolidated Balance Sheets as of September 30, 2014.
	In accordance with ASC 480-10-S99, as of September 30, 2014, we did not adjust the carrying value of the convertible preferred stock to its redemption value or recognize any changes in fair value as we did not consider it probable that the convertible preferred stock would become redeemable.

Stock_Compensation

Stock Compensation	6 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock Compensation	'
	14	STOCK COMPENSATION
	Deferred Compensation — Unearned ESOP Shares
	The fair value of Redeemable Convertible Preferred Stock held by the ESOP trust, but not yet earned by the ESOP participants or used for dividends, is reported as Deferred compensation — unearned ESOP shares within the mezzanine equity section of our Condensed Consolidated Balance Sheets.
	Compensation expense and related dividends paid with ESOP shares are recognized based upon the average annual fair value of the shares allocated. The shares allocated are for services rendered throughout the period and, therefore, a simple average is used to calculate average annual fair value. Deferred compensation – unearned ESOP shares are relieved at the fair value, with any difference between the average fair value and the fair value shares when allocated being added to Additional paid in capital. The fair value of the shares allocated was $11.26 and $12.50 per share of Redeemable Convertible Preferred Stock at September 30, 2013 and 2014, respectively, resulting in an average fair value per share of $10.92 and $12.34 for the six months ended September 30, 2013 and 2014, respectively. We recognized compensation expense of $2,506 and $2,687 for the three months ended September 30, 2013 and 2014, respectively, and $5,026 and $5,374 for the six months ended September 30, 2013 and 2014, respectively, related to allocation of ESOP shares to participants for compensation.
	Stock Options
	Our 2000 stock option plan (“2000 Plan”) provides for the issuance of incentive common stock options and nonstatutory common stock options to management based upon the discretion of the Board of Directors. The plan generally provides for grants with the exercise price equal to fair value on the date of grant, which vest in three equal annual amounts beginning in year five and expire after 10 years from issuance.
	In August 2013, a new stock option plan (“2013 Plan”) was approved by the Board of Directors and, as amended, provides for the issuance of up to 500 nonstatutory common stock options to management subject to the Board’s discretion. The plan generally provides for grants with the exercise price equal to fair value on the date of grant. The grants vest in five equal annual amounts beginning in year one and expire after 10 years from issuance. Options issued to the Chief Executive Officer vest equally over four years and expire after 10 years from issuance.
	For both stock option plans, management determines the fair value of the options based on the Black-Scholes option pricing model. This methodology requires significant inputs including the fair value of our common stock, which is determined with the assistance of an independent appraisal performed by a reputable valuation firm. We recognized total stock-based compensation expense under both plans of $171 and $1,042 for the three months ended September 30, 2013 and 2014, respectively, and $246 and $2,418 for the six months ended September 30, 2013 and 2014, respectively, which was included with General and administrative expenses in our Condensed Consolidated Statements of Income. As of September 30, 2013 and 2014, there was a total of $9,319 and $5,307, respectively, of unrecognized compensation expense related to unvested stock option awards that will be recognized as an expense as the awards vest over the remaining service period. We had approximately 1,097 and 1,412 shares available for granting under the 2000 and 2013 plans, respectively, as of September 30, 2014.
	We estimate the fair value of stock options granted after April 1, 2006, using a Black-Scholes option-pricing model, with assumptions as follows:
			September 30,
			2013			2014
	Expected stock price volatility			44	%		40	%
	Risk-free interest rate			2.3			2.1
	Weighted-average expected option life (years)			8			8
	Dividend yield			0.84			0.86
	In May 2014, the Board of Directors approved the increase of shares available for granting under the 2013 plan to 1,412 shares.
	2000 Plan
	The stock option transactions as of the six months ended September 30 are summarized as follows:
			2013								2014
			Number			Weighted			Weighted		Number		Weighted		Weighted
			of Shares			Average			Average		of Shares		Average		Average
						Exercise			Remaining				Exercise		Remaining
						Price			Contractual				Price		Contractual
									Term						Term
	Outstanding at beginning of period			1,323			8.1			4		913		9.48		4.1
	Issued			15			13.64					78		15.74
	Exercised			94			7.77					78		7.36
	Forfeited			17			10.77					—		—
	Outstanding at end of period			1,227			8.19			3.7		913		10.2		4.3
	Exercisable and vested at end of period			836			6.8			2.1		835		9.67		3.8
	Unvested at end of period			391			11.16			7.1		78		15.74		9.9
	Vested and expected to vest at end of period			1,167			8.03			3.5		901		10.12		7.7
	As a result of the 2014 Initial Public Offering (See Note 1), all unvested stock options from prior issuances immediately vest. A new grant of 78 shares was issued in August 2014 at a fair market value of $15.74 per share. Vesting on this issuance will be recognized as expense as the awards vest over the remaining service period.
	The following table summarizes information about the nonvested stock option grants as of the six months ended September 30, 2014:
			Number			Weighted
			of Shares			Average Grant
						Date Fair Value
	Unvested at beginning of period			428		$	5.82
	Granted			78			6.76
	Vested			428			5.82
	Forfeited			—			—
	Unvested at end of period			78		$	6.76
	2013 Plan
	The stock option transactions as of the six months ended September 30, 2014 for the 2013 Stock Option Plan are summarized as follows:
			Number of			Weighted Average			Weighted Average
			Shares			Exercise Price			Remaining
									Contractual Term
	Outstanding at beginning of period			1,911		$	13.64			9.42
	Issued—equity classified			—			—			—
	Issued—liability classified			—			—			—
	Exercised			—			—			—
	Forfeited—equity classified			—			—			—
	Outstanding at end of period			1,911			13.64			8.92
	Exercisable and vested at end of period			408			13.64			8.92
	Unvested at end of period			1,503			13.64			8.92
	Vested and expected to vest at end of period			1,881			13.64			8.92
	Fair value of options granted during the period			—
	The following table summarizes information about the nonvested stock option grants as of September 30, 2014:
			Number			Weighted
			of Shares			Average Grant
						Date Fair Value
	Unvested at beginning of period			1,911		$	6.22
	Granted			—			—
Vested			408			13.64
Forfeited			—			—
Unvested at end of period			1,503		$	3.64
Restricted Stock
On September 16, 2008, the Board of Directors adopted the restricted stock plan for which restricted stock awards may be granted to certain key employees. The restricted stock will vest ratably over a five-year period from the original restricted stock grant date with the risk of forfeiture being stipulated only by the employees’ continuous employment by ADS. A portion of the grants vested immediately. Under the restricted stock plan, the vested shares granted are considered issued and outstanding. Employees with restricted stock have the right to dividends on the shares awarded (vested and unvested) in addition to voting rights on nonforfeited shares. The Company recognized compensation expense of $593 and $639 for the three months ended September 30, 2013 and 2014, respectively, and $1,178 and $1,548 for the six months ended September 30, 2013 and 2014, respectively, relating to the issuance of these shares; of this amount, $385 and $0 relates to the restricted shares that vested immediately during the six months ended September 30, 2013 and 2014, respectively. We had approximately 333 shares available for granting under this plan as of September 30, 2014.
The following table summarizes information about the unvested restricted stock grants as of September 30, 2014:
		Number			Weighted
		of			Average
		Shares			Grant Date
					Fair Value
Unvested at beginning of period			311		$	12.4
Granted			—			—
Vested			118			12.06
Forfeited			3			10.66
Unvested at end of period			190		$	12.6
We expect most, if not all, restricted stock grants to vest.
As of September 30, 2014, there was approximately $2,306 of unrecognized compensation expense related to the restricted stock that will be recognized over the remaining service period.
Non-Employee Director Compensation Plan
On June 18, 2014, the Company amended its then-existing Stockholder’s Agreement to authorize shares of stock to be granted to non-employee members of its Board of Directors. The number of shares authorized amounted to 282. The shares typically vest one year from the date of issuance. Under this stock plan, the vested shares granted are considered issued and outstanding. Non-Employee directors with this stock have the right to dividends on the shares awarded (vested and unvested) in addition to voting rights. On September 6, 2014, a total of 48 shares were granted to seven directors at a fair market value of $18.88 per share. These shares will vest on February 27, 2015. The Company recognized compensation expense of $0 and $450 for the three months ended September 30, 2013 and 2014, respectively, and $0 and $450 for the six months ended September 30, 2013 and 2014, respectively, relating to the issuance of these shares. We had approximately 234 shares available for granting under this plan as of September 30, 2014.
The following table summarizes information about the unvested Non-Employee Director Compensation stock grants as of September 30, 2014:
		Number			Weighted
		of			Average Grant
		Shares			Date Fair Value
Unvested at beginning of period			—		$	—
Granted			48			18.88
Vested			—			—
Forfeited			—			—
Unvested at end of period			48		$	—
We expect all the stock grants to vest.
As of September 30, 2014, there was approximately $450 of unrecognized compensation expense related to the restricted stock that will be recognized over the remaining service period.

Income_Taxes

Income Taxes	6 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	15	INCOME TAXES
	For the six months ended September 30, 2013 and 2014, the Company utilized an effective tax rate of 40.1% and 38.4%, respectively, to calculate its provision for income taxes. These rates are higher than the federal statutory rate of 35% due principally to state and local taxes, partially offset by foreign income taxed at lower rates. In accordance with ASC 740-270, “Income Taxes – Interim Reporting,” the Company’s expected annual effective tax rate for fiscal year 2015 based on all known variables is 38.4%.

Net_Income_Per_Share

Net Income Per Share	6 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Net Income Per Share	'
	16	NET INCOME PER SHARE
	Basic net income per share is calculated by dividing the Net income attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration for common stock equivalents. Diluted net income per share is computed by dividing the Net income attributable to common stockholders by the weighted-average number of common share equivalents outstanding for the period.
	Holders of unvested restricted stock have nonforfeitable rights to dividends when declared on common stock, and holders of Redeemable Convertible Preferred Stock participate in dividends on an as-converted basis when declared on common stock. As a result, unvested restricted stock and Redeemable Convertible Preferred Stock meet the definition of participating securities, which requires us to apply the two-class method to compute both basic and diluted net income per share. The two-class method is an earnings allocation formula that treats participating securities as having rights to earnings that would otherwise have been available to common stockholders.
	The dilutive effect of stock options and unvested restricted stock is based on the more dilutive of the treasury stock method or the diluted two-class method. In computing diluted net income per share, income available to common shareholders used in the basic net income per share calculation (numerator) is adjusted, subject to sequencing rules, for certain adjustments that would result from the assumed issuance of potential common shares. Diluted net income per share assumes the Redeemable Convertible Preferred Stock would be cash settled through the effective date of the IPO on July 25, 2014, as we have the choice of settling in cash or shares and we have demonstrated past practice and intent of cash settlement. Therefore these shares are excluded from the calculation through the effective date of the IPO. After the effective date of the IPO, Management’s intent is to share settle; therefore, these shares are included in the calculation from July 26, 2014 through September 30, 2014, if dilutive. For purposes of the calculation of diluted net income per share, stock options and unvested restricted stock are considered to be potential common stock and are only included in the calculations when their effect is dilutive.
	The Company’s Redeemable Common Stock is included in the weighted-average number of common shares outstanding for calculating basic and diluted net income per share.
	The following table presents information necessary to calculate net income per share for the three and six months ended September 30, 2013 and 2014, as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive:
			Three Months Ended						Six Months Ended
			September 30,						September 30,
	(Amounts in thousands, except per share data)		2013			2014			2013			2014
	NET INCOME PER SHARE—BASIC:
	Net income attributable to ADS		$	17,322		$	22,390		$	33,618		$	36,631
	Adjustment for:
	Change in fair value of Redeemable Convertible Preferred Stock			(3,186	)		7,319			(4,764	)		(11,054	)
	Dividends to Redeemable Convertible Preferred Stockholders			(214	)		(37	)		(430	)		(75	)
	Dividends paid to unvested restricted stockholders			(8	)		—			(16	)		—
	Net income available to common stockholders and participating securities			13,914			29,672			28,408			25,502
	Undistributed income allocated to participating securities			(1,536	)		(3,404	)		(3,124	)		(3,040	)
	Net income available to common stockholders – Basic			12,378			26,268			25,284			22,462
	Weighted average number of common shares outstanding – Basic			47,250			51,518			47,220			49,538
	Net income per common share – Basic		$	0.26		$	0.51		$	0.54		$	0.45
	NET INCOME PER SHARE—DILUTED:
	Net income available to common stockholders – Basic		$	12,378		$	26,268		$	25,284		$	22,462
	Undistributed income allocated to participating securities			—			2,401			—			1,073
	Net income available to common stockholders – Diluted			12,378			28,669			25,284			23,535
	Weighted average number of common shares outstanding – Basic			47,250			51,518			47,220			49,538
	Assumed conversion of preferred stock			—			4,714			—			2,382
	Assumed exercise of stock options			329			231			414			278
	Weighted average number of common shares outstanding – Diluted			47,579			56,463			47,634			52,198
	Net income per common share – Diluted		$	0.26		$	0.51		$	0.53		$	0.45
	Potentially dilutive securities excluded as anti-dilutive			38			22			63			57

Business_Segments_Information

Business Segments Information	6 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Business Segments Information	'
	17	BUSINESS SEGMENTS INFORMATION
	We operate our business in two distinct operating and reportable segments based on the markets we serve: “Domestic” and “International”. The Chief Operating Decision Maker (“CODM”) evaluates segment reporting based on net sales and Segment EBITDA and Segment Adjusted EBITDA (a non-GAAP measure). We calculate Segment EBITDA as net income or loss before interest, income taxes, depreciation and amortization. We calculate Segment Adjusted EBITDA as Segment EBITDA before non-cash stock-based compensation expense, non-cash charges and certain other expenses.
	Domestic - Our Domestic segment manufactures and markets products throughout the United States. We maintain and serve these markets through strong product distribution relationships with many of the largest national and independent waterworks distributors, major national retailers as well as an extensive network of hundreds of small to medium-sized distributors across the U.S. We also sell through a broad variety of buying groups and co-ops in the United States. Products include Singlewall pipe, N-12 HDPE pipe sold into the Storm sewer and Infrastructure markets, N-12 High Performance PP pipe sold into the Storm sewer and sanitary sewer markets, and our broad line of Allied Products including Stormtech, Nyloplast, Arc Septic Chambers, Inserta Tee, Baysaver filters and water quality structures, Fittings, and FleXstorm. Our Domestic segment sales are diversified across all regions of the country.
	International – Our International segment manufactures and markets products in regions outside of the United States, with a growth strategy focused on our owned facilities in Canada and through our joint-ventures, with best-in-class local partners in Mexico, Central America and South America. Our joint venture strategy provides us with local and regional access to new markets such as Brazil, Chile, Argentina, Peru and Colombia. We have been serving the Canadian market through Hancor of Canada since 2003. Our Mexican joint venture through ADS Mexicana primarily serves the Mexican markets, while our joint venture through Tigre ADS is our primary channel to serve the South American markets. Our product line includes Singlewall pipe, N-12 HDPE pipe, and N-12 High Performance PP pipe. The Canadian market also sells our broad line of Allied Products, while sales in Latin America are currently concentrated in fittings and Nyloplast.
	The following table sets forth reportable segment information with respect to the amount of net sales contributed by each class of similar products of our consolidated gross profit for the three and six months ended September 30, 2013 and 2014, respectively:
			Three Months Ended						Six Months Ended
			September 30,						September 30,
	(Amounts in thousands)		2013			2014			2013			2014
	Domestic
	Pipe			224,064			241,872			413,206			459,179
	Allied Products			72,008			77,770			138,455			151,945
	Total Domestic		$	296,072		$	319,642		$	551,661		$	611,124
	International
	Pipe			30,062			36,422			59,649			66,359
	Allied Products			7,106			8,660			15,032			15,538
	Total International		$	37,168		$	45,082			74,681			81,897
	Total net sales		$	333,240		$	364,724		$	626,342		$	693,021
	The following sets forth certain additional financial information attributable to our reportable segments for the three and six months ended September 30, 2013, and 2014, respectively:
			Three Months Ended						Six Months Ended
			September 30,						September 30,
	(Amounts in thousands)		2013			2014			2013			2014
	Net sales
	Domestic			296,072			319,642			551,661			611,124
	International			37,168			45,082			74,681			81,897
	Total		$	333,240		$	364,724		$	626,342		$	693,021
	Gross profit
	Domestic			65,278			74,572			122,830			139,362
	International			7,941			7,870			16,392			15,113
	Total		$	73,219		$	82,442		$	139,222		$	154,475
	Segment Adjusted EBITDA
	Domestic			46,802			56,124			91,880			101,893
	International			4,765			4,334			9,229			7,770
	Total		$	51,567		$	60,458		$	101,109		$	109,663
	Interest expense, net
	Domestic			3,844			4,325			7,933			8,938
	International			22			13			34			15
	Total		$	3,866		$	4,338		$	7,967		$	8,953
	Capital expenditures
	Domestic			7,065			7,898			18,003			14,835
	International			1,493			295			3,697			808
	Total		$	8,558		$	8,193		$	21,700		$	15,643
	Depreciation and amortization
	Domestic			12,701			12,486			25,569			24,952
	International			1,186			1,297			2,419			2,534
	Total		$	13,887		$	13,783		$	27,988		$	27,486
	Equity in net income (loss) of unconsolidated affiliates
	Domestic			114			251			114			404
	International			(211	)		(253	)		(459	)		(1,027	)
	Total		$	(97	)	$	(2	)	$	(345	)	$	(623	)
	The following sets forth certain additional financial information attributable to our reporting segments as of March 31, 2014 and September 30, 2014, respectively
			March 31,			September 30,
			2014			2014
	Investment in unconsolidated affiliates
	Domestic		$	5,202		$	8,623
	International			20,029			21,490
	Total		$	25,231		$	30,113
	Total identifiable assets
	Domestic		$	835,736		$	908,041
	International			115,167			125,641
	Eliminations			(13,308	)		(15,458	)
	Total		$	937,595		$	1,018,224
	Reconciliation of Segment EBITDA and Segment Adjusted EBITDA to Net Income
			Three Months Ended September 30,
		2013						2014
(Amounts in thousands)		Domestic			International			Domestic			International
Reconciliation of Segment EBITDA and Segment Adjusted EBITDA to Net Income:
Net income attributable to ADS		$	15,218		$	2,104		$	20,612		$	1,778
Depreciation and amortization (a)			12,702			1,519			12,724			1,705
Interest expense, net			3,844			22			4,325			13
Income tax expense			11,449			793			13,525			537
Segment EBITDA			43,213			4,438			51,186			4,033
Derivative fair value adjustments			319			—			67			—
Foreign currency transaction losses			—			(181	)		—			(205	)
Unconsolidated affiliates interest and tax			—			98			53			183
Management fee to minority interest holder JV			—			410			—			323
Share-based compensation			764			—			2,131			—
ESOP deferred compensation			2,506			—			2,687			—
Transaction costs (b)			—			—			—			—
Segment Adjusted EBITDA		$	46,802		$	4,765		$	56,124		$	4,334
	(a)	Includes our proportionate share of depreciation and amortization expense of $334 and $646 related to our Tigre ADS joint venture, BaySaver joint venture and Tigre-ADS USA joint venture, which is included in Equity in net loss of unconsolidated affiliates in our Condensed Consolidated Statements of Income for the three months ended September 30, 2013 and 2014, respectively.
	(b)	Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with our debt refinancing and completion of the IPO.
Reconciliation of Segment EBITDA and Segment Adjusted EBITDA to Net Income
		Six Months Ended September 30,
		2013						2014
(Amounts in thousands)		Domestic			International			Domestic			International
Reconciliation of Segment EBITDA and Segment Adjusted EBITDA to Net Income:
Net income attributable to ADS		$	29,675		$	3,943		$	34,054		$	2,577
Depreciation and amortization (a)			25,571			3,094			25,398			3,360
Interest expense, net			7,933			34			8,938			15
Income tax expense			21,895			1,413			22,741			1,016
Segment EBITDA			85,074			8,484			91,131			6,968
Derivative fair value adjustments			238			—			163			—
Foreign currency transaction losses			—			(87	)		—			(75	)
Unconsolidated affiliates interest and tax			—			228			94			319
Management fee to minority interest holder JV			—			604			—			558
Share-based compensation			1,424			—			4,416			—
ESOP deferred compensation			5,026			—			5,374			—
Transaction costs (b)			118			—			715			—
Segment Adjusted EBITDA		$	91,880		$	9,229		$	101,893		$	7,770
	(a)	Includes our proportionate share of depreciation and amortization expense of $677 and $1,272 related to our Tigre ADS joint venture, BaySaver joint venture and Tigre-ADS USA joint venture, which is included in Equity in net loss of unconsolidated affiliates in our Condensed Consolidated Statements of Income for the six months ended September 30, 2013 and 2014, respectively.
	(b)	Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with our debt refinancing and completion of the IPO.

Subsequent_Events

Subsequent Events	6 Months Ended
	Sep. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	18	SUBSEQUENT EVENTS
	We evaluated subsequent events through November 7, 2014, the date these condensed consolidated financial statements were available to be issued.

Background_and_Summary_of_Sign1

Background and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	The Company prepares its condensed consolidated financial statements in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The Condensed Consolidated Balance Sheet as of March 31, 2014 was derived from audited financial statements. In our opinion, the accompanying unaudited condensed consolidated financial statements contain all adjustments, of a normal recurring nature, necessary to present fairly its financial position as of September 30, 2014 and the results of operations for the second quarter and six months ended September 30, 2013 and 2014 and cash flows for the six months ended September 30, 2013 and 2014. The interim condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements, including the notes thereto filed in our Registration Statement filing on Form S-1 (File No. 333-194980), as amended, declared effective by the SEC on July 24, 2014.
Principles of Consolidation	'
	Principles of Consolidation
	Our condensed consolidated financial statements include the Company, our wholly-owned subsidiaries, our majority-owned subsidiaries and variable interest entities (“VIEs”) of which we are the primary beneficiary. We use the equity method of accounting for equity investments where we exercise significant influence but do not hold a controlling financial interest. Such investments are recorded in Other assets in our Condensed Consolidated Balance Sheets and the related equity earnings from these investments is included in Equity in net loss of unconsolidated affiliates in our Condensed Consolidated Statements of Income. All intercompany balances and transactions have been eliminated in consolidation.
Estimates	'
	Estimates
	The preparation of our condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Significant estimates include, but are not limited to, our allowance for doubtful accounts, useful lives of our property, plant and equipment and amortizing intangible assets, valuation allowance on deferred tax assets, reserves for uncertain tax positions, evaluation of goodwill, intangible assets and other long-lived assets for impairment, accounting for stock based compensation and our ESOP, reserves for general liability, workers’ compensation, and medical insurance, cash discounts and customer rebates and valuation of our Redeemable Common Stock and Redeemable Convertible Preferred Stock. Management’s estimates and assumptions are evaluated on an ongoing basis and are based on historical experience, current conditions and available information. Management believes the accounting estimates are appropriate and reasonably determined; however, due to the inherent uncertainties in making these estimates, actual results could differ from those estimates.

Property_Plant_and_Equipment_N1

Property, Plant and Equipment - Net (Tables)	6 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Schedule of Property, Plant, Equipment	'
	Property, plant and equipment—net as of March 31, 2014 and September 30, 2014 consisted of the following:
	(Amounts in thousands)	March 31,			September 30,
		2014			2014
	Land, buildings and improvements	$	151,088		$	154,709
	Machinery and equipment		532,468			542,029
	Total cost		683,556			696,738
	Less accumulated depreciation		(391,474	)		(408,568	)
	Property, plant and equipment – net	$	292,082		$	288,170
Depreciation Expense on Property, Plant and Equipment	'
	The following table sets forth depreciation expense for the three and six months ended September 30, 2013 and 2014, respectively:
		Three Months Ended						Six Months Ended
		September 30,						September 30,
	(Amounts in thousands)	2013			2014			2013		2014
	Depreciation expense	$	9,196			9,239		$	18,606		18,399

Inventories_Tables

Inventories (Tables)	6 Months Ended
	Sep. 30, 2014
Inventory Disclosure [Abstract]	'
Schedule of Inventories	'
	Inventories as of March 31, 2014 and September 30, 2014 consisted of the following:
	(Amounts in thousands)	March 31,		September 30,
		2014		2014
	Raw materials	$	52,267	$	58,673
	Finished goods		208,033	$	188,695
	Total inventory	$	260,300	$	247,368

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Carrying Amount of Goodwill by Reportable Segment	'
	The carrying amount of goodwill by reportable segment is as follows:
	(Amounts in thousands)	Domestic		International			Total
	Balance at March 31, 2014	$	85,702	$	595		$	86,297
	Currency translation		—		(17	)		(17	)
	Balance at September 30, 2014	$	85,702	$	578		$	86,280
Summary of Intangible Assets	'
	Intangible assets as of March 31, 2014 and September 30, 2014 consisted of the following:
		March 31, 2014								September 30, 2014
	(Amounts in thousands)	Gross		Accumulated			Net			Gross		Accumulated			Net
		Intangible		Amortization			Intangible			Intangible		Amortization			Intangible
	Definite-lived intangible assets
	Developed technology		40,579		(22,588	)		17,991			40,579		(24,497	)		16,082
	Customer lists		39,252		(22,079	)		17,173			39,252		(24,530	)		14,722
	Patents		6,175		(2,921	)		3,254			6,338		(3,235	)		3,103
	Contract agreements		11,493		(4,280	)		7,213			11,493		(5,256	)		6,237
	Trademarks		12,857		(4,294	)		8,563			12,857		(4,723	)		8,134
	Total definite-lived intangible assets		110,356		(56,162	)		54,194			110,519		(62,241	)		48,278
	Indefinite-lived intangible assets
	Trademarks		11,990		—			11,990			11,988		—			11,988
	Total intangible assets		122,346		(56,162	)		66,184			122,507		(62,241	)		60,266
Summary of Amortization Expense	'
	The following table sets forth amortization expense for the three and six months ended September 30, 2013 and 2014, respectively:
		Three Months Ended					Six Months Ended
		September 30,					September 30,
	(Amounts in thousands)	2013		2014			2013			2014
	Amortization expense	$	4,691	$	4,544		$	9,382		$	9,087

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	6 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Summary of Assets and Liabilities Carried at Fair Value	'
	The assets and liabilities carried at fair value as of March 31, 2014 and September 30, 2014 were as follows:
		March 31, 2014
	(Amounts in thousands)	Total			Level 1			Level 2			Level 3
	Assets:
	Derivative assets – diesel fuel contracts	$	27		$	—		$	27		$	—
	Total assets at fair value on a recurring basis	$	27		$	—		$	27		$	—
	Liabilities & Mezzanine Equity:
	Derivative liability – interest rate swaps	$	1,001		$	—		$	1,001		$	—
	Contingent consideration for acquisitions		2,276			—			—			2,276
	Redeemable Common Stock		549,119			—			—			549,119
	Redeemable Convertible Preferred Stock		291,720			—			—			291,720
	Deferred compensation – unearned ESOP shares		(197,888	)		—			—			(197,888	)
	Total liabilities & mezzanine equity at fair value on a recurring basis	$	646,228		$	—		$	1,001		$	645,227
		September 30, 2014
	(Amounts in thousands)	Total			Level 1			Level 2			Level 3
	Liabilities:
	Derivative liability – interest rate swaps	$	639		$	—		$	639		$	—
	Derivative liability – diesel fuel contracts		8			—			8			—
	Derivative liability – propylene swaps		491			—			491			—
	Contingent consideration for acquisitions		2,276			—			—			2,276
	Total liabilities at fair value on a recurring basis	$	3,414		$	—		$	1,138		$	2,276
Summary of Changes in Fair Value of Recurring Fair Value Measurements Using Unobservable Inputs	'
	Changes in the fair value of recurring fair value measurements using significant unobservable inputs (Level 3) for the three and six months ended September 30, 2013 and 2014 were as follows:
		Three Months Ended						Six Months Ended
		September 30,						September 30,
	(Amounts in thousands)	2013			2014			2013			2014
	Balance at beginning of period	$	624,889		$	777,499		$	610,881		$	645,227
	Allocation of ESOP shares to participants		3,122			804			6,049			4,391
	Change in fair value related to items recorded in mezzanine equity		23,539			(51,710	)		35,292			76,975
	Reclassification of common stock to Redeemable Common Stock		—			—			385			—
	Redemption of Redeemable Convertible Preferred Stock		(2,089	)		—			(3,146	)		—
	Termination of redemption feature on redeemable common stock upon IPO		—			(615,040	)		—			(615,040	)
	(1)    Change in redemption feature of Redeemable Convertible Preferred Stock		—			(326,623	)		—			(326,623	)
	(2)    Change in redemption feature of Deferred Compensation – unearned ESOP Shares		—			217,346			—			217,346
	Balance at end of period	$	649,461		$	2,276		$	649,461		$	2,276

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	6 Months Ended
	Sep. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]	'
Assets and Liabilities of Ads Mexicana	'
	The table below includes the assets and liabilities of ADS Mexicana that are consolidated as of March 31, 2014 and September 30, 2014. The balances exclude intercompany transactions that are eliminated upon consolidation.
	(Amounts in thousands)	March 31,		September 30,
		2014		2014
	Assets
	Current assets	$	35,272	$	36,435
	Property, plant and equipment, net		21,633		20,542
	Other noncurrent assets		2,698		2,333
	Total assets	$	59,603	$	59,310
		March 31,		September 30,
		2014		2014
	Liabilities
	Current liabilities	$	9,090	$	8,514
	Noncurrent liabilities		1,240		3,267
	Total liabilities	$	10,330	$	11,781

Investment_in_Unconsolidated_A1

Investment in Unconsolidated Affiliates (Tables)	6 Months Ended
	Sep. 30, 2014
Tigre ADS [Member]	'
Summarized Financial Data of Joint Ventures	'
	Summarized financial data as of the fiscal year ended March 31, 2014 and September 30, 2014 for the Tigre ADS joint venture is as follows:
		March 31, 2014				September 30, 2014
	(Amounts in thousands)	As reported		Maximum		As reported		Maximum
		on Balance		Exposure		on Balance		Exposure
		Sheet				Sheet
	Investment in Tigre ADS	$	22,029	$	22,029	$	21,490	$	21,490
	Receivable from Tigre ADS		8,899		8,899		5,234		5,234
	ADS’ Guarantee of Tigre ADS Debt		—		7,000		—		7,000
BaySaver [Member]	'
Summarized Financial Data of Joint Ventures	'
	Summarized financial data as of fiscal year ended March 31, 2104 and September 30, 2014 for the BaySaver joint venture is as follows:
		March 31, 2014				September 30, 2014
	(Amounts in thousands)	As reported		Maximum		As reported		Maximum
		on Balance		Exposure		on Balance		Exposure
		Sheet				Sheet
	Investment in Baysaver	$	5,202	$	5,202	$	5,217	$	5,217
	Receivable from Baysaver		6		6		216		216
Tigre-ADS USA [Member]	'
Summarized Financial Data of Joint Ventures	'
	Summarized financial data as of September 30, 2014 for the Tigre-ADS USA joint venture is as follows:
	(Amounts in thousands)	As reported		Maximum
		on Balance		Exposure
		Sheet
	Investment in Tigre-ADS USA	$	3,406	$	3,406
	Receivable from Tigre-ADS USA		25		25

Debt_Tables

Debt (Tables)	6 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Components of Debt	'
	Long-term debt as of March 31, 2014 and September 30, 2014 consisted of the following:
			March 31,			September 30,
			2014			2014
	a. Bank term loans:
	Revolving Credit Facility – ADS		$	248,100		$	193,800
	Revolving Credit Facility – ADS Mexicana			—			2,000
	Term note			97,500			95,000
	b. Senior Notes payable			100,000			100,000
	c. Mortgage notes payable			3,733			2,833
	d. Industrial revenue bonds			4,715			3,950
	Total			454,048			397,583
	Current maturities			(11,153	)		(11,148	)
	Long-term debt obligation		$	442,895		$	386,435
		a.	Revolving Credit Facility:
	The current ADS Revolving Credit Agreement (the “Revolving Credit Facility”) has been in place with several banks and was refinanced on June 12, 2013. The current bank credit facility expires in June 2018. Additionally, on December 20, 2013, we amended the private shelf agreement primarily to make certain amendments in order to permit the payment of a special dividend of $1.59 per share which was financed in full through the Revolving Credit Facility.
	The Revolving Credit Facility agreement increased the upper limit of the Revolving Credit Facility to $325,000 for ADS and $12,000 for ADS Mexicana. The Company also entered into a five-year $100,000 term note. Both the Revolving Credit Facility and the term note share the same interest rate structure.
	The Revolving Credit Facility interest rate is variable and depends upon the Company’s “pricing ratio” as defined in the agreement. The interest rate is derived from the London InterBank Offered Rate (LIBOR) or alternate base rate (Prime Rate) based upon the Company’s option. The average rate at September 30, 2014 was 2.603%. Any letters of credit outstanding reduce the availability on the revolver. The Company had outstanding letters of credit at September 30, 2014 in the amount of $8,005. The amount available for borrowing for ADS was $123,195, plus $10,000 available under a separate revolving credit facility with our subsidiary, ADS Mexicana, at September 30, 2014.
	Per terms of the Revolving Credit Facility, ADS is not required to hedge its interest exposure using interest rate swaps; however, it is currently the objective of ADS to manage its exposure to variable rate debt. On October 7, 2010, ADS executed two Spot Interest Rate Swaps on the 90-Day LIBOR interest rate. One hedge is related to the $100,000 Term Debt which was part of the previous credit agreement. This fixed rate swap exchanges a fixed rate of 1.105% for a period of four years and expired on September 1, 2014. The second hedge on the Revolving Credit Facility executed on October 7, 2010 was for $50,000 for a period of three years at a fixed rate of 0.890% and expired on September 1, 2013.
	On July 18, 2013, ADS executed two Forward Interest Rate Swaps on the 30-Day LIBOR interest rate. One swap was for $50,000 on the Revolving Credit Facility starting on September 3, 2013 at a fixed rate of 0.86% for a period of three years, expiring on September 1, 2016. The second swap executed on July 18, 2013 was for $50,000 on the Revolving Credit Facility starting on September 2, 2014 at a fixed rate of 1.08% for a period of two years, expiring on September 1, 2016.
		b.	Senior Notes payable:
	In December 2009, ADS signed an agreement with Prudential Investment Management, Inc., for the issuance of senior promissory notes (“Senior Notes”), for an aggregate amount of up to $100,000. We may make requests for purchases of the Senior Notes during the “Issuance Period,” defined as a three-year period beginning with the date of the agreement. The minimum purchase amount of Senior Notes is $10,000. Each Senior Note issued has a maximum term of no more than 10 years from the date of issuance. Interest is payable quarterly and is fixed at 5.6%. The rate is subject to an additional 200 basis point excess leverage fee if calculated leverage exceeds 3 to 1. A principal payment of $25,000 is due in September in each of fiscal years 2017, 2018, and 2019.
	In July 2013, ADS issued an additional $25,000 of senior promissory notes (“Senior Notes”) with Prudential Investment Management, Inc. Interest is payable quarterly and is fixed at 4.05%. The rate is subject to an additional 200 basis point excess leverage fee if calculated leverage exceeds 3 to 1. A principal payment of $25,000 is due in September of the fiscal year 2020.
	The carrying and fair values of the Company’s Senior Notes were $100,000 and $103,583, respectively, as of September 30, 2014. The fair value of the Senior Notes was determined based on the interest rate and terms of such borrowings to the rates and terms of similar debt available for the period.
		c.	Mortgage notes payable:
	One mortgage note payable with a fixed rate of 5.1% (Hilliard, Ohio) requires monthly installments through fiscal year 2015. In September 2014, a second mortgage with a variable interest rate was paid off (New Miami, Ohio). Land and buildings with a net book value of approximately $4,971 at September 30, 2014 collateralize the mortgage note.
		d.	Industrial revenue bonds:
	ADS issued industrial revenue bonds for the construction of four production facilities. The original bond values of $27,300 require periodic principal and interest payments through fiscal year 2019. During fiscal year 2011, two of the four bonds were retired, and during July of fiscal year 2015, one more of the bonds was retired. This leaves a remaining principal of $3,950 at September 30, 2014. The interest rate on the remaining bond is variable and computed on a weekly basis. This bond is not considered auction rate securities. The rate on this bond at September 30, 2014, was 3.84%, including a letter of credit fee of 3.75%. Land and buildings with a net book value of approximately $10,116 at September 30, 2014 collateralize the remaining bond.
	The Revolving Credit Facility and the Senior Notes require, among other provisions, that we (1) maintain a minimum fixed charge ratio; (2) maintain a minimum leverage ratio; and (3) establish certain limits on permitted transactions, principally for indebtedness, capital distributions, loans and investments, and acquisitions and dispositions of assets. Capital distributions are limited to $50 million in any fiscal year if the pro-forma leverage ratio exceeds 3.0 to 1.

Derivative_Transactions_Tables

Derivative Transactions (Tables)	6 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Summary of Fair Values for Various Derivatives	'
	A summary of the fair values for the various derivatives at March 31, 2014 and September 30, 2014 is presented below:
		March 31, 2014					September 30, 2014
	(Amounts in thousands)	Asset		(Liability)			Asset		(Liability)
	Interest rate swaps	$	—	$	(1,001	)	$	—	$	(639	)
	Diesel fuel option collars		—		—			—		(8	)
	Propylene swaps		27					—		(491	)

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Summary of Changes in Balances of Each Component of Accumulated Other Comprehensive Loss	'
	The following table presents the changes in balances of each component of Accumulated other comprehensive loss (“AOCI”) for the periods ending September 30:
	(Amounts in thousands)	Currency			Other			Accumulated Other
		Translation						Comprehensive
								Loss
	Balance at April 1, 2013	$	(860	)	$	4		$	(856	)
	Other comprehensive loss before reclassifications		(2,704	)		5			(2,699	)
	Amounts reclassified from AOCI		—			—			—
	Income tax expense (benefit)		918			(2	)		916
	Balance at September 30, 2013	$	(2,646	)	$	7		$	(2,639	)
	Balance at April 1, 2014		(5,985	)		8			(5,977	)
	Other comprehensive loss before reclassifications		(3,356	)		—			(3,356	)
	Amounts reclassified from AOCI		—			—			—
	Income tax expense		850			—			850
	Balance at September 30, 2014	$	(8,491	)	$	8		$	(8,483	)

Stock_Compensation_Tables

Stock Compensation (Tables)	6 Months Ended
	Sep. 30, 2014
Schedule of Estimate Fair Value of Stock Options Granted	'
	We estimate the fair value of stock options granted after April 1, 2006, using a Black-Scholes option-pricing model, with assumptions as follows:
		September 30,
		2013			2014
	Expected stock price volatility		44	%		40	%
	Risk-free interest rate		2.3			2.1
	Weighted-average expected option life (years)		8			8
	Dividend yield		0.84			0.86
Summary of Unvested Restricted Stock Grants	'
	The following table summarizes information about the unvested restricted stock grants as of September 30, 2014:
		Number			Weighted
		of			Average
		Shares			Grant Date
					Fair Value
	Unvested at beginning of period		311		$	12.4
	Granted		—			—
	Vested		118			12.06
	Forfeited		3			10.66
	Unvested at end of period		190		$	12.6
2000 Stock Option Plan [Member]	'
Schedule of Stock Option Transactions	'
	The stock option transactions as of the six months ended September 30 are summarized as follows:
		2013								2014
		Number			Weighted			Weighted		Number		Weighted		Weighted
		of Shares			Average			Average		of Shares		Average		Average
					Exercise			Remaining				Exercise		Remaining
					Price			Contractual				Price		Contractual
								Term						Term
	Outstanding at beginning of period		1,323			8.1			4		913		9.48		4.1
	Issued		15			13.64					78		15.74
	Exercised		94			7.77					78		7.36
	Forfeited		17			10.77					—		—
	Outstanding at end of period		1,227			8.19			3.7		913		10.2		4.3
	Exercisable and vested at end of period		836			6.8			2.1		835		9.67		3.8
	Unvested at end of period		391			11.16			7.1		78		15.74		9.9
	Vested and expected to vest at end of period		1,167			8.03			3.5		901		10.12		7.7
Schedule of Nonvested Stock Option Grants	'
	The following table summarizes information about the nonvested stock option grants as of the six months ended September 30, 2014:
		Number			Weighted
		of Shares			Average Grant
					Date Fair Value
	Unvested at beginning of period		428		$	5.82
	Granted		78			6.76
	Vested		428			5.82
	Forfeited		—			—
	Unvested at end of period		78		$	6.76
2013 Stock Option Plan [Member]	'
Schedule of Stock Option Transactions	'
	The stock option transactions as of the six months ended September 30, 2014 for the 2013 Stock Option Plan are summarized as follows:
		Number of			Weighted Average			Weighted Average
		Shares			Exercise Price			Remaining
								Contractual Term
	Outstanding at beginning of period		1,911		$	13.64			9.42
	Issued—equity classified		—			—			—
	Issued—liability classified		—			—			—
	Exercised		—			—			—
	Forfeited—equity classified		—			—			—
	Outstanding at end of period		1,911			13.64			8.92
	Exercisable and vested at end of period		408			13.64			8.92
	Unvested at end of period		1,503			13.64			8.92
	Vested and expected to vest at end of period		1,881			13.64			8.92
	Fair value of options granted during the period		—
Schedule of Nonvested Stock Option Grants	'
	The following table summarizes information about the nonvested stock option grants as of September 30, 2014:
		Number			Weighted
		of Shares			Average Grant
					Date Fair Value
	Unvested at beginning of period		1,911		$	6.22
	Granted		—			—
	Vested		408			13.64
	Forfeited		—			—
	Unvested at end of period		1,503		$	3.64
Non Employee Director Compensation Plan [Member]	'
Schedule of Nonvested Stock Option Grants	'
	The following table summarizes information about the unvested Non-Employee Director Compensation stock grants as of September 30, 2014:
		Number			Weighted
		of			Average Grant
		Shares			Date Fair Value
	Unvested at beginning of period		—		$	—
	Granted		48			18.88
	Vested		—			—
	Forfeited		—			—
	Unvested at end of period		48		$	—

Net_Income_Per_Share_Tables

Net Income Per Share (Tables)	6 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Summary of Net Income Per Share	'
	The following table presents information necessary to calculate net income per share for the three and six months ended September 30, 2013 and 2014, as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive:
		Three Months Ended						Six Months Ended
		September 30,						September 30,
	(Amounts in thousands, except per share data)	2013			2014			2013			2014
	NET INCOME PER SHARE—BASIC:
	Net income attributable to ADS	$	17,322		$	22,390		$	33,618		$	36,631
	Adjustment for:
	Change in fair value of Redeemable Convertible Preferred Stock		(3,186	)		7,319			(4,764	)		(11,054	)
	Dividends to Redeemable Convertible Preferred Stockholders		(214	)		(37	)		(430	)		(75	)
	Dividends paid to unvested restricted stockholders		(8	)		—			(16	)		—
	Net income available to common stockholders and participating securities		13,914			29,672			28,408			25,502
	Undistributed income allocated to participating securities		(1,536	)		(3,404	)		(3,124	)		(3,040	)
	Net income available to common stockholders – Basic		12,378			26,268			25,284			22,462
	Weighted average number of common shares outstanding – Basic		47,250			51,518			47,220			49,538
	Net income per common share – Basic	$	0.26		$	0.51		$	0.54		$	0.45
	NET INCOME PER SHARE—DILUTED:
	Net income available to common stockholders – Basic	$	12,378		$	26,268		$	25,284		$	22,462
	Undistributed income allocated to participating securities		—			2,401			—			1,073
	Net income available to common stockholders – Diluted		12,378			28,669			25,284			23,535
	Weighted average number of common shares outstanding – Basic		47,250			51,518			47,220			49,538
	Assumed conversion of preferred stock		—			4,714			—			2,382
	Assumed exercise of stock options		329			231			414			278
	Weighted average number of common shares outstanding – Diluted		47,579			56,463			47,634			52,198
	Net income per common share – Diluted	$	0.26		$	0.51		$	0.53		$	0.45
	Potentially dilutive securities excluded as anti-dilutive		38			22			63			57

Business_Segments_Information_

Business Segments Information (Tables)	6 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Schedule of Revenue from Reportable Segments by Product Type	'
	The following table sets forth reportable segment information with respect to the amount of net sales contributed by each class of similar products of our consolidated gross profit for the three and six months ended September 30, 2013 and 2014, respectively:
			Three Months Ended						Six Months Ended
			September 30,						September 30,
	(Amounts in thousands)		2013			2014			2013			2014
	Domestic
	Pipe			224,064			241,872			413,206			459,179
	Allied Products			72,008			77,770			138,455			151,945
	Total Domestic		$	296,072		$	319,642		$	551,661		$	611,124
	International
	Pipe			30,062			36,422			59,649			66,359
	Allied Products			7,106			8,660			15,032			15,538
	Total International		$	37,168		$	45,082			74,681			81,897
	Total net sales		$	333,240		$	364,724		$	626,342		$	693,021
Schedule of Additional Financial Information Attributable to Reportable Segments	'
	The following sets forth certain additional financial information attributable to our reportable segments for the three and six months ended September 30, 2013, and 2014, respectively:
			Three Months Ended						Six Months Ended
			September 30,						September 30,
	(Amounts in thousands)		2013			2014			2013			2014
	Net sales
	Domestic			296,072			319,642			551,661			611,124
	International			37,168			45,082			74,681			81,897
	Total		$	333,240		$	364,724		$	626,342		$	693,021
	Gross profit
	Domestic			65,278			74,572			122,830			139,362
	International			7,941			7,870			16,392			15,113
	Total		$	73,219		$	82,442		$	139,222		$	154,475
	Segment Adjusted EBITDA
	Domestic			46,802			56,124			91,880			101,893
	International			4,765			4,334			9,229			7,770
	Total		$	51,567		$	60,458		$	101,109		$	109,663
	Interest expense, net
	Domestic			3,844			4,325			7,933			8,938
	International			22			13			34			15
	Total		$	3,866		$	4,338		$	7,967		$	8,953
	Capital expenditures
	Domestic			7,065			7,898			18,003			14,835
	International			1,493			295			3,697			808
	Total		$	8,558		$	8,193		$	21,700		$	15,643
	Depreciation and amortization
	Domestic			12,701			12,486			25,569			24,952
	International			1,186			1,297			2,419			2,534
	Total		$	13,887		$	13,783		$	27,988		$	27,486
	Equity in net income (loss) of unconsolidated affiliates
	Domestic			114			251			114			404
	International			(211	)		(253	)		(459	)		(1,027	)
	Total		$	(97	)	$	(2	)	$	(345	)	$	(623	)
	The following sets forth certain additional financial information attributable to our reporting segments as of March 31, 2014 and September 30, 2014, respectively
			March 31,			September 30,
			2014			2014
	Investment in unconsolidated affiliates
	Domestic		$	5,202		$	8,623
	International			20,029			21,490
	Total		$	25,231		$	30,113
	Total identifiable assets
	Domestic		$	835,736		$	908,041
	International			115,167			125,641
	Eliminations			(13,308	)		(15,458	)
	Total		$	937,595		$	1,018,224
Schedule of Reconciliation of Segment EBITDA and Segment Adjusted EBITDA to Net Income	'
	Reconciliation of Segment EBITDA and Segment Adjusted EBITDA to Net Income
			Three Months Ended September 30,
			2013						2014
	(Amounts in thousands)		Domestic			International			Domestic			International
	Reconciliation of Segment EBITDA and Segment Adjusted EBITDA to Net Income:
	Net income attributable to ADS		$	15,218		$	2,104		$	20,612		$	1,778
	Depreciation and amortization (a)			12,702			1,519			12,724			1,705
	Interest expense, net			3,844			22			4,325			13
	Income tax expense			11,449			793			13,525			537
	Segment EBITDA			43,213			4,438			51,186			4,033
	Derivative fair value adjustments			319			—			67			—
	Foreign currency transaction losses			—			(181	)		—			(205	)
	Unconsolidated affiliates interest and tax			—			98			53			183
	Management fee to minority interest holder JV			—			410			—			323
	Share-based compensation			764			—			2,131			—
	ESOP deferred compensation			2,506			—			2,687			—
	Transaction costs (b)			—			—			—			—
	Segment Adjusted EBITDA		$	46,802		$	4,765		$	56,124		$	4,334
		(a)	Includes our proportionate share of depreciation and amortization expense of $334 and $646 related to our Tigre ADS joint venture, BaySaver joint venture and Tigre-ADS USA joint venture, which is included in Equity in net loss of unconsolidated affiliates in our Condensed Consolidated Statements of Income for the three months ended September 30, 2013 and 2014, respectively.
		(b)	Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with our debt refinancing and completion of the IPO.
	Reconciliation of Segment EBITDA and Segment Adjusted EBITDA to Net Income
			Six Months Ended September 30,
			2013						2014
	(Amounts in thousands)		Domestic			International			Domestic			International
	Reconciliation of Segment EBITDA and Segment Adjusted EBITDA to Net Income:
	Net income attributable to ADS		$	29,675		$	3,943		$	34,054		$	2,577
	Depreciation and amortization (a)			25,571			3,094			25,398			3,360
	Interest expense, net			7,933			34			8,938			15
	Income tax expense			21,895			1,413			22,741			1,016
	Segment EBITDA			85,074			8,484			91,131			6,968
	Derivative fair value adjustments			238			—			163			—
	Foreign currency transaction losses			—			(87	)		—			(75	)
	Unconsolidated affiliates interest and tax			—			228			94			319
	Management fee to minority interest holder JV			—			604			—			558
	Share-based compensation			1,424			—			4,416			—
	ESOP deferred compensation			5,026			—			5,374			—
	Transaction costs (b)			118			—			715			—
	Segment Adjusted EBITDA		$	91,880		$	9,229		$	101,893		$	7,770
		(a)	Includes our proportionate share of depreciation and amortization expense of $677 and $1,272 related to our Tigre ADS joint venture, BaySaver joint venture and Tigre-ADS USA joint venture, which is included in Equity in net loss of unconsolidated affiliates in our Condensed Consolidated Statements of Income for the six months ended September 30, 2013 and 2014, respectively.
		(b)	Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with our debt refinancing and completion of the IPO.

Background_and_Summary_of_Sign2

Background and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	6 Months Ended		0 Months Ended			6 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Mar. 31, 2014	Aug. 22, 2014	Jul. 30, 2014	Jul. 11, 2014	Sep. 30, 2014	Aug. 22, 2014	Jul. 30, 2014
	Segment		IPO [Member]	IPO [Member]	IPO [Member]	IPO [Member]	IPO [Member]	IPO [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]	'	'	'	'	'	'	'	'
Number of reportable segments	2	'	'	'	'	'	'	'
Common and preferred stock conversion split ratio, description	'	'	'	'	'	'4.707-for-one split	'	'
Common and preferred stock conversion split ratio	'	'	'	'	4.707	'	'	'
Additional shares issued	'	'	600	5,289	'	'	'	'
Common stock, shares issued	153,560	109,951	'	'	'	'	'	52,881
Common stock, shares outstanding	52,935	9,141	'	'	'	'	'	52,881
Net proceeds from initial public offering	$79,131,000	'	'	$79,131,000	'	'	'	'
Underwriter discounts and commissions on initial public offering	'	'	'	5,500,000	'	'	'	'
Share price	'	'	'	'	'	'	$16	$16
Other offering expenses	'	'	'	6,800,000	'	'	'	'
Indebtedness under the revolving portion of credit facility	'	'	'	$72,300,000	'	'	'	'

Sale_of_Business_Additional_In

Sale of Business - Additional Information (Detail) (USD $)	0 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Jun. 28, 2013	Sep. 30, 2013	Jun. 28, 2013
Asset Retirement Obligation Disclosure [Abstract]	'	'	'
Proceeds from sale of assets/business	$5,877	$5,877	'
Net book value of assets	'	'	1,029
Gain on sale of assets/business	$4,848	$4,848	'

Property_Plant_and_Equipment_N2

Property, Plant and Equipment - Net - Schedule of Property, Plant, Equipment and Depreciation Expense on Assets (Detail) (USD $)	Sep. 30, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	$696,738	$683,556
Less accumulated depreciation	-408,568	-391,474
Property, plant and equipment - net	288,170	292,082
Land, Buildings and Improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	154,709	151,088
Machinery and Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property, plant and equipment, gross	$542,029	$532,468

Property_Plant_and_Equipment_D

Property, Plant and Equipment - Depreciation Expense on Property, Plant and Equipment (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Property, Plant and Equipment [Abstract]	'	'	'	'
Depreciation expense	$9,239	$9,196	$18,399	$18,606

Inventories_Schedule_of_Invent

Inventories - Schedule of Inventories (Detail) (USD $)	Sep. 30, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Raw materials	$58,673	$52,267
Finished goods	188,695	208,033
Total inventory	$247,368	$260,300

Inventories_Additional_Informa

Inventories - Additional Information (Detail) (USD $)	Sep. 30, 2014	Mar. 31, 2014
Inventory Disclosure [Abstract]	'	'
Work-in-process inventories	$0	$0

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Carrying Amount of Goodwill by Reportable Segment (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Goodwill [Line Items]	'
Beginning balance	$86,297
Currency translation	-17
Ending balance	86,280
Domestic Segment [Member]	'
Goodwill [Line Items]	'
Beginning balance	85,702
Currency translation	'
Ending balance	85,702
International Segment [Member]	'
Goodwill [Line Items]	'
Beginning balance	595
Currency translation	-17
Ending balance	$578

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) (USD $)	Sep. 30, 2014	Mar. 31, 2014
Finite And Indefinite Lived Intangible Assets [Line Items]	'	'
Gross Intangible	$110,519,000	$110,356,000
Accumulated Amortization	-62,241,000	-56,162,000
Net Intangible	48,278,000	54,194,000
Intangible Assets, Gross (Excluding Goodwill)	122,507,000	122,346,000
Intangible Assets Accumulated Amortization	-62,241,000	-56,162,000
Intangible assets, net	60,266,000	66,184,000
Trademarks [Member]	'	'
Finite And Indefinite Lived Intangible Assets [Line Items]	'	'
Indefinite-Lived Intangible Assets (Excluding Goodwill)	11,988,000	11,990,000
Indefinite Lived Intangible Assets Accumulated Amortization	'	'
Indefinite-Lived Intangible Assets (Excluding Goodwill)	11,988,000	11,990,000
Developed Technology [Member]	'	'
Finite And Indefinite Lived Intangible Assets [Line Items]	'	'
Gross Intangible	40,579,000	40,579,000
Accumulated Amortization	-24,497,000	-22,588,000
Net Intangible	16,082,000	17,991,000
Customer Lists [Member]	'	'
Finite And Indefinite Lived Intangible Assets [Line Items]	'	'
Gross Intangible	39,252,000	39,252,000
Accumulated Amortization	-24,530,000	-22,079,000
Net Intangible	14,722,000	17,173,000
Patents [Member]	'	'
Finite And Indefinite Lived Intangible Assets [Line Items]	'	'
Gross Intangible	6,338,000	6,175,000
Accumulated Amortization	-3,235,000	-2,921,000
Net Intangible	3,103,000	3,254,000
Contract Agreements [Member]	'	'
Finite And Indefinite Lived Intangible Assets [Line Items]	'	'
Gross Intangible	11,493,000	11,493,000
Accumulated Amortization	-5,256,000	-4,280,000
Net Intangible	6,237,000	7,213,000
Trademarks [Member]	'	'
Finite And Indefinite Lived Intangible Assets [Line Items]	'	'
Gross Intangible	12,857,000	12,857,000
Accumulated Amortization	-4,723,000	-4,294,000
Net Intangible	$8,134,000	$8,563,000

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Summary of Amortization Expense (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'	'	'	'
Amortization expense	$2,638	$2,861	$5,279	$5,722

Fair_Value_Measurement_Summary

Fair Value Measurement - Summary of Assets and Liabilities Carried at Fair Value (Detail) (USD $)	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Deferred compensation - unearned ESOP shares	($217,346)	'	($197,888)	'	'	'
Level 3 [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Deferred compensation - unearned ESOP shares	217,346	'	'	'	'	'
Total liabilities & mezzanine equity at fair value on a recurring basis	2,276	777,499	645,227	649,461	624,889	610,881
Interest Rate Swaps [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative assets	'	'	'	'	'	'
Derivative liability	639	'	1,001	'	'	'
Propylene Swaps [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative assets	'	'	27	'	'	'
Derivative liability	491	'	'	'	'	'
Fair Value, Measurements, Recurring [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Total assets at fair value on a recurring basis	'	'	27	'	'	'
Contingent consideration for acquisitions	2,276	'	2,276	'	'	'
Redeemable Common Stock	'	'	549,119	'	'	'
Redeemable Convertible Preferred Stock	'	'	291,720	'	'	'
Deferred compensation - unearned ESOP shares	'	'	-197,888	'	'	'
Total liabilities & mezzanine equity at fair value on a recurring basis	3,414	'	646,228	'	'	'
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Total assets at fair value on a recurring basis	'	'	'	'	'	'
Contingent consideration for acquisitions	'	'	'	'	'	'
Redeemable Common Stock	'	'	'	'	'	'
Redeemable Convertible Preferred Stock	'	'	'	'	'	'
Deferred compensation - unearned ESOP shares	'	'	'	'	'	'
Total liabilities & mezzanine equity at fair value on a recurring basis	'	'	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Total assets at fair value on a recurring basis	'	'	27	'	'	'
Contingent consideration for acquisitions	'	'	'	'	'	'
Redeemable Common Stock	'	'	'	'	'	'
Redeemable Convertible Preferred Stock	'	'	'	'	'	'
Deferred compensation - unearned ESOP shares	'	'	'	'	'	'
Total liabilities & mezzanine equity at fair value on a recurring basis	1,138	'	1,001	'	'	'
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Total assets at fair value on a recurring basis	'	'	'	'	'	'
Contingent consideration for acquisitions	2,276	'	2,276	'	'	'
Redeemable Common Stock	'	'	549,119	'	'	'
Redeemable Convertible Preferred Stock	'	'	291,720	'	'	'
Deferred compensation - unearned ESOP shares	'	'	-197,888	'	'	'
Total liabilities & mezzanine equity at fair value on a recurring basis	2,276	'	645,227	'	'	'
Fair Value, Measurements, Recurring [Member] | Diesel Fuel Contracts [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative assets	'	'	27	'	'	'
Derivative liability	8	'	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Diesel Fuel Contracts [Member] | Level 1 [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative assets	'	'	'	'	'	'
Derivative liability	'	'	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Diesel Fuel Contracts [Member] | Level 2 [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative assets	'	'	27	'	'	'
Derivative liability	8	'	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Diesel Fuel Contracts [Member] | Level 3 [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative assets	'	'	'	'	'	'
Derivative liability	'	'	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative liability	639	'	1,001	'	'	'
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member] | Level 1 [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative liability	'	'	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member] | Level 2 [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative liability	639	'	1,001	'	'	'
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member] | Level 3 [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative liability	'	'	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Propylene Swaps [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative liability	491	'	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Propylene Swaps [Member] | Level 1 [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative liability	'	'	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Propylene Swaps [Member] | Level 2 [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative liability	491	'	'	'	'	'
Fair Value, Measurements, Recurring [Member] | Propylene Swaps [Member] | Level 3 [Member]	'	'	'	'	'	'
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'
Derivative liability	'	'	'	'	'	'

Fair_Value_Measurement_Summary1

Fair Value Measurement - Summary of Changes in Fair Value of Recurring Fair Value Measurements Using Unobservable Inputs (Detail) (USD $)	6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013	Sep. 30, 2013
				Level 3 [Member]	Level 3 [Member]	Level 3 [Member]	Level 3 [Member]	Redeemable Convertible Preferred Stock [Member]	Redeemable Convertible Preferred Stock [Member]	Redeemable Convertible Preferred Stock [Member]
									Level 3 [Member]	Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'	'	'	'	'	'	'	'	'
Beginning balance	'	'	'	$777,499	$624,889	$645,227	$610,881	'	'	'
Allocation of ESOP shares to participants	983	-1,023	'	804	3,122	4,391	6,049	'	'	'
Change in fair value related to items recorded in mezzanine equity	'	'	'	-51,710	23,539	76,975	35,292	'	'	'
Reclassification of common stock to Redeemable Common Stock	'	-385	'	'	'	'	385	'	'	'
Redemption of Redeemable Convertible Preferred Stock	'	'	'	'	'	'	'	-3,146	-2,089	-3,146
Termination of redemption feature on redeemable common stock upon IPO	'	'	'	-615,040	'	-615,040	'	'	'	'
Change in redemption feature of Redeemable Convertible Preferred Stock	'	'	'	-326,623	'	-326,623	'	'	'	'
Change in redemption feature of Deferred Compensation - unearned ESOP Shares	-217,346	'	-197,888	217,346	'	217,346	'	'	'	'
Ending balance	'	'	'	$2,276	$649,461	$2,276	$649,461	'	'	'

Fair_Value_Measurement_Additio

Fair Value Measurement - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended
	Sep. 30, 2014	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'	'
Fair value of assets and liabilities transfers amount	$0	$0
Weighted average costs of capital percentage	'	11.00%

Variable_Interest_Entities_Add

Variable Interest Entities - Additional Information (Detail) (ADS Mexicana [Member], Variable Interest Entity, Primary Beneficiary [Member], USD $)	Apr. 30, 2013	Apr. 30, 2013	Apr. 30, 2013	Sep. 30, 2014
In Thousands, unless otherwise specified	Maximum [Member]	Minimum [Member]	ADS World Wide [Member]	Performance Guarantee [Member]
Variable Interest Entity [Line Items]	'	'	'	'
Ownership percentage	51.00%	50.00%	'	'
Additional equity interest in its consolidated subsidiary	'	'	1.00%	'
Additional equity interest in its consolidated subsidiary, payment	'	'	$520	'
Guarantee percentage on credit facility	'	'	'	100.00%
Maximum potential guarantee payments	'	'	'	$12,000
Guarantee description	'	'	'	'We are the guarantor of 100% of ADS Mexicana's credit facility

Variable_Interest_Entities_Ass

Variable Interest Entities - Assets and Liabilities of Ads Mexicana (Detail) (USD $)	Sep. 30, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Assets	'	'
Current assets	$514,917	$428,499
Property, plant and equipment, net	288,170	292,082
Other noncurrent assets	68,591	64,533
Total assets	1,018,224	937,595
Liabilities	'	'
Current liabilities	190,546	164,592
Total liabilities	655,642	691,980
ADS Mexicana [Member]	'	'
Assets	'	'
Current assets	36,435	35,272
Property, plant and equipment, net	20,542	21,633
Other noncurrent assets	2,333	2,698
Total assets	59,310	59,603
Liabilities	'	'
Current liabilities	8,514	9,090
Noncurrent liabilities	3,267	1,240
Total liabilities	$11,781	$10,330

Recovered_Sheet1

Investment In Unconsolidated Affiliates - Additional Information (Detail) (USD $)	6 Months Ended				6 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Jul. 15, 2013	Jul. 15, 2013	Sep. 30, 2014	Apr. 07, 2014
	JointVenture				Tigre ADS [Member]	BaySaver [Member]	BaySaver [Member]	BaySaver [Member]	Tigre-ADS USA [Member]	Tigre-ADS USA [Member]
								Investments in Majority-owned Subsidiaries [Member]
Investments in and Advances to Affiliates [Line Items]	'	'	'	'	'	'	'	'	'	'
Number of unconsolidated joint venture participated	3	'	'	'	'	'	'	'	'	'
Percentage of ownership	'	'	'	'	50.00%	55.00%	55.00%	'	49.00%	49.00%
Percentage of debt guarantee	'	'	'	'	50.00%	'	'	'	'	'
Maximum potential payment under guarantee	'	'	'	'	$7,000,000	'	'	'	'	'
Cash	6,581,000	3,931,000	2,036,000	1,361,000	'	'	'	3,500,000	'	'
Inventories	247,368,000	260,300,000	'	'	'	'	'	1,285,000	'	'
Intangible assets	60,266,000	66,184,000	'	'	'	'	'	0	'	'
Percentage of voting interest	'	'	'	'	'	'	50.00%	'	'	'
Percentage of minority ownership	'	'	'	'	'	'	45.00%	'	'	'
Amortization expenses adjustment	1,739,000	'	'	'	'	'	'	'	'	'
Amortization Period	'10 years	'	'	'	'	'	'	'	'	'
Amount paid for acquiring shares	'	'	'	'	'	'	'	'	'	$3,566,000

Recovered_Sheet2

Investment In Unconsolidated Affiliates - Summarized Financial Data of Joint Ventures (Detail) (USD $)	Sep. 30, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Investments in and Advances to Affiliates [Line Items]	'	'
Investment in unconsolidated affiliates	$30,113	$25,231
As reported on Balance Sheet [Member] | Tigre ADS [Member]	'	'
Investments in and Advances to Affiliates [Line Items]	'	'
Investment in unconsolidated affiliates	21,490	22,029
Receivable from unconsolidated joint venture	5,234	8,899
ADS' guarantee of unconsolidated joint venture debt	'	'
As reported on Balance Sheet [Member] | BaySaver [Member]	'	'
Investments in and Advances to Affiliates [Line Items]	'	'
Investment in unconsolidated affiliates	5,217	5,202
Receivable from unconsolidated joint venture	216	6
As reported on Balance Sheet [Member] | Tigre-ADS USA [Member]	'	'
Investments in and Advances to Affiliates [Line Items]	'	'
Investment in unconsolidated affiliates	3,406	'
Receivable from unconsolidated joint venture	25	'
Maximum Exposure [Member] | Tigre ADS [Member]	'	'
Investments in and Advances to Affiliates [Line Items]	'	'
Investment in unconsolidated affiliates	21,490	22,029
Receivable from unconsolidated joint venture	5,234	8,899
ADS' guarantee of unconsolidated joint venture debt	7,000	7,000
Maximum Exposure [Member] | BaySaver [Member]	'	'
Investments in and Advances to Affiliates [Line Items]	'	'
Investment in unconsolidated affiliates	5,217	5,202
Receivable from unconsolidated joint venture	216	6
Maximum Exposure [Member] | Tigre-ADS USA [Member]	'	'
Investments in and Advances to Affiliates [Line Items]	'	'
Investment in unconsolidated affiliates	3,406	'
Receivable from unconsolidated joint venture	$25	'

Debt_LongTerm_Debt_Detail

Debt - Long-Term Debt (Detail) (USD $)	Sep. 30, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Revolving credit facility	$8,005	'
Long term debt	397,583	454,048
Current maturities	-11,148	-11,153
Long-term debt obligation	386,435	442,895
ADS [Member] | Revolving Credit Facility [Member]	'	'
Debt Instrument [Line Items]	'	'
Revolving credit facility	193,800	248,100
ADS Mexicana [Member] | Revolving Credit Facility [Member]	'	'
Debt Instrument [Line Items]	'	'
Revolving credit facility	2,000	'
Industrial Revenue Bonds [Member]	'	'
Debt Instrument [Line Items]	'	'
Industrial revenue bonds	3,950	4,715
Term Notes [Member]	'	'
Debt Instrument [Line Items]	'	'
Notes payable	95,000	97,500
Senior Notes Payable [Member]	'	'
Debt Instrument [Line Items]	'	'
Senior notes	100,000	100,000
Mortgage Notes Payable [Member]	'	'
Debt Instrument [Line Items]	'	'
Notes payable	$2,833	$3,733

Debt_LongTerm_Debt_Parenthetic

Debt - Long-Term Debt (Parenthetical) (Detail) (USD $)

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

1 Months Ended

1 Months Ended

6 Months Ended

1 Months Ended

6 Months Ended

3 Months Ended

In Thousands, except Per Share data, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Mar. 31, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Mar. 31, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2009

Sep. 30, 2014

Jul. 31, 2013

Dec. 31, 2009

Sep. 30, 2014

Jul. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Derivative

ADS Mexicana [Member]

Industrial Revenue Bonds [Member]

Industrial Revenue Bonds [Member]

Industrial Revenue Bonds [Member]

Mortgage Notes Payable [Member]

Term Loan Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Senior Notes Payable [Member]

Senior Notes Payable [Member]

Senior Notes Payable [Member]

Senior Notes Payable [Member]

Senior Notes Payable [Member]

Industrial revenue bonds [Member]

Industrial revenue bonds [Member]

Maximum [Member]

Minimum [Member]

Facility

Letter of Credit [Member]

MortgageLoan

ADS [Member]

ADS [Member]

ADS Mexicana [Member]

Interest Rate Swaps [Member]

Forward Stating Interest Rate Swap [Member]

Forward Second Interest Rate Swap [Member]

ADS [Member]

ADS [Member]

ADS [Member]

Bonds

Bonds

Industrial Revenue Bonds [Member]

Industrial Revenue Bonds [Member]

Derivative

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Special dividend per share

'

'

'

'

'

'

'

'

$1.59

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of credit facility expiration date

'

'

'

'

'

'

'

'

'2018-06

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revolving credit facility outstanding

'

'

'

'

'

'

'

'

'

$325,000

'

$12,000

'

'

'

'

'

'

'

'

'

'

'

'

Revolving credit facility outstanding

'

'

'

'

'

'

'

100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Term loan maturity period

'

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revolving credit facility interest rate

2.60%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding letters of credit

8,005

'

'

'

'

'

'

'

'

193,800

248,100

2,000

'

'

'

'

'

'

'

'

'

'

'

'

Borrowing under line of credit facility

123,195

'

10,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of interest rate derivative

2

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

Derivative, type of interest rate paid on swap

'90-Day LIBOR interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'30-Day LIBOR interest rate

'

'

'

'

'

'

'

'

'

'

Term debt amount

100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Rate of fixed interest swap

'

'

'

'

'

'

'

1.11%

0.89%

'

'

'

'

0.86%

1.08%

'

'

'

'

'

'

'

'

'

Date of maturity of interest rate swap

1-Sep-13

'

'

'

'

'

'

1-Sep-14

'

'

'

'

'

1-Sep-16

1-Sep-16

'

'

'

'

'

'

'

'

'

Maturity period of interest rate derivative

'

'

'

'

'

'

'

'4 years

'3 years

'

'

'

'

'3 years

'2 years

'

'

'

'

'

'

'

'

'

Derivative instrument notional amount

'

'

'

'

'

'

'

50,000

50,000

'

'

'

'

50,000

'

'

'

'

'

'

'

'

'

'

Date of maturity of interest rate swap

'

'

'

'

'

'

'

'

7-Oct-10

'

'

'

18-Jul-13

18-Jul-13

'

'

'

'

'

'

'

'

'

'

Date of Inception of interest rate swap

'

'

'

'

'

'

'

'

2-Sep-14

'

'

'

'

3-Sep-13

'

'

'

'

'

'

'

'

'

'

Debt instrument leverage fee

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'The rate is subject to an additional 200 basis point excess leverage fee if calculated leverage exceeds 3 to 1.

'

'

'

'

Aggregate amount on promissory notes issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100,000

'

'

'

'

'

Minimum purchase amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10,000

'

'

'

'

'

'

'

'

Maximum term of senior notes issuance

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 years

'

'

'

'

'

'

'

'

Quarterly interest payable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.60%

'

4.05%

'

'

'

'

'

'

Additional principal payments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25,000

'

25,000

'

'

'

'

'

'

Additional senior promissory notes issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25,000

'

'

'

'

'

'

Senior notes

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100,000

'

'

'

'

'

'

'

Senior notes, fair value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

103,583

'

'

'

'

'

'

'

Number of mortgage notes payable with fixed rate

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fixed interest rate

'

'

'

'

'

'

5.10%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Land and buildings net book value

'

'

'

'

'

'

4,971

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of bonds retired

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1

2

'

'

Number of production facilities

'

'

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Original bond value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

27,300

'

'

Industrial revenue bonds

'

'

'

3,950

4,715

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,950

'

'

Interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.84%

'

'

Debt instrument fee percentage

'

'

'

'

'

3.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Collateral amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10,116

'

'

Maximum capital distributions

'

$3,079

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$50,000

'

Leverage ratio, minimum

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3

Derivative_Transactions_Additi

Derivative Transactions - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Unrealized Gain (Loss) on Derivatives and Commodity Contracts [Abstract]	'	'	'	'
Losses on mark-to-market adjustments for changes in fair value on derivative	($67)	($319)	($163)	($238)

Derivative_Transactions_Summar

Derivative Transactions - Summary of Fair Values for Various Derivatives (Detail) (USD $)	Sep. 30, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Interest Rate Swaps [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Asset	'	'
(Liability)	-639	-1,001
Diesel Fuel Option Collars [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Asset	'	'
(Liability)	-8	'
Propylene Swaps [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Asset	'	27
(Liability)	($491)	'

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014
Contingencies And Commitments [Line Items]	'	'	'	'	'
Total rent expense	$4,554	$6,049	$10,342	$11,607	'
Maximum loss contingency estimated	364	'	364	'	420
Property, Plant and Equipment Purchase Commitments [Member]	'	'	'	'	'
Contingencies And Commitments [Line Items]	'	'	'	'	'
Total purchase commitment	11,379	'	11,379	'	'
Raw Materials Purchase Commitments [Member]	'	'	'	'	'
Contingencies And Commitments [Line Items]	'	'	'	'	'
Total purchase commitment	$20,153	'	$20,153	'	'
Quantity of raw materials to be purchased under the purchase commitment	30,000	'	30,000	'	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	'	'	($5,977)	($856)
Other comprehensive loss before reclassifications	'	'	-3,356	-2,699
Amounts reclassified from AOCI	'	'	0	'
Income tax expense (benefit)	1,038	246	850	916
Ending Balance	-8,483	-2,639	-8,483	-2,639
Currency Translation [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	'	'	-5,985	-860
Other comprehensive loss before reclassifications	'	'	-3,356	-2,704
Amounts reclassified from AOCI	'	'	0	'
Income tax expense (benefit)	'	'	850	918
Ending Balance	-8,491	-2,646	-8,491	-2,646
Other [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning Balance	'	'	8	4
Other comprehensive loss before reclassifications	'	'	0	5
Amounts reclassified from AOCI	'	'	0	'
Income tax expense (benefit)	'	'	0	-2
Ending Balance	$8	$7	$8	$7

Redeemable_Convertible_Preferr1

Redeemable Convertible Preferred Stock - Additional Information (Detail) (Redeemable Convertible Preferred Stock [Member], USD $)	6 Months Ended
	Sep. 30, 2014
Redeemable Convertible Preferred Stock [Member]	'
Schedule Of Redeemable Convertible Preferred Stock [Line Items]	'
Preferred stock, dividend rate, percentage	2.50%
Redeemable convertible preferred stock, shares	0.7692
Preferred stock, conversion basis	'One share for every 0.7692 share of common stock
Redeemable convertible preferred stock, per share	$0.78

Stock_Compensation_Additional_

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

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

1 Months Ended

6 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

In Thousands, except Per Share data, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Aug. 31, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

31-May-14

Aug. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 06, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

IPO [Member]

Redeemable Convertible Preferred Stock [Member]

Redeemable Convertible Preferred Stock [Member]

2013 Stock Option Plan [Member]

2013 Stock Option Plan [Member]

2013 Stock Option Plan [Member]

2013 Stock Option Plan [Member]

2013 Stock Option Plan [Member]

2000 Stock Option Plan [Member]

2000 Stock Option Plan [Member]

2000 Stock Option Plan [Member]

2000 and 2013 Stock Option Plan [Member]

2000 and 2013 Stock Option Plan [Member]

2000 and 2013 Stock Option Plan [Member]

2000 and 2013 Stock Option Plan [Member]

Non Employee Director Compensation Plan [Member]

Non Employee Director Compensation Plan [Member]

Non Employee Director Compensation Plan [Member]

Non Employee Director Compensation Plan [Member]

Non Employee Director Compensation Plan [Member]

Vesting Immediately [Member]

Vesting Immediately [Member]

Employee Stock Options [Member]

Employee Stock Options [Member]

Employee Stock Options [Member]

Employee Stock Options [Member]

Employee Stock Options [Member]

Employee Stock Options [Member]

Employee Stock Options [Member]

Employee Stock Options [Member]

Directors

Management [Member]

Chief Executive Officer [Member]

Management [Member]

General and Administrative Expense [Member]

General and Administrative Expense [Member]

General and Administrative Expense [Member]

General and Administrative Expense [Member]

Installment

Installment

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of shares allocated under ESOP, per share

'

'

'

'

'

'

'

'

'

'

'

$12.50

$11.26

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Average fair value of shares allocated under ESOP, per share

'

'

$12.34

$10.92

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Compensation expense related to allocation of ESOP shares

$2,687

$2,506

$5,374

$5,026

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock awards, expiration period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 years

'10 years

'

'

'10 years

'

'

'

'

'

'

'

'

'

Stock awards, number of annual installments for vesting

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5

'

'

'

3

'

'

'

'

'

'

'

'

'

Stock-based awards, number of shares authorized for grant

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,412

500

'

'

'

'

'

'

'

'

'

'

282

'

282

'

Stock-based awards, vesting period

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'4 years

'

'

'

'

'

'

'

'

'

'

'

'

Share-based compensation expense

'

'

'

'

639

593

1,548

1,178

0

385

'

'

'

'

'

'

'

'

'

'

'

1,042

171

2,418

246

'

450

0

450

0

Stock-based awards, unrecognized compensation expense

5,307

9,319

5,307

9,319

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock based awards, shares available for grant

'

'

'

'

333

'

333

'

'

'

'

'

'

1,412

'

'

'

'

1,097

'

'

'

'

'

'

'

'

'

'

'

New grant, number of shares issued

'

'

'

'

'

'

'

'

'

'

78

'

'

'

'

'

'

'

78

15

'

'

'

'

'

'

'

'

48

'

New grant, fair market value of shares issued

'

'

'

'

'

'

'

'

'

'

$15.74

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrecognized compensation expense

'

'

'

'

$2,306

'

$2,306

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$450

'

$450

'

Stock-based awards, vesting period from the date of issuance

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'1 year

'

Shares granted

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

48

'

'

'

'

Number of directors to whom shares were granted

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7

'

'

'

'

Fair market value of the granted shares

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$18.88

'

'

$18.88

'

Vesting date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

27-Feb-15

Shares available for grant

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

234

'

Stock_Compensation_Schedule_of

Stock Compensation - Schedule of Estimate Fair Value of Stock Options Granted (Detail) (Employee Stock Options [Member])	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Expected stock price volatility	40.00%	44.00%
Risk-free interest rate	2.10%	2.30%
Dividend yield	0.86%	0.84%
Weighted Average [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Weighted-average expected option life (years)	'8 years	'8 years

Stock_Compensation_Schedule_of1

Stock Compensation - Schedule of Stock Option Transactions (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014
2000 Stock Option Plan [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Number of Shares, Outstanding, Beginning Balance	913	1,323	913	1,323	'
Number of Shares, Issued	'	'	78	15	'
Number of Shares, Exercised	'	'	78	94	'
Number of Shares, Forfeited	'	'	'	17	'
Number of Shares, Outstanding, Ending Balance	'	'	913	1,227	'
Number of Shares, Exercisable and vested at end of period	'	'	835	836	'
Number of Shares, Unvested at end of period	'	'	78	391	428
Number of Shares, Vested and expected to vest at end of period	'	'	901	1,167	'
Weighted Average Exercise Price, Outstanding, Beginning Balance	$9.48	$8.10	$9.48	$8.10	'
Weighted Average Exercise Price, Issued	'	'	$15.74	$13.64	'
Weighted Average Exercise Price, Exercised	'	'	$7.36	$7.77	'
Weighted Average Exercise Price, Forfeited	'	'	'	$10.77	'
Weighted Average Exercise Price, Outstanding, Ending Balance	'	'	$10.20	$8.19	'
Weighted Average Exercise Price, Exercisable and vested at end of period	'	'	$9.67	$6.80	'
Weighted Average Exercise Price, Unvested at end of period	'	'	$15.74	$11.16	'
Weighted Average Exercise Price, Vested and expected to vest at end of period	'	'	$10.12	$8.03	'
Weighted Average Exercise Price, Fair value of options granted during the period	'	'	$6.76	'	'
Weighted Average Remaining Contractual Term	'4 years 1 month 6 days	'4 years	'4 years 3 months 18 days	'3 years 8 months 12 days	'
Weighted Average Remaining Contractual Term, Exercisable and vested at end of period	'	'	'3 years 9 months 18 days	'2 years 1 month 6 days	'
Weighted Average Remaining Contractual Term, Unvested at end of period	'	'	'9 years 10 months 24 days	'7 years 1 month 6 days	'
Weighted Average Remaining Contractual Term, Vested and expected to vest at end of period	'	'	'7 years 8 months 12 days	'3 years 6 months	'
2013 Stock Option Plan [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Number of Shares, Outstanding, Beginning Balance	1,911	'	1,911	'	'
Number of Shares, Issued	'	'	'	'	'
Number of Shares, Exercised	'	'	'	'	'
Number of Shares, Forfeited	'	'	'	'	'
Number of Shares, Outstanding, Ending Balance	'	'	1,911	'	'
Number of Shares, Exercisable and vested at end of period	'	'	408	'	'
Number of Shares, Unvested at end of period	'	'	1,503	'	1,911
Number of Shares, Vested and expected to vest at end of period	'	'	1,881	'	'
Number of Shares, Fair value of options granted during the period	'	'	'	'	'
Weighted Average Exercise Price, Outstanding, Beginning Balance	$13.64	'	$13.64	'	'
Weighted Average Exercise Price, Exercised	'	'	'	'	'
Weighted Average Exercise Price, Forfeited	'	'	'	'	'
Weighted Average Exercise Price, Outstanding, Ending Balance	'	'	$13.64	'	'
Weighted Average Exercise Price, Exercisable and vested at end of period	'	'	$13.64	'	'
Weighted Average Exercise Price, Unvested at end of period	'	'	$13.64	'	'
Weighted Average Exercise Price, Vested and expected to vest at end of period	'	'	$13.64	'	'
Weighted Average Exercise Price, Fair value of options granted during the period	'	'	'	'	'
Weighted Average Remaining Contractual Term	'9 years 5 months 1 day	'	'8 years 11 months 1 day	'	'
Weighted Average Remaining Contractual Term, Exercisable and vested at end of period	'	'	'8 years 11 months 1 day	'	'
Weighted Average Remaining Contractual Term, Unvested at end of period	'	'	'8 years 11 months 1 day	'	'
Weighted Average Remaining Contractual Term, Vested and expected to vest at end of period	'	'	'8 years 11 months 1 day	'	'
Weighted Average Remaining Contractual Term, Fair value of options granted during the period	'	'	'0 years	'	'
Equity Classified [Member] | 2013 Stock Option Plan [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Number of Shares, Issued	'	'	'	'	'
Weighted Average Exercise Price, Issued	'	'	'	'	'
Liability Classified [Member] | 2013 Stock Option Plan [Member]	'	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Number of Shares, Issued	'	'	'	'	'
Weighted Average Exercise Price, Issued	'	'	'	'	'

Stock_Compensation_Summary_of_

Stock Compensation - Summary of Nonvested Stock Option Grants (Detail) (USD $)	6 Months Ended			0 Months Ended	6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 06, 2014	Sep. 30, 2014
	2000 Stock Option Plan [Member]	2000 Stock Option Plan [Member]	2013 Stock Option Plan [Member]	Non Employee Director Compensation Plan [Member]	Non Employee Director Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Weighted Average Grant Date Fair Value, Unvested at beginning of period	$5.82	'	$6.22	'	'
Number of Shares, Unvested at beginning of period	428	'	1,911	'	'
Weighted Average Grant Date Fair Value, Granted	$6.76	'	'	'	'
Weighted Average Grant Date Fair Value, Vested	$5.82	'	$13.64	'	'
Weighted Average Grant Date Fair Value, Forfeited	'	'	'	'	'
Weighted Average Grant Date Fair Value, Unvested at end of period	$6.76	'	$3.64	'	'
Number of Shares, Unvested at beginning of period	'	'	'	'	'
Number of Shares, Granted	78	15	'	'	48
Number of Shares, Vested	428	'	408	'	'
Number of Shares, Forfeited	'	'	'	'	'
Number of Shares, Unvested at end of period	78	391	1,503	'	48
Weighted Average Grant Date Fair Value, Unvested at beginning of period	'	'	'	'	'
Weighted Average Grant Date Fair Value, Granted	'	'	'	$18.88	$18.88
Weighted Average Grant Date Fair Value, Vested	'	'	'	'	'
Weighted Average Grant Date Fair Value, Forfeited	'	'	'	'	'
Weighted Average Grant Date Fair Value, Unvested at end of period	'	'	'	'	'

Stock_Compensation_Summary_of_1

Stock Compensation - Summary of Unvested Restricted Stock Grants (Detail) (Restricted Stock [Member], USD $)	6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014
Restricted Stock [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Number of Shares, Unvested at beginning of period	311
Number of Shares, Granted	'
Number of Shares, Vested	118
Number of Shares, Forfeited	3
Number of Shares, Unvested at end of period	190
Weighted Average Grant Date Fair Value, Unvested at beginning of period	$12.40
Weighted Average Grant Date Fair Value, Granted	'
Weighted Average Grant Date Fair Value, Vested	$12.06
Weighted Average Grant Date Fair Value, Forfeited	$10.66
Weighted Average Grant Date Fair Value, Unvested at end of period	$12.60

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail)	6 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2015
			Fiscal Year 2015 [Member]
Income Tax [Line Items]	'	'	'
Effective income tax rate	38.40%	40.10%	38.40%
Federal statutory rate	35.00%	'	'

Net_Income_Per_Share_Summary_o

Net Income Per Share - Summary of Net Income Per Share (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
NET INCOME PER SHARE-BASIC:	'	'	'	'
Net income attributable to ADS	$22,390	$17,322	$36,631	$33,618
Change in fair value of Redeemable Convertible Preferred Stock	7,319	-3,186	-11,054	-4,764
Dividends to Redeemable Convertible Preferred Stockholders	-37	-214	-75	-430
Dividends paid to unvested restricted stockholders	'	-8	'	-16
Net income available to common stockholders and participating securities	29,672	13,914	25,502	28,408
Undistributed income allocated to participating securities	-3,404	-1,536	-3,040	-3,124
Net income available to common stockholders - Basic	26,268	12,378	22,462	25,284
Weighted average number of common shares outstanding - Basic	51,518	47,250	49,538	47,220
Net income per common share - Basic	$0.51	$0.26	$0.45	$0.54
NET INCOME PER SHARE-DILUTED:	'	'	'	'
Net income available to common stockholders - Basic	26,268	12,378	22,462	25,284
Undistributed income allocated to participating securities	2,401	'	1,073	'
Net income available to common stockholders - Diluted	$28,669	$12,378	$23,535	$25,284
Weighted average number of common shares outstanding - Basic	51,518	47,250	49,538	47,220
Assumed conversion of preferred stock	4,714	'	2,382	'
Assumed exercise of stock options	231	329	278	414
Weighted average number of common shares outstanding - Diluted	56,463	47,579	52,198	47,634
Net income per common share - Diluted	$0.51	$0.26	$0.45	$0.53
Potentially dilutive securities excluded as anti-dilutive	22	38	57	63

Business_Segments_Information_1

Business Segments Information - Additional Information (Detail)	6 Months Ended
	Sep. 30, 2014
	Segment
Segment Reporting [Abstract]	'
Number of reportable segments	2
Number of operating segments	2

Business_Segments_Information_2

Business Segments Information - Schedule of Reportable Segment (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]	'	'	'	'
Total net sales	$364,724	$333,240	$693,021	$626,342
Domestic Segment [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Total net sales	319,642	296,072	611,124	551,661
Domestic Segment [Member] | Pipe [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Total net sales	241,872	224,064	459,179	413,206
Domestic Segment [Member] | Allied Products [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Total net sales	77,770	72,008	151,945	138,455
International Segment [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Total net sales	45,082	37,168	81,897	74,681
International Segment [Member] | Pipe [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Total net sales	36,422	30,062	66,359	59,649
International Segment [Member] | Allied Products [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Total net sales	$8,660	$7,106	$15,538	$15,032

Business_Segments_Information_3

Business Segments Information - Schedule of Additional Financial Information Attributable to Reportable Segments (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014
Segment Reporting Information [Line Items]	'	'	'	'	'
Net sales	$364,724	$333,240	$693,021	$626,342	'
Gross profit	82,442	73,219	154,475	139,222	'
Segment Adjusted EBITDA	60,458	51,567	109,663	101,109	'
Interest expense, net	4,338	3,866	8,953	7,967	'
Capital expenditures	8,193	8,558	15,643	21,700	'
Depreciation and amortization	13,783	13,887	27,486	27,988	'
Equity in net income (loss) of unconsolidated affiliates	-2	-97	-623	-345	'
Investment in unconsolidated affiliates	30,113	'	30,113	'	25,231
Total identifiable assets	1,018,224	'	1,018,224	'	937,595
Intersegment Eliminations [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total identifiable assets	-15,458	'	-15,458	'	-13,308
Domestic Segment [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net sales	319,642	296,072	611,124	551,661	'
Gross profit	74,572	65,278	139,362	122,830	'
Segment Adjusted EBITDA	56,124	46,802	101,893	91,880	'
Interest expense, net	4,325	3,844	8,938	7,933	'
Capital expenditures	7,898	7,065	14,835	18,003	'
Depreciation and amortization	12,486	12,701	24,952	25,569	'
Equity in net income (loss) of unconsolidated affiliates	251	114	404	114	'
Investment in unconsolidated affiliates	8,623	'	8,623	'	5,202
Domestic Segment [Member] | Operating Segments [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total identifiable assets	908,041	'	908,041	'	835,736
International Segment [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Net sales	45,082	37,168	81,897	74,681	'
Gross profit	7,870	7,941	15,113	16,392	'
Segment Adjusted EBITDA	4,334	4,765	7,770	9,229	'
Interest expense, net	13	22	15	34	'
Capital expenditures	295	1,493	808	3,697	'
Depreciation and amortization	1,297	1,186	2,534	2,419	'
Equity in net income (loss) of unconsolidated affiliates	-253	-211	-1,027	-459	'
Investment in unconsolidated affiliates	21,490	'	21,490	'	20,029
International Segment [Member] | Operating Segments [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total identifiable assets	$125,641	'	$125,641	'	$115,167

Business_Segments_Information_4

Business Segments Information - Schedule of Reconciliation of Segment EBITDA and Segment Adjusted EBITDA to Net Income (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]	'	'	'	'
Net income attributable to ADS	$22,390	$17,322	$36,631	$33,618
Depreciation and amortization	13,783	13,887	27,486	27,988
Interest expense, net	4,338	3,866	8,953	7,967
Income tax expense	14,062	12,242	23,757	23,308
Derivative fair value adjustments	-67	-319	-163	-238
ESOP deferred compensation	2,687	2,506	5,374	5,026
Segment Adjusted EBITDA	60,458	51,567	109,663	101,109
Tigre ADS, BaySaver and Tigre ADS-USA joint ventures [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Depreciation and amortization	646	334	1,272	677
Domestic Segment [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Net income attributable to ADS	20,612	15,218	34,054	29,675
Depreciation and amortization	12,486	12,701	24,952	25,569
Interest expense, net	4,325	3,844	8,938	7,933
Income tax expense	13,525	11,449	22,741	21,895
Segment EBITDA	51,186	43,213	91,131	85,074
Derivative fair value adjustments	67	319	163	238
Foreign currency transaction losses	'	'	'	'
Unconsolidated affiliates interest and tax	53	'	94	'
Management fee to minority interest holder JV	'	'	'	'
Share-based compensation	2,131	764	4,416	1,424
ESOP deferred compensation	2,687	2,506	5,374	5,026
Transaction costs	'	'	'	118
Segment Adjusted EBITDA	56,124	46,802	101,893	91,880
Domestic Segment [Member] | Tigre ADS, BaySaver and Tigre ADS-USA joint ventures [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Depreciation and amortization	12,724	12,702	25,398	25,571
International Segment [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Net income attributable to ADS	1,778	2,104	2,577	3,943
Depreciation and amortization	1,297	1,186	2,534	2,419
Interest expense, net	13	22	15	34
Income tax expense	537	793	1,016	1,413
Segment EBITDA	4,033	4,438	6,968	8,484
Derivative fair value adjustments	'	'	'	'
Foreign currency transaction losses	-205	-181	-75	-87
Unconsolidated affiliates interest and tax	183	98	319	228
Management fee to minority interest holder JV	323	410	558	604
Share-based compensation	'	'	'	'
ESOP deferred compensation	'	'	'	'
Transaction costs	'	'	'	'
Segment Adjusted EBITDA	4,334	4,765	7,770	9,229
International Segment [Member] | Tigre ADS, BaySaver and Tigre ADS-USA joint ventures [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Depreciation and amortization	$1,705	$1,519	$3,360	$3,094

Business_Segments_Information_5

Business Segments Information - Schedule of Reconciliation of Segment EBITDA and Segment Adjusted EBITDA to Net Income (Parenthetical) (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]	'	'	'	'
Depreciation and amortization	$13,783	$13,887	$27,486	$27,988
Tigre ADS, BaySaver and Tigre ADS-USA joint ventures [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Depreciation and amortization	$646	$334	$1,272	$677