Advanced Drainage Systems (WMS) 10-K 30 May 18 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	May 21, 2018	Sep. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Trading Symbol	WMS
Entity Registrant Name	ADVANCED DRAINAGE SYSTEMS, INC.
Entity Central Index Key	1,604,028
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		56,562,490
Entity Public Float			$ 899

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Current assets:
Cash	$ 17,587	$ 6,450
Receivables (less allowance for doubtful accounts of $6,826 and $10,431, respectively)	171,961	168,943
Inventories	263,792	258,430
Other current assets	5,113	6,743
Total current assets	458,453	440,566
Property, plant and equipment, net	399,381	406,858
Other assets:
Goodwill	103,017	100,566
Intangible assets, net	44,437	51,758
Other assets	37,954	46,537
Total assets	1,043,242	1,046,285
Current liabilities:
Current maturities of debt obligations	26,848	37,789
Current maturities of capital lease obligations	22,007	21,450
Accounts payable	105,521	121,922
Other accrued liabilities	60,560	66,386
Accrued income taxes	6,307	8,207
Total current liabilities	221,243	255,754
Long-term debt obligation (less unamortized debt issuance costs of $3,028 and $1,723, respectively)	270,900	310,849
Long-term capital lease obligations	59,963	58,710
Deferred tax liabilities	32,304	44,007
Other liabilities	25,023	26,530
Total liabilities	609,433	695,850
Commitments and contingencies (see Note 14)
Mezzanine equity:
Redeemable convertible preferred stock: $0.01 par value; 47,070 shares authorized; 44,170 shares issued; 23,300 and 24,225 shares outstanding, respectively	291,247	302,814
Deferred compensation — unearned ESOP shares	(190,168)	(198,216)
Redeemable noncontrolling interest in subsidiaries	8,471	8,227
Total mezzanine equity	109,550	112,825
Stockholders’ equity:
Common stock: $0.01 par value; 1,000,000 shares authorized; 56,889 shares issued; 56,476 and 55,338 shares outstanding, respectively	11,426	12,393
Paid-in capital	364,908	755,787
Common stock in treasury, at cost	(8,277)	(436,984)
Accumulated other comprehensive loss	(21,247)	(24,815)
Retained deficit	(39,214)	(83,678)
Total ADS stockholders’ equity	307,596	222,703
Noncontrolling interest in subsidiaries	16,663	14,907
Total stockholders’ equity	324,259	237,610
Total liabilities, mezzanine equity and stockholders’ equity	$ 1,043,242	$ 1,046,285

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Allowance for doubtful accounts	$ 6,826	$ 10,431
Unamortized debt issuance costs	$ 3,028	$ 1,723
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	56,889,000	56,889,000
Common stock, shares outstanding	56,476,000	55,338,000
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	23,300,000	24,225,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 1,330,354	$ 1,257,261	$ 1,290,678
Cost of goods sold	1,027,873	961,451	1,005,326
Gross profit	302,481	295,810	285,352
Operating expenses:
Selling	92,764	91,475	88,478
General and administrative	98,392	110,950	92,504
Loss on disposal of assets and costs from exit and disposal activities	15,003	8,509	812
Intangible amortization	8,068	8,548	9,224
Income from operations	88,254	76,328	94,334
Other expense:
Interest expense	15,262	17,467	18,460
Derivative (gains) losses and other (income) expense, net	(3,950)	(5,970)	16,575
Income before income taxes	76,942	64,831	59,299
Income tax expense	11,411	24,615	23,498
Equity in net loss of unconsolidated affiliates	739	4,308	5,234
Net income	64,792	35,908	30,567
Less: net income attributable to noncontrolling interest	2,785	2,958	5,515
Net income attributable to ADS	$ 62,007	$ 32,950	$ 25,052
Weighted average common shares outstanding:
Basic	55,696	54,919	53,978
Diluted	56,334	55,624	55,176
Net income per share available to common stockholders:
Basic	$ 1	$ 0.51	$ 0.40
Diluted	0.99	0.50	0.39
Cash dividends declared per share	$ 0.28	$ 0.24	$ 0.20

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 64,792	$ 35,908	$ 30,567
Other comprehensive income (loss):
Currency translation	3,886	(5,037)	(8,594)
Comprehensive income	68,678	30,871	21,973
Less: other comprehensive (gain) loss attributable to noncontrolling interest, net of tax	318	(1,483)	(2,854)
Less: net income attributable to noncontrolling interest	2,785	2,958	5,515
Total comprehensive income attributable to ADS	$ 65,575	$ 29,396	$ 19,312

Consolidated Statement of Cash

Consolidated Statement of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities
Net income	$ 64,792	$ 35,908	$ 30,567
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	75,003	72,355	71,009
Deferred income taxes	(11,239)	(8,971)	10,686
Loss on disposal of assets and costs from exit and disposal activities	12,655	7,316	812
ESOP, stock repurchase agreement and stock-based compensation	18,845	17,875	4,382
Amortization of deferred financing charges	934	1,408	1,412
Fair market value adjustments to derivatives	(3,244)	(10,921)	2,163
Loss on purchase of non-controlling interest			490
Equity in net loss of unconsolidated affiliates	739	4,308	5,234
Gain on bargain purchase of PTI acquisition		(609)
Other operating activities	1,010	(5,871)	7,243
Changes in working capital:
Receivables	(4,327)	15,055	(37,788)
Inventories	(4,841)	(27,917)	28,330
Prepaid expenses and other current assets	1,648	(2,548)	646
Accounts payable, accrued expenses and other liabilities	(14,855)	6,851	10,156
Net cash provided by operating activities	137,120	104,239	135,342
Cash Flows from Investing Activities
Capital expenditures	(41,709)	(46,676)	(44,942)
Cash paid for acquisitions, net of cash acquired	(1,990)	(8,573)	(3,188)
Purchase of property, plant and equipment through financing		(4,620)
Proceeds from note receivable to related party			3,854
Issuance of note receivable to related party			(3,854)
Proceeds from sale of corporate-owned life insurance	13,644
Other investing activities	(390)	(1,390)	(888)
Net cash used in investing activities	(30,445)	(61,259)	(49,018)
Cash Flows from Financing Activities
Proceeds from Revolving Credit Facility	487,850	412,400	409,100
Payments on Revolving Credit Facility	(512,150)	(382,600)	(448,200)
Payments on Term Loan	(72,500)	(10,000)	(8,750)
Proceeds from Senior Notes	75,000
Payments on Senior Notes	(25,000)	(25,000)
Proceeds from notes, mortgages, and other debt		1,000	6,378
Payments of notes, mortgages, and other debt	(1,905)	(870)	(7,208)
Payments on loans against corporate-owned life insurance		(6,823)
Equipment financing loans		4,620
Debt issuance costs	(2,268)
Payments on capital lease obligations	(24,214)	(21,760)	(19,780)
Cash dividends paid	(18,478)	(16,820)	(16,240)
Proceeds from option exercises	9,087	4,011	1,765
Repurchase of common stock	(7,947)
Other financing activities	(2,428)	(983)	(29)
Net cash used in financing activities	(94,953)	(42,825)	(82,964)
Effect of exchange rate changes on cash	(585)	(260)	(428)
Net change in cash	11,137	(105)	2,932
Cash at beginning of year	6,450	6,555	3,623
Cash at end of year	$ 17,587	$ 6,450	$ 6,555

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Paid-In Capital [Member]	Common Stock in Treasury [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings (Deficit) [Member]	Total ADS Stockholders' Equity [Member]	Non-controlling Interest in Subsidiaries [Member]
Beginning Balance, Value at Mar. 31, 2015	$ 177,125	$ 12,393	$ 723,495	$ (445,065)	$ (15,521)	$ (114,590)	$ 160,712	$ 16,413
Beginning Balance, Shares at Mar. 31, 2015		153,560		100,038
Net income	30,132					25,052	25,052	5,080
Other comprehensive loss	(8,594)				(5,740)		(5,740)	(2,854)
Redeemable convertible preferred stock dividends	(1,293)					(1,293)	(1,293)
Common stock dividend	(10,815)					(10,815)	(10,815)
Dividend paid to noncontrolling interest holder	(3,606)							(3,606)
Compensation	3,577		3,577				3,577
Dividend	(132)					(132)	(132)
Exercise of common stock options	5,333		4,379	$ 954			5,333
Exercise of common stock options, Shares				(215)
Restricted stock awards	891		582	$ 309			891
Restricted stock awards, Shares				(69)
Tax benefit resulting from exercise of certain stock-based compensation awards	194		194				194
ESOP distributions in common stock	10,250		7,443	$ 2,807			10,250
ESOP distributions in common stock, Shares				(631)
Accretion of redeemable noncontrolling interest	(573)		(573)				(573)
Ending Balance, Value at Mar. 31, 2016	202,489	$ 12,393	739,097	$ (440,995)	(21,261)	(101,778)	187,456	15,033
Ending Balance, Shares at Mar. 31, 2016		153,560		99,123
Net income	35,186					32,950	32,950	2,236
Other comprehensive loss	(5,037)				(3,554)		(3,554)	(1,483)
Redeemable convertible preferred stock dividends	(1,512)					(1,512)	(1,512)
Common stock dividend	(13,204)					(13,204)	(13,204)
Dividend paid to noncontrolling interest holder	(879)							(879)
Compensation	2,254		2,254				2,254
Dividend	(134)					(134)	(134)
Exercise of common stock options	8,166		6,571	$ 1,595			8,166
Exercise of common stock options, Shares				(358)
Restricted stock awards	3,309		2,926	$ 383			3,309
Restricted stock awards, Shares				(86)
Equity classified stock-based compensation expense before related tax effects	139		139				139
Tax benefit resulting from exercise of certain stock-based compensation awards	439		439				439
Reclassification of liability-classified awards	220		220				220
ESOP distributions in common stock	7,426		5,393	$ 2,033			7,426
ESOP distributions in common stock, Shares				(457)
Accretion of redeemable noncontrolling interest	(1,252)		(1,252)				(1,252)
Ending Balance, Value at Mar. 31, 2017	237,610	$ 12,393	755,787	$ (436,984)	(24,815)	(83,678)	222,703	14,907
Ending Balance, Shares at Mar. 31, 2017		153,560		98,222
Net income	63,935					62,007	62,007	1,928
Other comprehensive loss	3,886				3,568		3,568	318
Redeemable convertible preferred stock dividends	(1,724)					(1,724)	(1,724)
Common stock dividend	(15,685)					(15,685)	(15,685)
Dividend paid to noncontrolling interest holder	(490)							(490)
Compensation	3,809		3,809				3,809
Dividend	(134)					(134)	(134)
Exercise of common stock options	9,087	$ 7	9,161	$ (81)			9,087
Exercise of common stock options, Shares		666		2
Restricted stock awards	2,818	$ 1	2,664	$ 153			2,818
Restricted stock awards, Shares		90		(72)
Equity classified stock-based compensation expense before related tax effects	4,148		4,148				4,148
Reclassification of liability-classified awards	13,714		13,714				13,714
ESOP distributions in common stock	11,566	$ 2	9,811	$ 1,753			11,566
ESOP distributions in common stock, Shares		318		(394)
Retirement of common stock held in treasury		$ (977)	(433,852)	$ 434,829
Retirement of common stock held in treasury, Shares		(97,745)		(97,745)
Common stock repurchases	(7,947)	$ (7,900)		$ (7,947)			(7,947)
Common stock repurchases, Shares		(400)		400
Accretion of redeemable noncontrolling interest	(334)		(334)				(334)
Ending Balance, Value at Mar. 31, 2018	$ 324,259	$ 11,426	$ 364,908	$ (8,277)	$ (21,247)	$ (39,214)	$ 307,596	$ 16,663
Ending Balance, Shares at Mar. 31, 2018		56,889		413

Consolidated Statements of Sto8

Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) - $ / shares	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Statement Of Stockholders Equity [Abstract]
Common stock dividend per share	$ 0.28	$ 0.24	$ 0.20

Consolidated Statements of Mezz

Consolidated Statements of Mezzanine Equity - USD ($) shares in Thousands, $ in Thousands	Total	Redeemable Non-controlling Interest [Member]	Redeemable Convertible Preferred Stock [Member]	Deferred Compensation - Unearned ESOP Shares [Member]	Total Mezzanine Equity [Member]
Beginning Balance, Value at Mar. 31, 2015			$ 320,490	$ (212,469)	$ 108,021
Beginning Balance, Shares at Mar. 31, 2015			25,639	16,990
Net income		$ 435			435
Redeemable convertible preferred stock dividends	$ (1,293)
Common stock dividend	(10,815)
Dividend paid to noncontrolling interest holder	(3,606)	(526)			(526)
Compensation	3,577			$ 6,673	6,673
Compensation, Shares				(534)
Dividend	132			$ 132	132
Dividend, Shares				(8)
Exercise of common stock options	5,333
Restricted stock awards	891
Tax benefit resulting from exercise of certain stock-based compensation awards	194
ESOP distributions in common stock			$ (10,250)		(10,250)
ESOP distribution in common stock, Shares			(820)
Acquisition of redeemable noncontrolling interest		6,330			6,330
Accretion of redeemable noncontrolling interest	573	932			932
Ending Balance, Value at Mar. 31, 2016		7,171	$ 310,240	$ (205,664)	111,747
Ending Balance, Shares at Mar. 31, 2016			24,819	16,448
Net income		722			722
Redeemable convertible preferred stock dividends	(1,512)
Common stock dividend	(13,204)
Dividend paid to noncontrolling interest holder	(879)	(1,226)			(1,226)
Compensation	2,254			$ 7,314	7,314
Compensation, Shares				(585)
Dividend	134			$ 134	134
Exercise of common stock options	8,166
Restricted stock awards	3,309
Equity classified stock-based compensation expense before related tax effects	139
Tax benefit resulting from exercise of certain stock-based compensation awards	439
Reclassification of liability-classified awards	220
ESOP distributions in common stock			$ (7,426)		(7,426)
ESOP distribution in common stock, Shares			(594)
Accretion of redeemable noncontrolling interest	1,252
Accretion of redeemable noncontrolling interest		1,560			1,560
Ending Balance, Value at Mar. 31, 2017	112,825	8,227	$ 302,814	$ (198,216)	112,825
Ending Balance, Shares at Mar. 31, 2017			24,225	15,863
Net income		857			857
Redeemable convertible preferred stock dividends	(1,724)
Common stock dividend	(15,685)
Dividend paid to noncontrolling interest holder	(490)	(613)			(613)
Compensation	3,809			$ 8,048	8,048
Compensation, Shares				(644)
Dividend	134
Exercise of common stock options	9,087
Restricted stock awards	2,818
Equity classified stock-based compensation expense before related tax effects	4,148
Reclassification of liability-classified awards	13,714
ESOP distributions in common stock			$ (11,567)		(11,567)
ESOP distribution in common stock, Shares			(925)
Accretion of redeemable noncontrolling interest	334
Ending Balance, Value at Mar. 31, 2018	$ 109,550	$ 8,471	$ 291,247	$ (190,168)	$ 109,550
Ending Balance, Shares at Mar. 31, 2018			23,300	15,219

Background and Summary of Signi

Background and Summary of Significant Accounting Policies	12 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Background and Summary of Significant Accounting Policies	1. BACKGROUND AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Description of Business - Advanced Drainage Systems, Inc. and subsidiaries (collectively referred to as “ADS” and the “Company”), 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. ADS’s broad product line includes corrugated high density polyethylene (or “HDPE”) pipe, polypropylene (or “PP”) pipe and related water management products. The Company’s fiscal year begins on April 1 and ends on March 31. Unless otherwise noted, references to “year” pertain to our fiscal year. For example, 2018 refers to fiscal 2018, which is the period from April 1, 2017 to March 31, 2018. 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. Principles of Consolidation - The consolidated financial statements include the Company, its wholly owned subsidiaries, its majority owned subsidiaries, and variable interest entities (“VIEs”) of which the Company is the primary beneficiary. The Company uses the equity method of accounting for equity investments where it exercises significant influence but does not hold a controlling financial interest. Such investments are recorded in Other assets in the Consolidated Balance Sheets and the related equity in earnings from these investments are included in Equity in net loss of unconsolidated affiliates in the Consolidated Statements of Operations. All intercompany balances and transactions have been eliminated in consolidation. Estimates - The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingencies and liabilities at the balance sheet date and the reported amounts of revenues and expenses during the reporting period. Significant estimates include, but are not limited to, the allowance for doubtful accounts, valuation of inventory, useful lives of property, plant and equipment and amortizing intangible assets, determination of the proper accounting for leases, valuation of equity method investments, goodwill, intangible assets and other long-lived assets for impairment, accounting for stock-based compensation and the ESOP, valuation of the redeemable convertible preferred stock, determination of allowances for sales returns, rebates and discounts, determination of the valuation allowance, if any, on deferred tax assets, and reserves for uncertain tax positions. 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. Receivables and Allowance for Doubtful Accounts - Receivables include trade receivables, net of an allowance for doubtful accounts, and other miscellaneous receivables. Receivables at March 31, 2018 and 2017 are as follows: (Amounts in thousands) 2018 2017 Trade receivables $ 159,291 $ 160,655 Other miscellaneous receivables 12,670 8,288 Receivables $ 171,961 $ 168,943 As of March 31, 2018 and 2017, Other miscellaneous receivables includes an insurance recoverable of approximately $3.4 million and $2.4 million, respectively, which has a corresponding liability recorded in Other accrued liabilities. Credit is extended to customers based on an evaluation of their financial condition and collateral is generally not required. The evaluation of the customer’s financial condition is performed to reduce the risk of loss. Accounts receivable are evaluated for collectability based on numerous factors, including the length of time individual receivables are past due, past transaction history with customers, their credit worthiness and the economic environment. This estimate is periodically adjusted when management becomes aware of a specific customer’s inability to meet its financial obligations (e.g., bankruptcy filing) or as a result of changes in historical collection patterns. Inventories - Inventories are stated at the lower of cost or net realizable value. The Company’s inventories are maintained on the first-in, first-out (“FIFO”) method. Costs include the cost of acquiring materials, including in-bound freight from vendors and freight incurred for the transportation of raw materials, tooling or finished goods between the Company’s manufacturing plants and its distribution centers, direct and indirect labor, factory overhead and certain corporate overhead costs related to the production of inventory. The portion of fixed manufacturing overhead that relates to capacity in excess of our normal capacity is expensed in the period in which it is incurred and is not included in inventory. Net realizable value of inventory is established with consideration given to deterioration, obsolescence, and other factors. The Company periodically evaluates the carrying value of inventories and adjustments are made whenever necessary to reduce the carrying value to net realizable value. Property, Plant and Equipment and Depreciation Method - Property, plant and equipment are recorded at cost less accumulated depreciation, with the exception of assets acquired through acquisitions, which are initially recorded at fair value. Equipment acquired under capital lease is recorded at the lower of fair market value or the present value of the future minimum lease payments. Depreciation is computed for financial reporting purposes using the straight-line method over the estimated useful lives of the related assets or the lease term, if shorter, as follows: Years Buildings and leasehold improvement 20 — 45 or the lease term if shorter Machinery and equipment 3 — 18 Costs of additions and major improvements are capitalized, whereas maintenance and repairs that do not improve or extend the life of the asset are charged to expense as incurred. When assets are retired or disposed, the cost and related accumulated depreciation are removed from the asset accounts and any resulting gain or loss is reflected in Loss on disposal of assets and costs from exit and disposal activities in our Consolidated Statements of Operations. Construction in progress is also recorded at cost and includes capitalized interest, capitalized payroll costs and related costs such as taxes and other fringe benefits. Interest capitalized was $0.6 million, $0.6 million, and $0.4 million during the fiscal years ended March 31, 2018, 2017, and 2016, respectively. Goodwill - The Company records acquisitions resulting in the consolidation of an enterprise using the acquisition method of accounting. Under this method, the Company records the assets acquired, including intangible assets that can be identified, and liabilities assumed based on their estimated fair values at the date of acquisition. The purchase price in excess of the fair value of the identifiable assets acquired and liabilities assumed is recorded as goodwill. Goodwill is reviewed annually for impairment as of March 31 or whenever events or changes in circumstances indicate the carrying value may be greater than fair value. The goodwill impairment analysis is comprised of two steps. The first step requires the comparison of the fair value of the applicable reporting unit to its respective carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that unit, goodwill is not considered impaired and the Company is not required to perform further testing. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, then the Company must perform the second step of the impairment test in order to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then the Company would record an impairment loss equal to the difference. With respect to this testing, a reporting unit is a component of the Company for which discrete financial information is available and regularly reviewed by management. Implied fair value of goodwill is determined by considering both the income and market approach. Determining the fair value of a reporting unit is judgmental in nature and involves the use of significant estimates and assumptions. These estimates and assumptions include revenue growth rates and operating margins used to calculate projected future cash flows, risk-adjusted discount rates, future economic and market conditions, and determination of appropriate market comparables. The fair value estimates are based on assumptions management believes to be reasonable, but are inherently uncertain. For the fiscal 2018, ADS completed a quantitative fair value assessment of the International reporting unit and determined no impairment charge was required. GAAP allows entities testing goodwill for impairment the option of performing a qualitative assessment before calculating the fair value of a reporting unit for the goodwill impairment test. If the qualitative assessment is performed, an entity is no longer required to calculate the fair value of a reporting unit unless the entity determines that, based on that assessment, it is more likely than not that its fair value is less than its carrying amount. ADS completed a quantitative fair value measurement of the Domestic reporting unit in fiscal 2016. The test indicated that the fair value of the Domestic reporting unit exceeded the carrying value, indicating that no impairment existed. ADS applied the qualitative assessment to the Domestic reporting unit for the annual impairment test performed as of March 31, 2018 and 2017. For the current year test, ADS assessed various assumptions, events and circumstances that would have affected the estimated fair value of the reporting unit as compared to its March 31, 2016 quantitative fair value measurement. The results of this assessment indicated that it is not more likely than not that the reporting unit fair value is less than the reporting unit carrying value. The Company did not incur any impairment charges for goodwill in the fiscal years ended March 31, 2018, 2017, and 2016. Intangible Assets Intangible Assets — Definite-Lived - Definite-lived intangible assets are amortized using the straight-line method over their estimated useful lives, and are tested for recoverability whenever events or changes in circumstances indicate that carrying amounts of the asset group may not be recoverable. Asset groups are established primarily by determining the lowest level of cash flows available. If the estimated undiscounted future cash flows are less than the carrying amounts of such assets, an impairment loss is recognized to the extent the fair value of the asset less any costs of disposition is less than the carrying amount of the asset. Determining the fair value of these assets is judgmental in nature and involves the use of significant estimates and assumptions. Intangible Assets — Indefinite-Lived - 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. Determining the fair value of these assets is judgmental in nature and involves the use of significant estimates and assumptions. The Company bases its fair value estimates on assumptions it believes to be reasonable, but that are inherently uncertain. To estimate the fair value of these indefinite-lived intangible assets, the Company uses an income approach, which utilizes a market derived rate of return to discount anticipated performance. An impairment loss is recognized when the estimated fair value of the intangible asset is less than the carrying value. GAAP allows entities testing indefinite-lived intangible assets for impairment the option of performing a qualitative assessment before calculating the fair value of the indefinite-lived intangible assets for the impairment test. If the qualitative assessment is performed, an entity is no longer required to calculate the fair value of an indefinite-lived intangible assets unless the entity determines that, based on that assessment, it is more likely than not that its fair value is less than its carrying amount. ADS completed a quantitative fair value measurement of indefinite-lived trademarks in March 31, 2016. The test indicated that the fair value of the indefinite-lived trademarks substantially exceeded the carrying value, indicating that no impairment existed. ADS applied the qualitative assessment to specific trademarks for the annual impairment test performed as of March 31, 2018 and 2017. For the current year test, ADS assessed various assumptions, events and circumstances that would have affected the estimated fair value of the reporting unit as compared to its March 31, 2016 quantitative fair value measurement. The results of this assessment indicated that it is not more likely than not that the trademarks fair value is less than the reporting unit carrying value. The Company did not incur any impairment charges for Intangible assets in the fiscal years ended March 31, 2018, 2017, and 2016. Other Assets - Other assets include investments in unconsolidated affiliates accounted for under the equity method, cash surrender value of officer life insurance on key senior management executives, capitalized software development costs, deposits, central parts, and other miscellaneous assets. In the year ended March 31, 2018, the Company discontinued offering the cash surrender value of officer life insurance, and collected proceeds of $13.6 million from the sale of the officer life insurance. The Company capitalizes development costs for internal use software. Capitalization of software development costs begins in the application development stage and ends when the asset is placed into service. The Company amortizes such costs using the straight-line method over estimated useful lives of 2 to 10 years, which is included in General and administrative expense, Selling expense or Cost of goods sold within the Consolidated Statements of Operations depending on the nature of the asset and its intended use. Central parts represent spare production equipment items which are used to replace worn or broken production equipment parts and help reduce the risk of prolonged equipment outages. The cost of central parts is amortized on a straight line basis over estimated useful lives of 5 to 10 years. The Company evaluates its investments in unconsolidated affiliates for impairment whenever events or changes in circumstances indicate that the carrying amount might not be recoverable, and recognizes an impairment loss when a decline in value below carrying value is determined to be other-than-temporary. Under these circumstances, the Company would adjust the investment down to its estimated fair value, which then becomes its new carrying value. For the fiscal years ended March 31, 2017, the Company recorded an impairment charge of $1.3 million related to its investment in the South American Joint Venture. The impairment charge is included in Equity in net loss of unconsolidated affiliates in the Consolidated Statements of Operations. Other assets as of the fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 Investments in unconsolidated affiliates $ 12,343 $ 8,986 Cash surrender value of officer life insurance — 12,028 Capitalized software development costs, net 10,195 7,980 Deposits 2,776 1,289 Central parts 2,089 1,856 Other 10,551 14,398 Total other assets $ 37,954 $ 46,537 The following table sets forth amortization expense related to Other assets in each of the fiscal years ended March 31: (Amounts in thousands) 2018 2017 2016 Capitalized software development costs $ 2,156 $ 3,372 $ 3,872 Central parts 47 54 362 Other 1,688 1,689 1,898 Leases - Leases are reviewed for capital or operating classification at their inception. The Company uses the lower of the rate implicit in the lease or its incremental borrowing rate in the assessment of lease classification and assumes the initial lease term includes cancellable and renewal periods that are reasonably assured. For leases classified as capital leases at lease inception, the Company records a capital lease asset and lease financing obligation equal to the lesser of the present value of the minimum lease payments or the fair market value of the leased asset. The capital lease asset is recorded in Property, plant and equipment, net and amortized to its expected residual value at the end of the lease term using the straight-line method, and the lease financing obligation is amortized using the effective interest method over the lease term with the rental payments being allocated to principal and interest. For leases classified as operating leases, the Company records rent expense over the useful life using the straight-line method. Foreign Currency Translation - Assets and liabilities of foreign subsidiaries with a functional currency other than the U.S. dollar are translated into U.S. dollars at the current rate of exchange on the last day of the reporting period. Revenues and expenses are translated at a monthly average exchange rate and equity transactions are translated using either the actual exchange rate on the day of the transaction or a monthly average historical exchange rate. For the fiscal years ended March 31, 2018, 2017, and 2016, the Company’s Accumulated other comprehensive loss (“AOCL”) consisted of foreign currency translation gains and losses. Net Sales - The Company sells pipe products and related water management products. ADS ships products to customers predominantly by internal fleet and to a lesser extent by third-party carriers. The Company does not provide any additional revenue generating services after product delivery. Sales, net of sales tax and allowances for returns, rebates and discounts are recognized from product sales when persuasive evidence of an arrangement exists, delivery has occurred, the price to the buyer is fixed or determinable and collectability is reasonably assured. ADS recognizes revenue when both persuasive evidence of an arrangement and the price is fixed or determinable. Title to the products and risk of loss generally passes to the customer upon delivery. ADS performs credit check procedures on all new customers, establishes credit limits accordingly, and monitors the creditworthiness of existing customers, which is the basis for concluding that collectability is reasonably assured. Shipping Costs - The Company incurs shipping costs to deliver products to customers using an in-house fleet or common carrier. Typically shipping costs are prepaid and included in the product price; however, in some instances, the Company bills shipping costs to customers. Shipping costs are also incurred to physically move raw materials, tooling and products between manufacturing and distribution facilities. Shipping costs for the fiscal years ended March 31, 2018, 2017, and 2016 were $133.8 million, $120.4 million, and $120.5 million, respectively, and are included in Cost of goods sold. Shipping costs billed to customers were $6.3 million, $5.5 million, and $7.0 million during 2018, 2017 and 2016, respectively, and are included in Net sales. Stock-Based Compensation - See “Note 16. Stock-Based Compensation” for information about our stock-based compensation award programs and related accounting policies. Advertising - The Company expenses advertising costs as incurred. Advertising costs are recorded in Selling expenses in the Consolidated Statements of Operations. The total advertising costs were $4.1 million, $3.1 million, and $3.2 million for the fiscal years ended March 31, 2018, 2017, and 2016, respectively. Self-Insurance - The Company is self-insured for short term disability and medical coverage it provides for substantially all eligible employees. The Company is self-insured for medical claims up to the individual and aggregate stop-loss coverage limits. The Company accrues for claims incurred but not reported based on an estimate of future claims related to events that occurred prior to the fiscal year end if it has not met the aggregate stop-loss coverage limit. Amounts expensed totaled $41.3 million, $39.5 million, and $37.5 million for the fiscal years ended March 31, 2018, 2017, and 2016, respectively, of which employees contributed $5.9 million, $5.1 million, and $4.5 million, respectively. ADS is also self-insured for various other general insurance programs to the extent of the applicable deductible limits on the Company’s insurance coverage. These programs include primarily automobile, general liability and employment practices coverage with a deductible of $0.3 million per occurrence or claim incurred. Amounts expensed during the period, including an estimate for claims incurred but not reported at year end, were $2.2 million, $1.8 million, and $2.1 million, for the years ended March 31, 2018, 2017, and 2016, respectively. ADS is also self-insured for workers’ compensation insurance with stop-loss coverage for claims that exceed $0.5 million per incident up to the respective state statutory limits. Amounts expensed, including an estimate for claims incurred but not reported, were $1.3 million, $2.1 million, and $3.9 million for the fiscal years ended March 31, 2018, 2017, and 2016, respectively. Income Taxes - Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized and represent the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. They are measured using the enacted tax rates expected to apply to taxable income in the years in which the related temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The deferred income tax provision represents the change during the reporting period in the deferred tax assets and deferred tax liabilities. Penalties and interest recorded on income taxes payable are recorded as part of Income tax expense. The Company determines whether an uncertain tax position is more likely than not to be sustained upon examination, including resolution of any related appeals or litigation process, based upon the technical merits of the position. For tax positions meeting the more likely than not threshold, the tax amount recognized in the financial statements is the largest amount of tax benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant taxing authority. Fair Values - The fair value framework requires the categorization of assets and liabilities into three levels based upon assumptions (inputs) used to price the assets or liabilities. Level 1 provides the most reliable measure of fair value, whereas Level 3 generally requires significant management judgment. The three levels are defined as follows: Level 1 — Unadjusted quoted prices in active markets for identical assets and liabilities. Level 2 — Observable inputs other than those included in Level 1. For example, quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in inactive markets. Level 3 — Unobservable inputs reflecting management’s own assumptions about the inputs used in pricing the asset or liability. ADS’s policy for determining when transfers between levels have occurred is to use the actual date of the event or change in circumstances that caused the transfer. Concentrations of Risk - The Company has a large, active customer base of approximately twenty thousand customers with two customers, Ferguson Enterprises and Core and Main, each representing more than 10% of annual net sales. Such customers accounted for 25.4%, 23.5%, and 21.1% of fiscal year 2018, 2017 and 2016 net sales, respectively. The Company’s customer base is diversified across the range of end markets that it serves. Financial instruments that potentially subject the Company to a concentration of credit risk consist principally of Receivables. The Company provides its products to customers based on an evaluation of the customers’ financial condition, generally without requiring collateral. Exposure to losses on Receivables is principally dependent on each customer’s financial condition. The Company performs ongoing credit evaluations of its customers. The Company monitors the exposure for credit losses and maintains allowances for anticipated losses. Concentrations of credit risk with respect to Receivables are limited due to the large number of customers comprising the Company’s customer base and their dispersion across many different geographies. One customer, Ferguson Enterprises, accounted for approximately 17.6% and 15.7% of Receivables at March 31, 2018 and 2017, respectively. Derivatives - The Company recognizes derivative instruments as either assets or liabilities and measure those instruments at fair value. ADS uses interest rate swaps, commodity options in the form of collars and swaps, and foreign currency forward contracts to manage various exposures to interest rate, commodity price, and exchange rate fluctuations. These instruments do not qualify for hedge accounting treatment. For the interest rate swap executed on June 28, 2017, gains and losses resulting from the difference between the spot rate and applicable base rate is recorded in Interest expense. For commodity options in the form of collars and swaps, and foreign currency forward contracts, gains and losses from contract settlements and changes in fair value of the derivative instruments are recognized in Derivative losses (gains) and other expense (income), net in the Consolidated Statements of Operations. The Company’s policy is to present all derivative balances on a gross basis. The Company also has forward purchase agreements in place with certain resin suppliers for virgin polyethylene resin. The agreements specify a fixed amount of virgin resin material to be purchased at a fixed price for a given period of time in quantities the Company will use in the normal course of business, and therefore, qualify as normal purchase contracts. The cost of such resin is recognized in Cost of goods sold in the Consolidated Statements of Operations. Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements Measurement of Inventory — In July 2015, the Financial Accounting Standards Board (“FASB”) issued an accounting standards update (“ASU”) which requires entities to measure most inventory at the lower of cost and net realizable value, simplifying current guidance under which an entity must measure inventory at the lower of cost or market. The determination of market value, under current guidance, is considered unnecessarily complex as there are several potential outcomes based on its definition as replacement cost, net realizable value, or net realizable value less an approximate normal profit margin. Whereas net realizable value, under the update, is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. The Company adopted this standard effective April 1, 2017. The new standard did not have a material impact on the Consolidated Financial Statements. Stock-Based Compensation — In March 2016, the FASB issued an ASU which is intended to simplify certain aspects of the accounting for stock-based compensation. The Company adopted the standard on April 1, 2017. The adoption of the ASU did not have a material impact on the historical Consolidated Financial Statements. This update contains changes to the accounting for excess tax benefits, whereby excess tax benefits will be recognized in the income statement rather than in additional paid-in capital on the balance sheet. This update is expected to result in increased volatility to income tax expense in future periods dependent upon the timing of employee exercises of stock options, the price of the Company's common stock and the vesting of restricted stock awards. In addition, excess tax benefits will now be classified as operating cash flows rather than financing cash flows in the Consolidated Statements of Cash Flows. The amendment also contained potential changes to the accounting for forfeitures, whereby entities could elect to either continue to apply the previous requirement to estimate forfeitures when determining compensation expense, or to alternatively reverse the compensation expense of forfeited awards when they occur. The Company will account for forfeitures as they occur, which may result in expense volatility based on the timing of forfeitures. In addition, the update also modified the net-share settlement liability classification exception for statutory income tax withholdings, whereby the new guidance allows an employer with a statutory income tax withholding obligation to withhold shares with a fair value up to the maximum statutory tax rate in the employee’s applicable jurisdiction. The Company included this provision in awards issued in fiscal 2017 and modified previously issued awards on April 1, 2017. See “Note 16. Stock-Based Compensation” for further information on the modification. Recent Accounting Pronouncements Not Yet Adopted Revenue Recognition — In May 2014, the FASB issued an accounting standards update which amends the guidance for revenue recognition. This amendment contains principles 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. In August 2015, the FASB issued an additional accounting standards update that deferred the effective date of the new revenue standard for public entities to periods beginning after December 15, 2017, with early adoption permitted but not earlier than the original effective date of periods beginning after December 15, 2016. There have also been various additional accounting standards updates issued by the FASB in 2016 that further amend this new revenue standard. The updated standard permits the use of either the retrospective or cumulative effect transition method. The Company will adopt this standard effective April 1, 2018 using the modified retrospective method. The adoption of this standard will result in the Company recording a contract asset for estimated inventory returns. At March 31, 2018, the estimated inventory returns would have resulted in a $0.6 million decrease in Receivables, net and a $0.6 million increase in Other current assets on the Company’s Consolidated Balance Sheets. The adoption of this standard will not cause a material shift in the amount or timing of revenue recognition. Leases — In February 2016, the FASB issued an accounting standards update which amends the guidance for leases. This amendment contains principles that will require an entity to recognize most leases on the balance sheet by recording a right-of-use asset and a lease liability, unless the lease is a short-term lease that has an accounting lease term of twelve months or less. The amendment also contains other changes to the current lease guidance that may result in changes to how entities determine which contractual arrangements qualify as a lease, the accounting for executory costs such as property taxes and insurance, as well as which lease origination costs will be capitalizable. The new standard also requires expanded quantitative and qualitative disclosures. This update is effective for fiscal years beginning after December 15, 2018, including interim periods within those years, and early adoption is permitted. The updated standard requires the use of the modified re

Loss on Disposal of Assets and

Loss on Disposal of Assets and Costs from Exit and Disposal Activities	12 Months Ended
	Mar. 31, 2018
Discontinued Operations And Disposal Groups [Abstract]
Loss on Disposal of Assets and Costs from Exit and Disposal Activities	2. LOSS ON DISPOSAL OF ASSETS AND COSTS FROM EXIT AND DISPOSAL ACTIVITIES The Company recorded loss on disposal of assets and costs from exit and disposal activities of $15.0 million, $8.5 million and $0.8 million for the fiscal years ended March 31, 2018, 2017 and 2016, respectively. In fiscal 2018, the Company initiated restructuring activities (the “2018 Restructuring Plan”), including closing four underutilized manufacturing facilities, reducing headcount, optimizing product offerings and eliminating nonessential costs, designed to improve the Company’s cost structure. As additional restructuring opportunities may be identified, the Company does not have an estimated completion date or expected total cost estimate for the 2018 Restructuring Plan. In fiscal year ended March 31, 2017, the Company recorded expenses related to three manufacturing facilities that were closed during fiscal 2017 of approximately $3.5 million. In addition, the Company accelerated depreciation of specifically identified obsolete assets of approximately $3.0 million, and recorded $2.0 million of disposals and partial disposals of fixed assets. The following table summarizes the activity included in Loss on disposal of assets and costs from exit and disposal activities recorded during the fiscal years ended March 31, 2018, 2017 and 2016: (Amounts in thousands) 2018 2017 2016 Accelerated depreciation $ 3,759 $ — $ — Plant severance 2,041 — — Corporate severance 4,133 — — Product rationalization 1,351 Other restructuring activities 159 — — Total 2018 Restructuring Plan activities $ 11,443 $ — $ — Loss on other disposals and partial disposals of property, plant and equipment 3,560 8,509 812 Total loss on disposal of assets and costs from exit and disposal activities $ 15,003 $ 8,509 $ 812 Approximately $11.0 million and $0.4 million of the Total 2018 Restructuring Plan activities related to the Domestic and International reporting segment, respectively. A reconciliation of the beginning and ending amounts of restructuring liability related to the 2018 Restructuring Plan for the year ended March 31, 2018 is as follows: (Amounts in thousands) 2018 Balance at beginning of year $ — Expenses 11,443 Non-cash expenses (4,882 ) Payments (2,660 ) Balance at end of year $ 3,901 As of March 31, 2018, we have $0.5 million of long-term severance liability related to the restructuring activities recorded in Other liabilities in the Consolidated Balance Sheet. Periodically, the Company will dispose of equipment, including equipment accounted for as capital leases. The net loss on the disposition of the equipment was $3.6 million, $8.5 million, and $0.8 million during fiscal 2018, 2017 and 2016, respectively.

Acquisitions

Acquisitions	12 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
Acquisitions	3. ACQUISITIONS Fiscal 2018 Acquisition of DURASLOT, Inc. On August 1, 2017, ADS acquired DURASLOT, Inc., a manufacturer of linear surface drains, for $2.3 million. The acquisition included approximately $2.1 million of tax-deductible goodwill. Fiscal 2017 Acquisition of Plastic Tubing Industries On February 6, 2017, ADS acquired Plastic Tubing Industries (“PTI”), a manufacturer of HDPE pipe and related accessories. With the acquisition, ADS will increase its manufacturing footprint in Georgia and Texas, while adding production capacity to the existing ADS manufacturing facilities in Florida, to better serve growing demand in the region. The purchase price of PTI was $9.5 million, financed through the existing line of credit facility. At the time of acquisition, $8.5 million was paid in cash; the remaining $1.0 million will be paid on August 6, 2018. The results of operations of PTI are included in the Consolidated Statements of Operations after February 6, 2017. The Net sales and Income before income taxes of PTI since the acquisition date included in the Consolidated Statements of Operations for the fiscal year ended March 31, 2017 were immaterial. The fair value of the net assets acquired exceeded the purchase price. The difference was recognized as a gain on bargain purchase in fiscal 2017. The purchase price allocation is as follows: (Amounts in thousands) Intangible assets $ 160 Inventory 2,050 Property, plant and equipment 7,899 Fair value of net assets acquired 10,109 Purchase price 9,500 Gain on bargain purchase $ 609 The acquired identifiable intangible assets represent trade name of $0.2 million (seven-year useful life). The following table contains unaudited pro forma Consolidated Statements of Operations information assuming the acquisition occurred on April 1, 2015 and includes adjustments for amortization of intangibles and depreciation of fixed asset. This unaudited pro forma information is presented for illustrative purposes only and is not indicative of what actual results would have been if the acquisition had taken place on April 1, 2015 or of future results. In addition, the unaudited pro forma consolidated results are not projections of future results of operations of the combined company nor do they reflect the expected realization of any cost savings or synergies associated with the acquisition. Proforma (Amounts in thousands) 2017 2016 Net sales $ 1,266,602 $ 1,302,120 Net income attributable to ADS 33,634 25,100 Unaudited pro forma net income attributable to ADS for the fiscal years ended March 31, 2017 and 2016 has been calculated after adjusting the combined results of the Company to reflect additional intangible asset amortization expense, net of related income taxes, of less than $0.1 million, and depreciation expense, net of related income taxes, of $0.6 million. Fiscal 2016 Step Acquisition of BaySaver On July 17, 2015, ADS Ventures, Inc. (“ADS/V”), a wholly-owned subsidiary of the Company, acquired an additional 10% of the issued and outstanding membership interests in BaySaver, increasing the Company’s total ownership interest in BaySaver to 65%, for a purchase price of $3.2 million, plus contingent consideration with an initial estimated fair value of $0.8 million. Concurrent with the purchase of the additional membership investment, the BaySaver joint venture agreement was amended to modify the voting rights from an equal vote for each member to a vote based upon the ownership interest. As a result, the Company has accounted for this transaction as a business combination with BaySaver being consolidated into the financial statements after July 17, 2015. As the Company has accounted for the investment in BaySaver prior to the purchase of the 10% additional membership interest under the equity method of accounting, the Company accounted for this business combination as a step acquisition and recognized a loss of $0.5 million on remeasurement to fair value of the previously held investment. The loss is included in Derivative losses and other expense, net in the Consolidated Statements of Operations. The fair value of our BaySaver investment immediately before the July 17, 2015 acquisition was measured based on a combination of the discounted cash flow and guideline public company valuation methods and involves significant unobservable inputs (Level 3). These inputs include projected sales, margin, required rate of return and tax rate for the discounted cash flow method, as well as implied pricing multiples, and guideline public company group for the guideline public company method. The purchase price was determined as follows: (Amounts in thousands) Acquisition-date fair value of prior equity interest $ 4,220 Acquisition-date fair value of noncontrolling interest 6,330 Cash paid at acquisition date 3,200 Fair value of contingent consideration 750 Total purchase price $ 14,500 The purchase price has been allocated to the estimated fair values of acquired tangible and intangible assets, assumed liabilities and goodwill. The fair value of identifiable intangible assets has been determined primarily using the income approach, which involves significant unobservable inputs (Level 3 inputs). These inputs include projected sales, margin, required rate of return and tax rate, as well as an estimated royalty rate in the cases of the developed technology and trade name and trademark intangibles. The developed technology and trade name and trademark intangibles are valued using a relief-from-royalty method. Redeemable noncontrolling interest in subsidiaries is classified as mezzanine equity in the Consolidated Balance Sheets due to a put option held by the joint venture partner, which may be exercised on or after April 1, 2017. The redeemable noncontrolling interest balance will be accreted to the estimated redemption value using the effective interest method until April 1, 2017. The excess of the purchase price over the fair value of the net assets acquired of $2.5 million was allocated to goodwill, assigned to the Domestic segment, and consists primarily of the acquired workforce and sales and cost synergies the two companies anticipate realizing as a combined company. None of the goodwill is deductible for tax purposes. The purchase price allocation is as follows: (Amounts in thousands) Cash $ 12 Other current assets 2,262 Property, plant and equipment 164 Goodwill 2,495 Intangible assets 10,800 Other assets 152 Current liabilities (1,385 ) Total purchase price $ 14,500 The acquired identifiable intangible assets represent customer relationships of $5.4 million, developed technology of $4.0 million and trade name and trademark of $1.4 million, each of which have an estimated 10-year useful life. Transaction costs were immaterial. The net sales and income before income taxes of BaySaver since the acquisition date included in the Consolidated Statements of Operations for the fiscal year ended March 31, 2016 were $10.2 million, and $1.2 million, respectively. The following table contains unaudited pro forma Consolidated Statements of Operations information assuming the acquisition occurred on April 1, 2014 and includes adjustments for amortization of intangibles, interest expense and the prior equity method accounting for BaySaver. This unaudited pro forma information is presented for illustrative purposes only and is not indicative of what actual results would have been if the acquisition had taken place on April 1, 2014 or of future results. The unaudited pro forma consolidated results are not projections of future results of operations of the combined company nor do they reflect the expected realization of any cost savings or synergies associated with the acquisition. Proforma (Amounts in thousands) 2016 Net sales $ 1,294,277 Net income (loss) attributable to ADS 25,090 Unaudited pro forma net income attributable to ADS has been calculated after adjusting the combined results of the Company to reflect additional intangible asset amortization expense, net of related income taxes and amounts related to the noncontrolling interest, of $0.1 million, additional interest expense, net of related income taxes and amounts related to the noncontrolling interest, of less than $0.1 million and the impact of our prior equity method accounting of $0.1 million, net of related income taxes, for the year ended March 31, 2016.

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Mar. 31, 2018
Property Plant And Equipment [Abstract]
Property, Plant and Equipment	4. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment, net as of the fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 Land, buildings and improvements $ 200,459 $ 189,163 Machinery and equipment 780,210 771,878 Construction in progress 6,607 14,022 Total cost 987,276 975,063 Less: accumulated depreciation (587,895 ) (568,205 ) Property, plant and equipment, net $ 399,381 $ 406,858 The following table sets forth depreciation expense related to Property, plant and equipment in each of the fiscal years ended March 31: (Amounts in thousands) 2018 2017 2016 Depreciation expense (inclusive of leased assets depreciation) (1) $ 63,044 $ 58,692 $ 55,650 (1) Depreciation expense does not include accelerated depreciation expense from the 2018 Restructuring plan. See “Note 2. Loss on Disposal of Assets and Costs from Exit and Disposal Activities” for additional discussion.

Leases

Leases	12 Months Ended
	Mar. 31, 2018
Leases [Abstract]
Leases	5. LEASES Capital Leases - The Company leases certain buildings and transportation equipment including its fleet of trucks and trailers, under capital lease agreements. Leased assets included in Property, plant and equipment as of the fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 Buildings and improvements $ 6,124 $ 6,044 Machinery and equipment 208,475 199,813 Total cost 214,599 205,857 Less: accumulated depreciation (110,346 ) (108,144 ) Leased assets in Property, plant and equipment, net $ 104,253 $ 97,713 The following sets forth the interest and depreciation expense related to capital leases recorded in each fiscal year ended March 31: (Amounts in thousands) 2018 2017 2016 Lease interest expense $ 4,086 $ 3,864 $ 3,367 Depreciation of leased assets 18,511 17,415 15,782 The following is a schedule by year of future minimum lease payments under capital leases and the present value of the net minimum lease payments as of March 31, 2018: (Amounts in thousands) 2019 $ 24,809 2020 20,660 2021 16,723 2022 12,887 2023 7,199 Thereafter 7,699 Total minimum lease payments (a) $ 89,977 Less: amount representing interest (b) 8,007 Present value of net minimum lease payments $ 81,970 Current maturities of capital lease obligations 22,007 Long-term capital lease obligations 59,963 Total lease obligation $ 81,970 (a) Excludes contingent rentals which may be paid. Contingent rentals amounted to $0.6 million, $0.6 million and $0.1 million for the years ended March 31, 2018, 2017 and 2016, respectively. (b) Amount necessary to reduce minimum lease payments to present value calculated at the lower of the rate implicit in the lease or the Company’s incremental borrowing rate at lease inception. Certain leases contain residual value guarantees that create a contingent obligation on the part of the Company to compensate the lessor if the leased asset cannot be sold for an amount in excess of a specified minimum value at the conclusion of the lease term. The calculation is based on the original cost of the transportation equipment, less lease payments made, compared to a percentage of the transportation equipment’s fair market value at the time of sale. All leased units covered by this guarantee have been classified as capital leases and a corresponding capital lease obligation was recorded. Therefore, no further contingent obligation is needed. Operating leases - The Company leases certain real estate and office equipment under various cancellable and non-cancellable operating lease agreements that expire at various dates through fiscal year 2037. Future minimum rental commitments under non-cancellable operating leases as of March 31, 2018, are summarized below (amounts in thousands): 2019 2020 2021 2022 2023 Thereafter Future operating lease payments $ 3,297 $ 2,371 $ 1,645 $ 1,033 $ 662 $ 2,648 Total rent expense was $6.6 million, $6.6 million, and $6.3 million in the fiscal years ended March 31, 2018, 2017, and 2016, respectively.

Inventories

Inventories	12 Months Ended
	Mar. 31, 2018
Inventory Disclosure [Abstract]
Inventories	6. INVENTORIES Inventories as of the fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 Raw materials $ 54,909 $ 52,746 Finished goods 208,883 205,684 Total Inventories $ 263,792 $ 258,430 The Company had no work-in-process inventories as of March 31, 2018 and 2017. During fiscal years ended March 31, 2018 and 2017, the Company incurred production-related general and administrative costs included in the cost of finished goods inventory of $27.0 million and $21.2 million, respectively, of which $6.5 million and $6.3 million remained in inventory at March 31, 2018 and 2017, respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	7. GOODWILL AND INTANGIBLE ASSETS Goodwill - The carrying amount of goodwill by reportable segment is as follows: (Amounts in thousands) Domestic International Total Balance at April 1, 2016 $ 90,002 $ 10,883 $ 100,885 Currency translation — (319 ) (319 ) Balance at March 31, 2017 $ 90,002 $ 10,564 $ 100,566 Acquisition 2,103 — 2,103 Currency translation — 348 348 Balance at March 31, 2018 $ 92,105 $ 10,912 $ 103,017 Intangible Assets - Intangible assets as of March 31, 2018 and 2017 consisted of the following: 2018 2017 (Amounts in thousands) Gross Intangible Accumulated Amortization Net Intangible Gross Intangible Accumulated Amortization Net Intangible Definite-lived intangible assets Developed technology $ 27,580 $ (17,405 ) $ 10,175 $ 27,580 $ (14,888 ) $ 12,692 Customer relationships 31,035 (20,567 ) 10,468 40,767 (26,768 ) 13,999 Patents 7,512 (4,956 ) 2,556 7,512 (4,768 ) 2,744 Non-compete and other contractual agreements 607 (567 ) 40 1,242 (1,102 ) 140 Trademarks and tradenames 15,969 (6,678 ) 9,291 15,741 (5,465 ) 10,276 Total definite-lived intangible assets 82,703 (50,173 ) 32,530 92,842 (52,991 ) 39,851 Indefinite-lived intangible assets Trademarks 11,907 — 11,907 11,907 — 11,907 Total Intangible assets $ 94,610 $ (50,173 ) $ 44,437 $ 104,749 $ (52,991 ) $ 51,758 The gross intangible asset value of customer relationships and non-compete and other contractual agreements decreased due to intangible assets fully amortized in fiscal 2017. Trademarks and tradenames increased as a result of the Duraslot acquisition. The following table presents the weighted average amortization period for definite-lived intangible assets at March 31, 2018: Weighted Average Amortization Period (in years) Developed technology 11.0 Customer relationships 8.6 Patents 8.2 Non-compete and other contractual agreements 5.2 Trademarks and tradenames 13.4 The following table presents the future intangible asset amortization expense based on existing intangible assets at March 31, 2018: Fiscal Year (Amounts in thousands) 2019 2020 2021 2022 2023 Thereafter Total Amortization expense $ 7,702 $ 6,017 $ 5,876 $ 4,159 $ 2,520 $ 6,256 $ 32,530

Fair Value Measurement

Fair Value Measurement	12 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurement	8. FAIR VALUE MEASUREMENT When applying fair value principles in the valuation of assets and liabilities, the Company is 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 fiscal years presented. The fair value estimates take into consideration the credit risk of both the Company and its counterparties. When active market quotes are not available for financial assets and liabilities, ADS uses 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, liabilities and mezzanine equity carried at fair value as of the fiscal years ended March 31 were as follows: March 31, 2018 (Amounts in thousands) Total Level 1 Level 2 Level 3 Assets: Derivative assets — diesel fuel contracts $ 596 $ — $ 596 $ — Interest rate swaps 2,801 — 2,801 — Total assets at fair value on a recurring basis $ 3,397 $ — $ 3,397 $ — Liabilities: Derivative liability - diesel fuel contracts $ 116 $ — $ 116 $ — Contingent consideration for acquisitions 578 — — 578 Total liabilities at fair value on a recurring basis $ 694 $ — $ 116 $ 578 March 31, 2017 (Amounts in thousands) Total Level 1 Level 2 Level 3 Assets: Derivative assets — diesel fuel contracts $ 179 $ — $ 179 $ — Total assets at fair value on a recurring basis $ 179 $ — $ 179 $ — Liabilities: Derivative liability - diesel fuel contracts $ 142 $ — $ 142 $ — Contingent consideration for acquisitions 1,348 — — 1,348 Total liabilities at fair value on a recurring basis $ 1,490 $ — $ 142 $ 1,348 Quantitative Information about Level 3 Fair Value Measurements (Amounts in thousands) Liabilities & Mezzanine Equity Fair Value at 3/31/18 Valuation Technique(s) Unobservable Input Quantifiable Input Contingent consideration for acquisitions $ 578 Discounted cash flow Weighted Average Cost of Capital (“WACC”) (a) 9.50% Liabilities & Mezzanine Equity Fair Value at 3/31/17 Valuation Technique(s) Unobservable Input Quantifiable Input Contingent consideration for acquisitions $ 1,348 Discounted cash flow Weighted Average Cost of Capital (“WACC”) (a) 9.50% (a) Represents discount rates or rates of return estimates and assumptions that the Company believes would be used by market participants when valuing these liabilities. Changes in the fair value of recurring fair value measurements using significant unobservable inputs (Level 3) for the fiscal years ended March 31, 2018 and 2017 were as follows: Contingent consideration Balance at March 31, 2016 $ 2,858 Change in fair value (266 ) Payments of contingent consideration liability (1,244 ) Balance at March 31, 2017 $ 1,348 Change in fair value 39 Payments of contingent consideration liability (809 ) Balance at March 31, 2018 $ 578 There were no transfers in or out of Levels 1, 2 and 3 for the fiscal years ended March 31, 2018 and 2017. Valuation of Contingent Consideration for Acquisitions - The fair values of the contingent consideration payables for acquisitions were calculated based on a discounted cash flow model, whereby the probability-weighted future payment value is discounted to the present value using a market discount rate. The method used to price these liabilities is considered Level 3, due to the subjective nature of the unobservable inputs used to determine the fair value. Valuation of Debt - The carrying amounts of current financial assets and liabilities approximate fair value because of the immediate or short-term maturity of these items, or in the case of derivative instruments, because they are recorded at fair value. The carrying and fair value of the Company’s Senior Notes (discussed in “Note 12. Debt”) were $125.0 million and $122.3 million, respectively, as of March 31, 2018 and $75.0 million and $75.9 million, respectively, at March 31, 2017. The fair value of the Senior Notes was determined based on a comparison of the interest rate and terms of such borrowings to the rates and terms of similar debt available for the period. The Company believes the carrying amount on the remaining long-term debt, including the Secured Bank Loans, is not materially different from its fair value as the interest rates and terms of the borrowings are similar to currently available borrowings. The categorization of the framework used to evaluate this debt is considered Level 2. Non-recurring Fair Value Measurements Valuation of Investment in the South American Joint Venture - During the fourth quarter of each of the fiscal years ended March 31, 2017 and 2016, the Company recorded an impairment charge related to its investment in the South American Joint Venture equal to the difference between the fair value of the investment and the carrying value. The method used to value the investment is considered Level 3 due to the subjective nature of the unobservable inputs used to determine the fair value. In the determination of fair value of its investment, the Company used a weighted income approach, based on internal forecasts of expected future cash flows, and market approach, based on comparable public companies. Significant unobservable inputs included the WACC used to discount the future cash flows, which were between 9.3% and 16.5%, based on the markets in which the South American Joint Venture conducts business. See “Note 10. Investment in Unconsolidated Affiliates.”

Investment in Affiliates

Investment in Affiliates	12 Months Ended
	Mar. 31, 2018
Unconsolidated Affiliates [Member]
Investment in Affiliates	10. INVESTMENT IN UNCONSOLIDATED AFFILIATES The Company participates in two unconsolidated joint ventures, South American Joint Venture, which is 50% owned by the Company’s wholly-owned subsidiary ADS Chile, and Tigre-ADS USA, Inc. (“Tigre-ADS USA”), which is 49% owned by the Company’s wholly-owned subsidiary ADS Ventures, Inc. The Company has concluded that it is appropriate to account for these investments using the equity method, whereby the Company’s share of the income or loss of the joint venture is reported in the Consolidated Statements of Operations under Equity in net loss (income) of unconsolidated affiliates and the Company’s investment in the joint venture is included in Other assets in the Consolidated Balance Sheets. South American Joint Venture - The Company’s investment in this unconsolidated joint venture was formed for the purpose of expanding upon the 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. The Company is not required to consolidate the South American Joint Venture as it is not the primary beneficiary, although the Company does hold significant variable interests in the South American Joint Venture through the equity investment and debt guarantee. Summarized financial data as of the fiscal years ended March 31 for the South American Joint Venture is as follows: (Amounts in thousands) 2018 2017 Investment in South American Joint Venture $ 12,343 $ 6,559 Net Receivable from South American Joint Venture 817 3,639 In order to improve the South American Joint Venture’s working capital position and allow it to reallocate capital resources to business growth, the Company and the joint venture partner each contributed equal amounts of outstanding receivables owed to them from the South American Joint Venture in exchange for incremental ownership interest in the South American Joint Venture in December 2017. The Company and the joint venture partner continue to maintain a 50% ownership interest in the South American Joint Venture following the contribution. As a result of the transaction the Company contributed receivables of approximately $5.8 million net of a $3.0 million allowance for doubtful accounts and recorded an additional investment in the South American Joint Venture at the fair value of $4.7 million and a $1.9 million gain on the book value of the receivables. The investment is recorded within Other assets on the Company’s Consolidated Balance Sheets and the gain is recorded within Equity in net (income) loss of unconsolidated affiliates on the Company’s Consolidated Statements of Operations. During the fourth quarter of each of the fiscal years ended March 31, 2017 and 2016, the Company determined there was an other-than-temporary decline in the fair value of its investment in the South American Joint Venture, resulting from a further decline of unfavorable regional economic conditions. Accordingly, the Company recorded impairment charges of $1.3 million and $4.0 million, respectively, reducing the carrying value of the investment to its fair value. The past impairment charges resulted in a basis difference between the cost of the investment and the amount of underlying equity in net assets of the South American Joint Venture of $4.4 million and $4.9 million as of March 31, 2018 and 2017 respectively. The basis difference will be amortized over the estimated remaining useful life of the underlying property, plant and equipment, 8 years. The Company recognized $0.5 million, $0.4 million and $0.1 million of amortization of the basis difference in fiscal 2018, 2017 and 2016, respectively. The impairment charge is included in Equity in net loss of unconsolidated affiliates in the Consolidated Statements of Operations. Tigre-ADS USA - The 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 joint venture represents a continuation of the existing activities of Tigre-ADS USA through its Janesville, Wisconsin manufacturing facility. The Company is not required to consolidate Tigre-ADS USA as it is not the primary beneficiary, although the Company does hold a significant variable interest in Tigre-ADS USA through the equity investment. In April 2018, the Company and the joint venture partner agreed to exchange the Company’s shares of Tigre-ADS USA for a release from the existing debt guarantees. Following the exchange, the Company no longer has an interest in Tigre-ADS USA. As a result of the agreement, the Company determined there was an other-than-temporary decline in the fair value of its investment in Tigre-ADS USA. Accordingly, the Company recorded an impairment charge of $0.3 million, reducing the carrying value of the investment to its fair value. The impairment charge is included in Equity in net loss of unconsolidated affiliates in the Consolidated Statements of Operations. Summarized financial data as of the fiscal years ended March 31 for the Tigre-ADS USA joint venture is as follows: (Amounts in thousands) 2018 2017 Investment in Tigre-ADS USA $ — $ 2,427 Receivable from Tigre-ADS USA 10 9
Subsidiaries [Member]
Investment in Affiliates	9. INVESTMENT IN CONSOLIDATED AFFILIATES ADS participates in two consolidated joint ventures, ADS Mexicana, which is 51% owned by the Company’s wholly-owned subsidiary ADS Worldwide, Inc., and BaySaver, which is 65% owned by the Company’s wholly-owned subsidiary ADS Ventures, Inc. The equity owned by the Company’s joint venture partner is shown as either Noncontrolling interest in subsidiaries (ADS Mexicana) or Redeemable noncontrolling interest in subsidiaries (BaySaver) in the Consolidated Balance Sheets and the joint venture partner’s portion of net income is shown as Net income attributable to noncontrolling interest in the Consolidated Statements of Operations. ADS Mexicana - ADS participates in joint ventures for the purpose of expanding upon the growth of manufacturing and selling HDPE corrugated pipe and PVC conduit in emerging markets. ADS invested in ADS Mexicana 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. The Company owns a 51% equity interest in ADS Mexicana. The Company 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. The Company has concluded that it holds a variable interest in and is the primary beneficiary of ADS Mexicana based on the power to direct the most significant activities of ADS Mexicana and the obligation to absorb losses and the right to receive benefits that could be significant to ADS Mexicana. As the primary beneficiary, the Company is required to consolidate the assets and liabilities of ADS Mexicana. The table below includes the assets and liabilities of ADS Mexicana that are consolidated as of March 31, 2018 and 2017. The balances exclude intercompany transactions that are eliminated upon consolidation. (Amounts in thousands) 2018 2017 Assets Current assets $ 24,616 $ 24,952 Property, plant and equipment, net 18,855 19,262 Other noncurrent assets 1,314 2,269 Total assets $ 44,785 $ 46,483 Liabilities Current liabilities $ 8,979 $ 11,042 Noncurrent liabilities 1,343 2,961 Total liabilities $ 10,322 $ 14,003 BaySaver - BaySaver was established in July 2013 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 acquisition of an additional interest in BaySaver is disclosed in “Note 3. Acquisitions”. The table below includes the assets and liabilities of BaySaver that are consolidated as of March 31, 2018 and 2017. The balances exclude intercompany transactions that are eliminated upon consolidation. (Amounts in thousands) 2018 2017 Assets Current assets $ 3,761 $ 2,572 Property, plant and equipment, net 216 111 Other noncurrent assets 10,470 11,568 Total assets $ 14,447 $ 14,251 Liabilities Current liabilities $ 820 $ 1,344 Total liabilities $ 820 $ 1,344 Redeemable Noncontrolling Interest in Subsidiaries - The membership interests held by the joint venture partner are presented in Redeemable noncontrolling interest in subsidiaries in the Consolidated Balance Sheets, which is classified as mezzanine equity, due to a put option held by the joint venture partner which may be exercised on or after April 1, 2017. The Redeemable noncontrolling interest in subsidiaries balance was accreted to the redemption value using the effective interest method until April 1, 2017.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	11. RELATED PARTY TRANSACTIONS ADS Mexicana - ADS conducts business in Mexico and Central America through its joint venture ADS Mexicana. In April 2015, ADS Mexicana borrowed $3.0 million under a revolving credit facility arrangement with Scotia Bank and loaned that amount to ADS. The loan was repaid in May 2015. In June 2015, ADS Mexicana borrowed $3.9 million under the Scotia Bank credit facility and loaned it to an entity owned by a Grupo Altima shareholder, and such loan was repaid in July 2015. The applicable interest rate for the loans was 4.81%. ADS does not guarantee the borrowings from this facility, and therefore does not anticipate any required contributions related to the balance of this credit facility. The Scotia Bank revolving credit facility matured on December 11, 2017. The Company is the guarantor of 100% of the ADS Mexicana Revolving Credit Facility, and the maximum potential payment under this guarantee totals $12.0 million. See “Note 12. Debt.” South American Joint Venture - The Company’s South American Joint Venture manufactures and sells HDPE corrugated pipe in the South American market. ADS is the guarantor for 50% of the South American Joint Venture’s credit facility, and the debt guarantee is shared equally with the joint venture partner. The maximum potential obligation under this guarantee totals $11.0 million as of March 31, 2018. The maximum borrowing permitted under the South American Joint Venture’s credit facility is $22.0 million. This credit facility allows borrowings in either Chilean pesos or US dollars at a fixed interest rate determined at inception of each draw on the facility. The guarantee of the South American Joint Venture’s debt expires on December 31, 2020. ADS does not anticipate any required contributions related to the balance of this credit facility. As of March 31, 2018 and 2017, the outstanding principal balance of the credit facility including letters of credit was $14.5 million and $16.0 million, respectively. As of March 31, 2018, there were no U.S. dollar denominated loans. The weighted average interest rate as of March 31, 2018 was 5.82% on Chilean peso denominated loans. ADS and the South American Joint Venture have entered into shared services arrangements in order to execute the joint venture services. Occasionally, the South American Joint Venture enters into agreements for pipe sales with ADS and its other related parties, which were $2.1 million and $1.3 million in the fiscal years ended March 31, 2018 and 2017, respectively. ADS pipe sales to the South American Joint Venture were $0.4 million and $0.9 million in the fiscal years ended March 31, 2018 and 2017, respectively. BaySaver - BaySaver is a joint venture that was established to produce and distribute water quality filters and separators used in the removal of sediment and pollution from storm water. ADS owns 65% of the outstanding stock of BaySaver and consolidates its interest in BaySaver. BaySaver may at times provide short-term financing to ADS to enhance liquidity. As of March 31, 2015, BaySaver held unsecured, interest-free, notes receivable from ADS of $0.5 million, which were fully paid in fiscal year 2016. ADS and BaySaver have entered into shared services arrangements in order to execute the joint venture services. Included within these arrangements are the lease of a plant and adjacent yard used to conduct business and operating expenses related to the leased facility. Occasionally, ADS and BaySaver jointly enter into agreements for sales of pipe and Allied Products with their related parties in immaterial amounts. Tigre-ADS USA - Tigre-ADS USA is a joint venture established to manufacture and sell PVC fittings for waterworks, plumbing, and HVAC applications primarily in the United States and Canadian markets. ADS owns 49% of the outstanding shares of capital stock of Tigre-ADS USA. The joint venture represents a continuation of the existing activities of Tigre-ADS USA through its Janesville, Wisconsin manufacturing facility. ADS purchased $2.0 million, $1.6 million and $0.7 million of Tigre-ADS USA manufactured products for use in the production of ADS products during fiscal years 2018, 2017 and 2016, respectively.

Debt

Debt	12 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Debt	12. DEBT Long-term debt as of the fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 Secured Bank Loans Revolving Credit Facility — ADS $ 171,500 $ 194,300 Revolving Credit Facility — ADS Mexicana — 1,500 Term Note — 72,500 Senior Notes payable 125,000 75,000 Industrial revenue bonds 940 1,845 Equipment financing 3,336 4,216 ADS Mexicana Scotia Bank revolving credit facility — 1,000 Total 300,776 350,361 Unamortized debt issuance costs (3,028 ) (1,723 ) Current maturities (26,848 ) (37,789 ) Long-term debt obligations $ 270,900 $ 310,849 Long-term Debt Modification Secured Bank Loans - On June 22, 2017, the Company and certain of its subsidiaries, as guarantors (collectively, the “Guarantors”), entered into a Second Amended and Restated Credit Agreement (the “Credit Agreement”) with PNC Bank, National Association (“PNC”), as administrative agent (in such capacity, the “Agent”), and various financial institutions party thereto (together with PNC, collectively, the “Lenders”), pursuant to which the Lenders have committed to provide the Company a $550.0 million revolving credit facility (with an option to increase such revolving credit facility or incur new term loans in an agreement amount of up to $150.0 million) subject to the terms and conditions in the Credit Agreement. The Credit Agreement amends and restates the Amended and Restated Credit Agreement dated as of June 12, 2013, as amended, among the Company and certain of its subsidiaries, as guarantors, various financial institutions party thereto, and the Agent. The Secured Bank Loans are secured by a lien on a significant majority of the Company’s assets. Letters of credit outstanding at March 31, 2018 amounted to $13.0 million and reduce the availability of the Revolving Credit Facilities. The amount available for borrowing for ADS, Inc. and ADS Mexicana was $365.5 million and $12.0 million, respectively at March 31, 2018. Borrowings under the credit facility will be used for general corporate purposes, including repurchases of stock, repayments of existing indebtedness, repayments of short-term borrowings, working capital requirements, capital expenditures and acquisitions. The interest rates under the Credit Agreement are determined by certain base rates or LIBOR rates, plus an applicable margin based on the Leverage Ratio then in effect. The average interest rate was 3.39% as of March 31, 2018. The Credit Agreement has an expiration date of June 22, 2022. The Credit Agreement sets forth certain customary business and financial covenants to which the Company and Guarantors are subject when any amounts under the Credit Agreement are outstanding, including covenants that limit or restrict the ability of the Company and the Guarantors to incur indebtedness, to make capital distributions, and to incur certain liens and encumbrances on any of its respective property. The two primary financial covenants of the Credit Agreement require the Company to maintain a certain Leverage Ratio and an Interest Coverage Ratio. The Credit Agreement Leverage Ratio generally requires that at the end of any fiscal quarter, for the four fiscal quarters then ended, the Company will not permit the ratio of its total consolidated indebtedness to the Company’s Consolidated EBITDA (as defined in the Credit Agreement) to be greater than 4.00 to 1.00 (or 4.25 to 1.00 as of the date of any acquisitions permitted under the Credit Agreement for which the aggregate consideration is $100.0 million or greater). The Credit Agreement Interest Coverage Ratio generally requires that at the end of any fiscal quarter, for the four fiscal quarters then ended, the Company will not permit the ratio of Consolidated EBITDA to the Company’s consolidated interest expense payable during such period to be less than 3.00 to 1.00. The Credit Agreement provides for customary events of default, including, among other things, in the event of nonpayment of principal, interest, or other amounts, a representation or warranty proving to have been incorrect in any material respect when made, failure to perform or observe certain covenants within a specified period of time, a cross-default to other Company indebtedness of a specified amount, the bankruptcy or insolvency of the Company or a Guarantor, monetary judgment defaults of a specified amount, a change of control of the Company, and ERISA defaults resulting in liability under certain circumstances. In the event of a default by the Company, the Agent or the requisite number of Lenders may declare all amounts owed under the Credit Agreement and outstanding letters of credit immediately due and payable and terminate the Lenders’ commitments to make loans under the Credit Agreement. For defaults related to bankruptcy, insolvency or reorganization proceedings, the commitments of the Lenders will be automatically terminated and all outstanding loans and other amounts will become immediately due and payable. On June 28, 2017, ADS executed a Forward Interest Rate Swap on the 30-Day LIBOR interest rate to mitigate the impact of interest rate volatility. The swap has a notional value of $100.0 million and a fixed rate of 1.8195% for a five year period. Senior Notes - On June 22, 2017, the Company and the Guarantors entered into the Second Amended and Restated Private Shelf Agreement (the “Private Shelf Agreement”) with PGIM, Inc. (“Prudential”) and certain other parties thereto. The Private Shelf Agreement amends and restates the Amended and Restated Private Shelf Agreement dated as of September 24, 2010, as amended, pursuant to which the Company has previously issued and sold secured senior notes of the Company. Under the terms of the Private Shelf Agreement, the Company may request that Prudential purchase, over the next three years, secured senior notes of the Company so long as the aggregate principal amount of notes outstanding at any time does not exceed $175.0 million (the “Shelf Notes”). The Shelf Notes shall bear interest at a fixed interest rate and have a maturity date not to exceed ten years from the date of issuance. Prudential and its affiliates are under no obligation to purchase any of the Shelf Notes. The interest rate and terms of payment of any series of Shelf Notes will be determined at the time of purchase. The proceeds of any series of Shelf Notes will be used as specified in the request for purchase with respect to such series, subject to compliance with the requirements in the Private Shelf Agreement, but are anticipated to be used for general corporate purposes, including refinancing of short-term borrowings and/or repayment of outstanding indebtedness under the Credit Agreement, which is described above, as well as financing of capital expenditures and acquisitions. Obligations under the Private Shelf Agreement are secured by capital stock of certain direct and indirect subsidiaries of the Company and the Guarantors and substantially all other tangible and intangible personal property owned by the Company and the Guarantors. Obligations under the Private Shelf Agreement are secured by the collateral on a pari passu basis with obligations under the Credit Agreement. The Private Shelf Agreement sets forth certain customary business and financial covenants to which the Company and Guarantors are subject when any Shelf Note is outstanding, including covenants that limit or restrict the ability of the Company and the Guarantors to incur indebtedness, to make capital distributions, and to incur certain liens and encumbrances on any of its respective property. The two primary financial covenants of the Private Shelf Agreement require the Company to maintain a certain Leverage Ratio and an Interest Coverage Ratio. The Private Self Agreement Leverage Ratio generally requires that at the end of any fiscal quarter, for the four fiscal quarters then ended, the Company will not permit the ratio of its total consolidated indebtedness to the Company’s Consolidated EBITDA (as defined in the Private Shelf Agreement) to be greater than 4.00 to 1.00 (or 4.25 to 1.00 as of the date of any acquisitions permitted under the Private Self Agreement for which the aggregate consideration is $100.0 million or greater). The Private Self Agreement Interest Coverage Ratio generally requires that at the end of any fiscal quarter, for the four fiscal quarters then ended, the Company will not permit the ratio of Consolidated EBITDA to the Company’s consolidated interest expense payable during such period to be less than 3.00 to 1.00. The Private Shelf Agreement provides for customary events of default, including, among other things, in the event of nonpayment of principal, interest, or other amounts, a representation or warranty proving to have been incorrect in any material respect when made, failure to perform or observe certain covenants within a specified period of time, a cross-default to other Company indebtedness of a specified amount, the bankruptcy or insolvency of the Company or a Guarantor, monetary judgment defaults of a specified amount, a change of control of the Company, and ERISA defaults resulting in liability under certain circumstances. In the event of a default by the Company, any or all holders of Shelf Notes may declare amounts owed under the Private Shelf Agreement immediately due and payable. For defaults related to bankruptcy, insolvency or reorganization proceedings, all amounts owed under the Agreement will become immediately due and payable, and Prudential may at its option terminate the Private Shelf Note Facility. On June 28, 2017, the Company issued and sold Shelf Notes in the aggregate principal amount of $75.0 million pursuant to the Private Shelf Agreement. The $75.0 million of Shelf Notes bears interest at a fixed interest rate of 3.53% per annum and have a maturity date of seven years from the date of issuance. The rate is subject to an additional 100 basis point excess leverage fee if the calculated leverage ratio exceeds 3 to 1 at the end of a fiscal quarter. Master Loan and Security Agreement – In June 2016, ADS signed a Master Loan and Security Agreement for Equipment Financing in the U.S. and Canada for an aggregate amount of up to $4.5 million. During fiscal 2017, the Company issued $4.6 million of Equipment Notes with a weighted average fixed interest rate at 2.72%, with the aggregate loan amount during fiscal 2017 reaching a total of $4.2 million, net of principal payments. Each Equipment Note amortizes the principal over five years and is payable monthly. Secured Bank Loans – Prior to the long-term debt modification in June 2017, the Company had a revolving credit facility with borrowing capacity of $325.0 million for ADS, Inc., a Revolving Credit Facility for ADS Mexicana with borrowing capacity of $12.0 million and a $100.0 million term note. The Company did not modify ADS Mexicana’s borrowing capacity. The ADSM Mexicana revolving credit facility expires in June 2018. The revolving credit facilities and the term note had a variable interest rate that depended upon the Company’s “pricing ratio” as defined in the agreements for the revolving credit facilities. The interest rate was derived from the London Inter-Bank Offered Rate (“LIBOR”) or alternate base rate (“Prime Rate”) at the Company’s option. The average rates were 2.61% and 2.70%, at March 31, 2017 and 2016, respectively. Senior Notes Payable – Prior to the long-term debt modification in June 2017, the Company had an agreement with Prudential Investment Management, Inc. for the issuance of senior promissory notes (“Senior Notes”), for an aggregate amount of up to $100.0 million. During fiscal 2010, the Company issued $75.0 million of Senior Notes with interest fixed at 5.6% and payable quarterly. The rate was subject to an additional 200 basis point excess leverage fee if the calculated leverage ratio exceeds 3 to 1 at the end of a fiscal quarter. In July 2013, ADS issued an additional $25.0 million of Senior Notes. Interest for the additional $25.0 million is payable quarterly and is fixed at 4.05%. A principal payment of $25.0 million was made in fiscal 2017 and fiscal 2018. Principal payments of $25.0 million will be made in fiscal 2019 and 2020. Industrial Revenue Bonds - Between 1996 and 2007, ADS issued industrial revenue bonds for the construction of four production facilities. Two of the bonds were retired during fiscal 2011 and one of the bonds was retired in fiscal 2015. The remaining bond requires quarterly principal payments until it matures in February 2019 and has a variable interest rate based on the Securities Industry and Financial Markets Association (SIFMA) municipal swap index rate which is computed weekly. The rate on this bond at March 31, 2018, was 3.42%, including a letter of credit fee of 1.75%. Land and buildings with a net book value of approximately $9.1 million at March 31, 2018, collateralize the bonds. These bonds are not considered auction rate securities. ADS Mexicana Scotia Bank Revolving Credit Facility - On December 11, 2014, ADS’s joint venture, ADS Mexicana, entered into a credit agreement with Scotia Bank. The credit agreement provides for revolving loans up to a maximum aggregate principal amount of $5.0 million. The proceeds of the revolving credit facility have primarily been used for short term investments and are available for working capital needs. The interest rates of the revolving credit facilities are determined by LIBOR rates, Tasa de Interes Interbancaria de Equilibrio (TIIE) or the Costos de Captacion rates, plus an applicable margin. On May 27, 2016, ADS Mexicana obtained a waiver on a covenant from Scotia Bank relating to ADS Mexicana failing to notify Scotia Bank of changes in legal organizational structure and payment of dividends. The Scotia Bank revolving credit facility matured on December 11, 2017. The obligations under the revolving credit facility were not guaranteed by ADS. As of the maturity date, there was no outstanding principal drawn on the Scotia Bank revolving credit facility, which bore interest at the LIBOR, plus 1.60%. Principal Maturities - Maturities of long-term debt (excluding interest and deferred financing costs) as of March 31, 2018 are summarized below: Fiscal Years Ending March 31, (Amounts in thousands) 2019 2020 2021 2022 2023 Thereafter Total Principal maturities $ 26,848 $ 25,936 $ 960 $ 532 $ 171,500 $ 75,000 $ 300,776 Fiscal Year 2017 Amendments and Consents Related to the Secured Bank Loans and Senior Notes - In July 2016, the Company obtained consents from the lenders of the previous Secured Bank Loans and Senior Notes. These consents had the effect of extending the time for delivery of the Company’s fiscal 2016 audited financial statements to August 31, 2016 and first quarter fiscal 2017 quarterly financial information to October 15, 2016, whereby an event of default was waived as long as those items are delivered within a 15 day grace period after those dates. The fiscal 2016 audited financial statements were delivered within the grace period. In addition, the consents also permitted the Company’s payment of quarterly dividends of $0.06 per share on common shares in each of June and September 2016, as well as the annual dividend of $0.0195 per share that was paid on shares of preferred stock in March 2017. In October 2016, the Company obtained additional consents from the lenders of the previous Secured Bank Loans and Senior Notes. These consents had the effect of extending the time for delivery of the Company’s first quarter fiscal 2017 quarterly financial information to November 30, 2016 and the Company’s second quarter fiscal 2017 quarterly financial information to December 31, 2016, whereby an event of default was waived as long as those items are delivered within a 30 day grace period after those dates. In addition, the consents also permitted the Company’s payment of a quarterly dividend of $0.06 per share on common shares in December 2016, as well as the annual dividend of $0.0195 per share that was paid on shares of preferred stock in March 2017. In December 2016, the Company obtained additional consents from lenders of the previous Secured Bank Loans and Senior Notes. These consents had the effect of extending the time and delivery of the Company’s first quarter fiscal 2017 quarterly financial information to January 31, 2017.

Derivative Transactions

Derivative Transactions	12 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Derivative Transactions	13. DERIVATIVE TRANSACTIONS The Company uses interest rate swaps and commodity options in the form of collars and swaps to manage its various exposures to interest rate and commodity price fluctuations. For the interest rate swap executed on June 28, 2017, gains and losses resulting from the difference between the spot rate and applicable base rate is recorded in Interest Expense. For collars and commodity swaps, contract settlement gains and losses are recorded in the Consolidated Statements of Operations in Derivative gains and other income, net. Gains and losses related to mark-to-market adjustments for changes in fair value of the derivative contracts are also recorded in the Consolidated Statements of Operations in Derivative gains and other income, net. A summary of the fair values for the various derivatives at March 31, 2018 and 2017 is presented below: 2018 Assets Liabilities (Amounts in thousands) Receivables Other assets Other accrued liabilities Other liabilities Diesel fuel option collars and swaps $ 573 $ 23 $ (78 ) $ (38 ) Interest rate swaps 311 2,490 — — 2017 Assets Liabilities (Amounts in thousands) Receivables Other assets Other accrued liabilities Other liabilities Diesel fuel option collars and swaps $ 149 $ 30 $ (122 ) $ (20 ) The Company recorded net losses and net (gains) on mark-to-market adjustments for changes in the fair value of derivative contracts as well as net losses and net (gains) on the settlement of derivative contracts as follows: Net Unrealized Mark to Market Losses (Gains) (Amounts in thousands) 2018 2017 2016 Interest rate swaps $ (2,801 ) $ (252 ) $ (513 ) Foreign exchange forward contracts — — 28 Diesel fuel option collars (443 ) (2,642 ) (237 ) Propylene swaps — (8,027 ) 2,885 Total net unrealized mark to market losses (gains) $ (3,244 ) $ (10,921 ) $ 2,163 Net Realized Losses (Gains) (Amounts in thousands) 2018 2017 2016 Foreign exchange forward contracts $ — $ — $ (150 ) Diesel fuel option collars (476 ) 1,893 3,142 Propylene swaps — 6,671 11,742 Total net realized losses (gains) $ (476 ) $ 8,564 $ 14,734

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Mar. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	14. COMMITMENTS AND CONTINGENCIES Purchase Commitments The Company secures supplies of resin raw material by agreeing to purchase quantities during a future given period at a fixed price. These purchase contracts typically range from 1 to 12 months and occur in the ordinary course of business. Under such purchase contracts in place at March 31, 2018, the Company has agreed to purchase resin over the period April 2018 through December 2018 at a committed purchase cost of $13.3 million. Litigation On July 29, 2015, a putative stockholder class action, Christopher Wyche, individually and on behalf of all others similarly situated v. Advanced Drainage Systems, Inc., et al. (Case No. 1:15-cv-05955-KPF), was commenced in the U.S. District Court for the Southern District of New York (the “District Court”), naming the Company, along with Joseph A. Chlapaty, the Company’s former Chief Executive Officer, and Mark B. Sturgeon, the Company’s former Chief Financial Officer, as defendants and alleging violations of the federal securities laws. An amended complaint was filed on April 28, 2016. The amended complaint alleged that the Company made material misrepresentations and/or omissions of material fact in its public disclosures during the period from July 25, 2014 through March 29, 2016, in violation of Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, and Rule 10b-5 promulgated thereunder. On March 10, 2017, the District Court dismissed Plaintiff’s claims against all defendants in their entirety and with prejudice. Plaintiff appealed to the United States Court of Appeals for the Second Circuit, and on October 13, 2017 the District Court’s judgment was affirmed by the Second Circuit. On October 27, 2017, Plaintiff filed a petition for rehearing with the Second Circuit. The Second Circuit denied the petition for rehearing on November 28, 2017. The plaintiff did not seek Supreme Court review and therefore the matter is closed. On August 12, 2015, the SEC Division of Enforcement (“Enforcement Division”) informed the Company that it was conducting an informal inquiry with respect to the Company. As part of this inquiry, the Enforcement Division requested the voluntary production of certain documents generally related to the Company’s accounting practices. Subsequent to the initial voluntary production request, the Company received document subpoenas from the Enforcement Division pursuant to a formal order of investigation. The Company has continued to cooperate with the Enforcement Division’s investigation and recently has engaged in discussions with the staff of the Enforcement Division about a potential resolution. As part of settlement discussions the Company has submitted a formal offer of settlement to the Enforcement Division for consideration by the Commission. The terms of the settlement offer remain subject to approval by the Commission. Accordingly, there can be no assurance that the Company’s efforts to resolve the investigation will be successful or that the settlement amount will be as anticipated, and the Company cannot predict the ultimate timing or outcome of the Commission’s consideration. In May 2017, a former employee filed a class action complaint against the Company in Superior Court for the State of California, County of Kern (the “Hayes matter”), alleging that the Company violated certain California wage and hour laws for missed meal and rest periods and other wage and hour claims. In June 2017, the Company removed the case to the United States District Court for the Eastern District of California. The plaintiffs were seeking to recover, on their own behalf and on behalf of a putative class of all non-exempt ADS employees in the State of California from December 16, 2012 through present, damages resulting from missed rest breaks, missed meal periods, unpaid minimum wage, straight-time and overtime pay, improper wage statements, non-payment of wages at termination, and attorneys’ fees and costs. On January 24, 2018, the parties attended mediation and entered into a settlement agreement to resolve the class action for $1.8 million. As part of the parties’ agreement, ADS consented to have the case remanded back to Kern County Superior Court for approval of the class settlement. Thereafter, during the fourth quarter of fiscal 2018, the parties agreed to amend their existing Hayes settlement agreement (i) to expand the settlement class to include temporary employees assigned to work at ADS locations in California and (ii) to increase the settlement amount from $1.8 million to $2.0 million. The parties stipulated to the filing of an Amended Complaint to add a California Private Attorneys General Act (“PAGA”) The Company is involved from time to time in various legal proceedings that arise in the ordinary course of our business, including but not limited to commercial disputes, environmental matters, employee related claims, intellectual property disputes and litigation in connection with transactions including acquisitions and divestitures. The Company does not believe that such litigation, claims, and administrative proceedings will have a material adverse impact on our financial position or our results of operations. The Company records a liability when a loss is considered probable, and the amount can be reasonably estimated.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Mar. 31, 2018
Postemployment Benefits [Abstract]
Employee Benefit Plans	15. EMPLOYEE BENEFIT PLANS Employee Stock Ownership Plan (“ESOP”) - The Company established the Advanced Drainage Systems, Inc. ESOP (the “ESOP” or the “Plan”) effective April 1, 1993. The Plan was funded through a transfer of assets from our tax-qualified profit-sharing retirement plan, as well as a 30-year term loan from ADS. Within 30 days following the repayment of the ESOP loan, which will occur no later than March 2023 the shares of redeemable convertible preferred stock owned by the ESOP will be converted into shares of the Company’s common stock. The Plan operates as a tax-qualified leveraged ESOP and was designed to enable eligible employees to acquire stock ownership interest in ADS. Employees of ADS who have reached the age of 18 are generally eligible to participate in the Plan on March 31 after six months of service. Upon retirement, disability, death, or vested terminations, (i) a participant or designated beneficiary may elect to receive the amount in their account attributable to the 1993 transfer of assets from our tax-qualified profit sharing retirement plan in the form of cash or ADS stock with any fractional shares paid in cash; (ii) stock credited to the participants’ ESOP stock account resulting from the ESOP’s loan repayments are distributed in the form of ADS stock, and (iii) amounts credited to the participants’ ESOP cash account are distributed in the form of cash. Upon attainment of age 50 and seven years of participation in the Plan, a participant may elect to diversify specified percentages of the number of shares of ADS stock credited to the participant’s ESOP stock account in compliance with applicable law. The Company is obligated to make contributions to the Plan, which, when aggregated with the Plan’s dividends on the Plan’s unallocated shares of redeemable convertible preferred stock, equal the amount necessary to enable the Plan to make its regularly scheduled payments of principal and interest due on its term loan to ADS. As the Plan makes annual payments of principal and interest, an appropriate percentage of preferred stock is allocated to ESOP participants’ accounts in accordance with plan terms that are compliant with applicable Internal Revenue Code and regulatory provisions. The carrying 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 Consolidated Balance Sheets. Compensation expense and related dividends paid with ESOP shares for services rendered throughout the period are recognized based upon the annual fair value of the shares allocated. Deferred compensation — unearned ESOP shares is relieved at fair value, with any difference between the annual fair value and the carrying value of shares when allocated being added to Additional paid in capital. The fair value of the shares allocated was $20.00, $16.80, and $16.35 per share of redeemable convertible preferred stock at March 31, 2018, 2017, and 2016, respectively, resulting in an average annual fair value per share of $18.40, $16.58, and $19.20 per share for the fiscal years ended March 31, 2018, 2017, and 2016, respectively. During the fiscal years ended March 31, 2018, 2017, and 2016, the Company recognized compensation expense of $11.7 million, $9.6 million, and $10.3 million, respectively, related to allocation of ESOP shares to participants. Required dividends on allocated shares are generally passed through and paid in cash to the participants and required dividends on unallocated shares are paid in cash to the Plan and generally used to service the Plan’s debt. The ESOP committee directed the Plan trustee to retain dividends on unallocated ADS shares rather than to service the Plan’s debt. In the fiscal years ended March 31, 2018, 2017 and 2016, the Company recognized compensation expense and the trustee retained $3.2 million, $2.9 million and $2.5 million, respectively, for dividends on unallocated ADS shares. These dividends were allocated to participants based on the total shares in their account in relation to total shares allocated at March 31, 2018 and 2017. Redeemable Convertible Preferred Stock - The Trustee of the Company’s ESOP has the ability to put shares of the redeemable convertible preferred stock to the Company absent a market for the Company’s common stock, and as a result the redeemable convertible preferred stock is classified as Mezzanine equity in the Company’s Consolidated Balance Sheets. 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 or its trading has been restricted. Therefore, the holders of Redeemable convertible preferred stock have a put right to require the Company to repurchase such shares in the event that the 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. As of March 31, 2018, the applicable redemption value was $0.781 per share as there were no unpaid cumulative dividends. Given that the event that may trigger redemption of the Redeemable convertible preferred stock (the listing or quotation on a market more senior than the OTC Bulletin Board) is not solely within the Company’s control, the redeemable convertible preferred stock is presented in the mezzanine equity section of the Consolidated Balance Sheets. As of March 31, 2018, the Company did not adjust the carrying value of the redeemable convertible preferred stock to its redemption value or recognize any changes in fair value as the Company did not consider it probable that the Redeemable convertible preferred stock would become redeemable. The Redeemable convertible preferred stock has a required cumulative 2.5% dividend (based on the issue price of $0.781 per share) and is convertible at a rate of 0.7692 shares of common stock for each share of Redeemable convertible preferred stock. ADS guarantees the value of the redeemable convertible preferred stock at $0.781 per share. The Board of Directors approved the 2.5% annual dividend to be paid March 31 of each fiscal year to the stockholders of record as of March 15, 2018, 2017 and 2016. The annual dividend was paid in cash and stock on the allocated shares. During the first quarter of 2018, the Board of Directors approved the 2.5% annual dividend to be paid on March 31, 2018 to stockholders of record as of March 1, 2018. Cash and stock dividends on allocated Redeemable convertible preferred stock for the fiscal years ended March 31, 2018 and 2017, respectively, are summarized in the following table. (Amounts in thousands) 2018 2017 Quarterly cash dividends $ 1,713 $ 1,494 Annual cash dividends 11 18 Total cash dividends $ 1,724 $ 1,512 Annual stock dividend 134 134 Annual cash dividend 11 18 Total ESOP required dividends $ 145 $ 152 Allocated shares 7,437 7,779 Required dividend per share 0.0195 0.0195 Required dividends $ 145 $ 152 In the fiscal years ended March 31, 2018 and 2017, 0.6 million and 0.6 million shares of redeemable convertible preferred stock, respectively, were allocated to the ESOP participants, including, in addition to the cash dividends, less than 0.1 million and less than 0.1 million preferred shares allocated as dividends, respectively. Executive Retirement Expense - ADS has employment agreements with certain executives that include potential payments to be made to those executives upon termination. The terms of the termination payments vary by executive, but are generally based on current base salary and bonus levels at the time of termination. The contractual termination payments vest upon either (1) certain contingent occurrences terminating employment such as death, disability, layoff, the executive voluntarily quitting due to a breach of covenants by the Company or for other “good reason” or (2) the executive reaching a specified retirement age while still working for the Company, as defined in the individual employee agreement. The Company accrues a liability from the effective date of the executive’s employment agreement to the date the executive reaches the required retirement age while working for the Company, which is considered the service period for this obligation. The liability is estimated based on each executive’s current base salary and bonus levels. Because the executives vest in the termination payments equally over the relevant service period, the Company recognizes the related compensation expense based on the straight-line method over the service period. If an executive terminates their employment prior to reaching the required retirement age, no payment is required and the previously-recorded compensation expense for that executive is reversed and recorded as a benefit to compensation expense in the period the executive terminates employment. The compensation expense (benefit) recorded related to the executive termination payments for the fiscal years ended March 31, 2018, 2017, and 2016 was $1.5 million, $1.1 million and $(0.3) million, respectively, and is included in General and administrative expenses in the Consolidated Statements of Operations. As of March 31, 2018 and 2017, the executive termination payment obligation was $6.1 million and $5.1 million, respectively, and is included in Other accrued liabilities and Other liabilities in the Consolidated Balance Sheets. Profit-Sharing Plan - The Company has a tax-qualified profit-sharing retirement plan with a 401(k) feature covering substantially all U.S. eligible employees. The Company did not make employer contributions to this plan in the fiscal years ended March 31, 2018, 2017, and 2016. The Company has a defined contribution postretirement benefit plan covering Canadian employees. The Company recognized costs of $0.7 million, $0.8 million and $0.6 million in the fiscal years ended March 31, 2018, 2017 and 2016.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Mar. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	16. STOCK-BASED COMPENSATION The Company has several programs for stock-based payments to employees and directors, including stock options and restricted stock. Stock-based compensation expense is recorded in General and administrative expenses, Selling expenses and Cost of goods sold in the Consolidated Statements of Operations. The Company recognized stock-based compensation expense (benefit) in the following line items on the Consolidated Statements of Operations for the fiscal years ended March 31, 2018, 2017, and 2016: (Amounts in thousands) 2018 2017 2016 Component of income before income taxes: Cost of goods sold $ 179 $ 177 $ (300 ) Selling expenses 105 177 (500 ) General and administrative expenses 6,837 7,953 (5,068 ) Total stock-based compensation expense (benefit) $ 7,121 $ 8,307 $ (5,868 ) The following table summarizes stock-based compensation expense (benefit) by award type for the fiscal years ended March 31, 2018, 2017, and 2016: (Amounts in thousands) 2018 2017 2016 Stock-based compensation expense (benefit): Liability-classified stock options $ — $ 4,936 $ (6,784 ) Equity-classified stock options 4,148 108 — Restricted stock 1,741 1,945 916 Non-employee director 1,232 1,318 — Total stock-based compensation expense (benefit) $ 7,121 $ 8,307 $ (5,868 ) On April 1, 2017, the Company modified all outstanding awards to remove the provision that permitted employees to satisfy their personal tax liability with the net settlement of shares in excess of minimum tax withholding. Consistent with the ASU in Note 1, employees can now withhold shares with a fair value up to the maximum statutory rate. Accordingly, the Company modified the awards previously accounted for as liability-classified to equity-classified and reclassified the carrying amount of the awards of $13.7 million to Paid-in capital in the Consolidated Balance Sheet. All stock options have been accounted for as equity-classified awards for the periods subsequent to the modification. Prior to the modification, liability-classified awards were reclassified to additional paid in capital at fair value when stock options were exercised. The following table summarizes the assumptions used in estimating the fair value of stock options: 2018 2017 2016 Common stock price $19.35 - $22.95 $18.70 - $28.17 $18.34 - $33.03 Expected stock price volatility 32.1% - 35.6% 29.6% - 33.0% 31.1% - 39.3% Risk-free interest rate 1.9% - 2.2% 0.9% - 1.9% 0.5% - 1.5% Weighted-average expected option life (years) 5.6 – 6.0 0.5 – 5.1 0.5 – 6.2 Dividend yield 1.1% - 1.5% 0.9% 0.9% 2010 and 2013 Stock Options Plans 2000 Plan - The Company’s 2000 stock option plan (“2000 Plan”) provides for the issuance of statutory and non-statutory 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 approximately 10 years from issuance. The Company had no shares available for grant under the 2000 Plan as of March 31, 2018. The stock option activity for the fiscal year ended March 31, 2018 is summarized as follows: (Share amounts in thousands) Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Outstanding at beginning of year 195 $ 13.31 5.4 Granted — — — Exercised (55 ) 11.73 — Forfeited (5 ) 15.74 — Outstanding at end of year 135 13.85 4.8 Vested at end of year 81 12.61 4.1 Unvested at end of year 54 15.74 6.0 Fair value of options granted during the year $ — All outstanding options are expected to vest. The following table summarizes information about the unvested stock option grants as of the fiscal year ended March 31, 2018: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 59 $ 6.76 Granted — — Vested — — Forfeitures (5 ) 6.76 Unvested at end of year 54 $ 6.76 As of March 31, 2018, there was a total of $0.2 million of unrecognized compensation expense related to unvested stock option awards under the 2000 plan that will be recognized as an expense as the awards vest over the remaining weighted average service period of 3.3 years. No options vested during the fiscal years ended March 31, 2018, 2017 and 2016. No options were granted during the fiscal years ended March 31, 2018, 2017 and 2016. The aggregate intrinsic value for options outstanding and currently exercisable as of March 31, 2018 was $1.6 million and $1.1 million, respectively. The total intrinsic value of options exercised during the fiscal years ended March 31, 2018, 2017, and 2016 were $0.5 million, $3.7 million and $3.7 million, respectively. 2013 Plan - The Company’s 2013 stock option plan (“2013 Plan”) provides for the issuance of non-statutory 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 generally vest in three to five equal annual amounts beginning in year one and expire after approximately 10 years from issuance. Options issued to the former Chief Executive Officer vested equally over four years and expire after approximately 10 years from issuance. The Company had no shares available for grant under the 2013 Plan as of March 31, 2018. The stock option activity for the fiscal year ended March 31, 2018 is summarized as follows: (Share amounts in thousands) Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Outstanding at beginning of year 2,260 $ 16.04 6.7 Granted 3 22.95 — Exercised (618 ) 13.65 — Forfeited (143 ) 24.20 — Outstanding at end of year 1,502 16.27 5.9 Vested at end of year 1,063 15.10 5.4 Unvested at end of year 439 19.09 6.5 Fair value of options granted during the year $ 7.53 All outstanding options are expected to vest. The following table summarizes information about the unvested stock option grants as of the fiscal year ended March 31, 2018: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 1,120 $ 8.51 Granted 3 7.53 Vested (541 ) 8.76 Forfeited (143 ) 7.99 Unvested at end of year 439 $ 8.42 As of March 31, 2018, there was a total of $2.4 million of unrecognized compensation expense related to unvested stock option awards under the 2013 Plan that will be recognized as an expense as the awards vest over the remaining weighted average service period of 1.5 years. The aggregate intrinsic value for options outstanding and currently exercisable as of March 31, 2018 was $14.5 million and $11.4 million, respectively. The total fair value of options that vested during the fiscal years ended March 31, 2018, 2017, and 2016 were $4.7 million, $3.4 million, and $3.6 million, respectively. The total intrinsic value of options exercised during the fiscal year ended March 31, 2018 was $4.4 million. 2008 Restricted Stock Plan On September 16, 2008, the Board of Directors adopted the restricted stock plan, which provides for the issuance of restricted stock awards to certain key employees. The restricted stock generally vest ratably over a five-year period from the original restricted stock grant date, contingent on the employee’s continuous employment by ADS. In certain instances, however, a portion of the grants vested immediately or for accounting purposes were deemed to have vested immediately, including the grants to the former Chief Executive Officer, which do not have a substantial risk of forfeiture as a result of different vesting provisions. Under the restricted stock plan, vested shares 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 non-forfeited shares. The restricted stock is accounted for as equity-classified awards. The fair value of restricted stock is based on the fair value of the Company’s common stock. Compensation expense is recognized on a straight-line basis over the employee’s requisite service period, which is generally the vesting period of the grant. The Company had no shares available for grant under this plan as of March 31, 2018. The information about the unvested restricted stock grants as of March 31, 2018 is as follows: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 254 $ 21.92 Granted 1 22.15 Vested (151 ) 21.25 Forfeited (3 ) 22.49 Unvested at end of year 101 $ 22.95 The Company expects all restricted stock grants to vest. At March 31, 2018, there was approximately $1.9 million of unrecognized compensation expense related to the restricted stock that will be recognized over the weighted average remaining service period of 1.7 years. During the fiscal year ended March 31, 2018 and 2017, the weighted average grant date fair value of restricted stock granted was $22.15 and $24.20, respectively. No restricted stock was granted during the fiscal year ended March 31, 2016. During the fiscal years ended March 31, 2018, 2017, and 2016, the total fair value of restricted stock that vested was $2.9 million, $1.2 million and $1.1 million, respectively. 2017 Omnibus Plan On May 24, 2017, the Board of Directors approved the 2017 Omnibus Incentive Plan (the “2017 Incentive Plan”) which was approved by the Company’s stockholders on July 17, 2017. The 2017 Incentive Plan provides for the issuance of a maximum of 3.5 million shares of the Company’s common stock for awards made thereunder, which awards may consist of stock options, restricted stock, restricted stock units, stock appreciation rights, phantom stock, cash-based awards, performance awards (which may take the form of performance cash, performance units or performance shares) or other stock-based awards. The Company had approximately 3.3 million shares available for awards as of March 31, 2018. The 2017 Incentive Plan replaces the 2000 Incentive Stock Option Plan, 2008 Restricted Stock Plan, 2013 Stock Option Plan, and 2014 Non-Employee Director Compensation Plan (the “Prior Plans”) and no further grants will be made under the prior plans. The stock option activity for the fiscal year ended March 31, 2018 is summarized as follows: (Share amounts in thousands) Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Outstanding at beginning of year — — — Granted 198 $ 19.75 — Exercised — — — Forfeited — — — Outstanding at end of year 198 19.75 9.4 Vested at end of year — — — Unvested at end of year 198 19.75 9.4 Fair value of options granted during the year 5.94 The following table summarizes information about the unvested stock option grants as of the fiscal year ended March 31, 2018: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year — — Granted 198 $ 5.94 Vested — — Forfeited — — Unvested at end of year 198 $ 5.94 The aggregate intrinsic value for options outstanding as of March 31, 2018 was $1.2 million. There were no options that vested or were exercised during the fiscal year ended March 31, 2018. The information about the unvested restricted stock grants as of March 31, 2018 is as follows: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year — $ — Granted 108 19.91 Vested — — Forfeited — — Unvested at end of year 108 $ 19.91 At March 31, 2018, there was approximately $1.2 million of unrecognized compensation expense related to the restricted stock that will be recognized over the weighted average remaining service period of 2.4 years. During the fiscal year ended March 31, 2018, the weighted average grant date fair value of restricted stock granted was $19.91. During the fiscal year ended March 31, 2018, no restricted stock vested. Non-Employee Director Compensation Plan On June 18, 2014, the Company amended its then-existing Stockholders’ Agreement to authorize 0.3 million shares of restricted stock to be granted to non-employee members of its Board of Directors. The shares typically will 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. The Company has determined that the restricted stock granted to directors should be accounted for as equity-classified awards. The Company had no shares available for grant under this plan as of March 31, 2018. The following table summarizes information about the unvested Non-Employee Director Compensation stock grants as of March 31, 2018 : 2018 (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 40 $ 24.20 Granted — — Vested (40 ) — Unvested at end of year — $ — As of March 31, 2018, there was no unrecognized compensation expense.

Income Taxes

Income Taxes	12 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	17. INCOME TAXES The components of Income before income taxes for the fiscal years ended March 31 are as follows: (Amounts in thousands) 2018 2017 2016 United States $ 72,109 $ 59,543 $ 45,159 Foreign 4,833 5,288 14,140 Total $ 76,942 $ 64,831 $ 59,299 The components of Income tax expense for the fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 2016 Current: Federal $ 17,107 $ 24,318 $ 6,889 State and local 3,541 4,652 2,126 Foreign 2,242 3,040 3,791 Total current tax expense 22,890 32,010 12,806 Deferred: Federal (11,236 ) (5,887 ) 10,019 State and local (55 ) (1,297 ) 1,431 Foreign (188 ) (211 ) (758 ) Total deferred tax expense (benefit) (11,479 ) (7,395 ) 10,692 Total Income tax expense $ 11,411 $ 24,615 $ 23,498 For the fiscal years ended March 31, the effective tax rate varied from the statutory Federal income tax rate as a result of the following factors: 2018 2017 2016 Federal statutory rate 31.5 % 35.0 % 35.0 % ESOP stock appreciation 5.4 4.1 5.0 Effect of tax rate of foreign subsidiaries 0.7 1.3 0.8 State and local taxes—net of federal income tax benefit 3.6 4.1 4.3 Stock-based compensation 0.5 0.3 (1.8 ) Uncertain tax position change 0.3 (1.1 ) (3.6 ) Impact of tax reform (19.4 ) — — Return to provision - federal and state (5.0 ) 1.1 — Qualified production activity deduction (2.5 ) (3.3 ) (0.9 ) Closure of Puerto Rico — (4.2 ) — Other (0.3 ) 0.7 0.8 Effective rate 14.8 % 38.0 % 39.6 % The Tax Cuts and Jobs Act (the “Tax Act”) was enacted on December 22, 2017. The Tax Act significantly revises the future ongoing U.S. corporate income tax by, among other things, lowering the U. S. corporate income tax rate from 35% to 21%, full expensing on qualified property, eliminates the domestic manufacturing deduction and implements a territorial tax system. The 21% U.S. corporate income tax rate is effective January 1, 2018. Based on the Company’s fiscal year end of March 31, the U.S. statutory federal rate is 31.5% for the fiscal year ended March 31, 2018. The Company has recognized the provisional tax impacts related to revaluation of deferred tax assets and liabilities and deemed repatriated earnings and included these amounts in its financial statements for the year ended March 31, 2018. The ultimate impact may differ from these provisional amounts, possibly materially, due to, among other things, additional analysis, changes in interpretations and assumptions the Company has made, additional regulatory guidance that may be issued, and actions the Company may take as a result of the Tax Act. The accounting is expected to be finalized when the fiscal 2018 U.S. corporate income tax return is filed. The Company recognized an initial provisional amount for revaluing its deferred tax attributes resulting in a $14.7 million tax benefit for the quarter ended December 31, 2017. On the basis of revised computations during the fourth quarter, we recognized an additional deferred tax benefit of $1.3 million for the quarter ended March 31, 2018. A total deferred tax benefit of $16.0 million was recorded for the fiscal year ended March 31, 2018. The Company had an estimated $33.2 million of undistributed earnings on its foreign subsidiaries subject to the deemed mandatory repatriation. The Company recognized an initial provisional $4.4 million of income tax expense for the quarter ended December 31, 2017. After the utilization of existing foreign tax credits, the Company expected to pay additional U.S. federal taxes of approximately $0.9 million on the deemed mandatory repatriation as of the quarter ended December 31, 2017. On the basis of revised undistributed earnings computations that were calculated during the fourth quarter, we recognized an additional measurement-period adjustment of $0.8 million to income tax expense for the quarter ended March 31, 2018. A total transition tax expense of $5.2 million has been recorded for the fiscal year ended March 31, 2018. After the utilization of existing foreign tax credits, the Company expects to pay additional U.S. federal cash taxes of approximately $1.0 million as of the fiscal year ended March 31, 2018. These undistributed earnings are intended to be reinvested indefinitely with the exception of cash dividends paid by our ADS Mexicana joint venture. It is not practicable to estimate the amount of U.S. tax, in addition to the repatriation amount, that might be payable on the eventual remittance of such earnings. The tax effect of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at March 31 were comprised of: (Amounts in thousands) 2018 2017 Deferred tax assets: State income taxes $ 1,126 $ 1,474 ESOP loan repayment 891 1,363 Receivable and other allowances 1,696 2,660 Inventory 3,558 5,820 Non-qualified stock options 3,596 6,052 Executive termination payments (Note 15) 1,299 2,044 Worker’s compensation 732 1,323 Foreign net operating losses 445 2,223 Other 2,441 3,359 Total deferred tax assets 15,784 26,318 Less: valuation allowance (26 ) (2,223 ) Total net deferred tax assets 15,758 24,095 Deferred tax liabilities: Intangible assets 4,254 9,728 Property, plant and equipment 38,181 52,322 Goodwill 3,698 3,886 Other 1,814 1,464 Total deferred tax liabilities 47,947 67,400 Net deferred tax liability $ 32,189 $ 43,305 Net deferred tax assets and liabilities are included in Other assets and Deferred tax liabilities, respectively, on the Consolidated Balance Sheets. The related balances at March 31 were as follows: (Amounts in thousands) 2018 2017 Net non-current deferred tax assets $ 115 $ 702 Net non-current deferred tax liabilities 32,304 44,007 Accounting for Uncertain Tax Positions As of March 31, 2018, the Company had unrecognized tax benefit of $7.6 million, which if resolved favorably, would reduce income tax expense by $7.6 million. A reconciliation of the beginning and ending amounts of unrecognized tax benefits for the years ended March 31, 2018, 2017, and 2016 is as follows: (Amounts in thousands) 2018 2017 2016 Balance at beginning of year $ 6,196 $ 7,998 $ 10,452 Tax positions taken in current year 81 — 917 Decreases in tax positions for prior years — (1,786 ) (599 ) Increases in tax positions for prior years 5,108 80 358 Lapse of statute of limitations (3,940 ) (96 ) (3,130 ) Foreign translation adjustment 148 — — Balance at end of year $ 7,593 $ 6,196 $ 7,998 The unrecognized tax benefits are primarily recorded in Other liabilities in the Company’s Consolidated Balance Sheets. These amounts include potential accrued interest and penalties of $2.1 million and $1.8 million at March 31, 2018 and 2017, respectively. It is reasonably possible that there could be a change in the amount of unrecognized tax benefits within the next twelve months due to activities of the IRS or other taxing authorities, including proposed assessments of additional tax, possible settlement of audit issues, or the expiration of applicable statutes of limitation. The Company is currently open to audit under the statute of limitations by the IRS for the fiscal years ended March 31, 2015 through March 31, 2018. The majority of the Company’s state income tax returns are open to audit under the statute of limitations for the years ended March 31, 2014 through March 31, 2018. The foreign income tax returns are open to audit under the statute of limitations for the years ended March 31, 2014 through March 31, 2018.

Net Income Per Share and Stockh

Net Income Per Share and Stockholders' Equity	12 Months Ended
	Mar. 31, 2018
Net Income Per Share And Stockholders Equity [Abstract]
Net Income Per Share and Stockholders' Equity	18. NET INCOME PER SHARE AND STOCKHOLDERS’ EQUITY Basic net income per share is calculated by dividing the Net income available 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 available to common stockholders by the weighted-average number of common stock equivalents outstanding for the period. Holders of unvested restricted stock have non-forfeitable 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 stockholders 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. 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 March 31, 2018, 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 fiscal years ended March 31, 2018, 2017, and 2016, 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: (Amounts in thousands, except per share data) 2018 2017 2016 NET INCOME PER SHARE — BASIC: Net income attributable to ADS $ 62,007 $ 32,950 $ 25,052 Adjustment for: Accretion of redeemable noncontrolling interest in subsidiaries — (1,560 ) (932 ) Dividends paid to redeemable convertible preferred stockholders (1,858 ) (1,646 ) (1,425 ) Dividends paid to unvested restricted stockholders (49 ) (73 ) (24 ) Net income available to common stockholders and participating securities 60,100 29,671 22,671 Undistributed income allocated to participating securities (4,514 ) (1,700 ) (1,270 ) Net income available to common stockholders — Basic 55,586 27,971 21,401 Weighted average number of common shares outstanding — Basic 55,696 54,919 53,978 Net income per common share — Basic $ 1.00 $ 0.51 $ 0.40 NET INCOME PER SHARE — DILUTED: Net income available to common stockholders — Diluted 55,586 27,971 21,401 Weighted average number of common shares outstanding — Basic 55,696 54,919 53,978 Assumed exercise of stock options 638 705 1,198 Weighted average number of common shares outstanding — Diluted 56,334 55,624 55,176 Net income per common share — Diluted $ 0.99 $ 0.50 $ 0.39 Potentially dilutive securities excluded as anti- dilutive 6,167 6,228 6,383 Stockholders’ Equity – During the fiscal year ended March 31, 2018, the Company repurchased 0.4 million shares of common stock at a cost of $7.9 million. The repurchases were made under the Board of Directors’ authorization in February 2017 to repurchase up to $50 million of ADS common stock in accordance with applicable securities laws. As of March 31, 2018, approximately $42.1 million of common stock may be repurchased under the authorization. The repurchase program does not obligate the Company to acquire any particular amount of common stock, and may be suspended or terminated at any time at the Company’s discretion. Treasury Stock Retirement – On November 1, 2017, the Board of Directors resolved to retire 97.7 million shares of Treasury Stock. The retirement of the Treasury Stock resulted in a reclassification of Treasury stock to Paid-In-Capital and did not have an impact on Total Stockholders’ Equity.

Other Accrued Liabilities

Other Accrued Liabilities	12 Months Ended
	Mar. 31, 2018
Payables And Accruals [Abstract]
Other Accrued Liabilities	19. OTHER ACCRUED LIABILITIES Other accrued liabilities as of fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 Accrued compensation and benefits (1) $ 17,980 $ 17,066 Accrued rebate liability (2) 12,938 8,480 Self-insurance accruals 12,439 8,559 Current portion of liability-classified stock-based awards — 11,926 Other 17,203 20,355 Total accrued liabilities $ 60,560 $ 66,386 (1) Accrued compensation and benefits is primarily comprised of accrued payroll, bonuses and commissions. (2) Accrued rebate liability represents the Company’s estimated rebates to be paid to customers.

Business Segment Information

Business Segment Information	12 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Business Segment Information	20. BUSINESS SEGMENT INFORMATION ADS operates its business in two distinct operating and reportable segments based on the markets it serves: “Domestic” and “International.” The Chief Operating Decision Maker (“CODM”) evaluates segment reporting based on Net sales and Segment Adjusted EBITDA. The Company calculates Segment Adjusted EBITDA as net income or loss before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other expenses. Domestic The Company’s Domestic segment manufactures and markets products throughout the United States. The Company maintains and serves these markets through 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. The Company also sells through a broad variety of buying groups and co-ops in the United States. Products include single wall pipe, N-12 HDPE pipe sold into the Storm sewer and Infrastructure markets, 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. The Company’s Domestic segment sales are diversified across all regions of the country. International The Company’s International segment manufactures and markets products in certain regions outside of the United States, with a growth strategy focused on Company owned facilities in Canada, subsidiaries that distribute to Europe and the Middle East, exports and through the Company’s joint-ventures with local partners in Mexico and South America. The Company’s joint venture strategy provides it with local and regional access to new markets such as Brazil, Chile, Argentina, Peru and Colombia. The Company’s Mexican joint venture (ADS Mexicana) primarily serves the Mexican and Central American markets, while its South American Joint Venture (Tigre-ADS) is the primary channel to serve the South American markets. The Company’s International product line includes single wall pipe, N-12 HDPE pipe, and 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 in each of the fiscal years ended March 31: (Amounts in thousands) 2018 2017 2016 Domestic Pipe $ 835,421 $ 786,546 $ 812,071 Allied Products 339,011 315,690 301,725 Total domestic 1,174,432 1,102,236 1,113,796 International Pipe 118,644 122,384 139,731 Allied Products 37,278 32,641 37,151 Total international 155,922 155,025 176,882 Total net sales $ 1,330,354 $ 1,257,261 $ 1,290,678 The following sets forth certain additional financial information attributable to the reportable segments for the fiscal years ended March 31 . (Amounts in thousands) 2018 2017 2016 Segment Adjusted EBITDA Domestic $ 191,629 $ 175,676 $ 162,875 International 18,601 17,695 24,465 Total $ 210,230 $ 193,371 $ 187,340 Interest expense Domestic $ 14,929 $ 17,049 $ 17,908 International 333 418 552 Total $ 15,262 $ 17,467 $ 18,460 Income tax expense Domestic $ 9,199 $ 21,786 $ 20,465 International 2,212 2,829 3,033 Total $ 11,411 $ 24,615 $ 23,498 Depreciation and amortization Domestic $ 66,978 $ 63,747 $ 62,625 International 8,025 8,608 8,384 Total $ 75,003 $ 72,355 $ 71,009 Equity in net (loss) income of unconsolidated affiliates Domestic $ (2,427 ) $ (505 ) $ 181 International 1,688 (3,803 ) (5,415 ) Total $ (739 ) $ (4,308 ) $ (5,234 ) Capital expenditures Domestic $ 39,562 $ 39,642 $ 37,242 International 2,147 7,034 7,700 Total $ 41,709 $ 46,676 $ 44,942 The following sets forth certain additional financial information attributable to the reportable segments as of March 31: (Amounts in thousands) 2018 2017 Investments in unconsolidated affiliates Domestic $ — $ 2,427 International 12,343 6,559 Total $ 12,343 $ 8,986 Total identifiable assets Domestic $ 904,718 $ 917,006 International 142,822 134,987 Eliminations (4,298 ) (5,708 ) Total $ 1,043,242 $ 1,046,285 Reconciliation of Segment Adjusted EBITDA to Net income 2018 2017 2016 (Amounts in thousands) Domestic International Domestic International Domestic International Net income (loss) $ 57,279 $ 7,513 $ 35,118 $ 790 $ 24,875 $ 5,692 Depreciation and amortization 66,978 8,025 63,747 8,608 62,625 8,384 Interest expense 14,929 333 17,049 418 17,908 552 Income tax expense 9,199 2,212 21,786 2,829 20,465 3,033 Derivative fair value adjustments (443 ) — (10,921 ) — 2,139 24 Foreign currency transaction (gains) losses — (1,748 ) — (1,629 ) — 697 Loss (gain) on disposal of assets and costs from exit and disposal activities 14,248 755 4,793 3,716 892 (80 ) Unconsolidated affiliates interest, taxes, depreciation and amortization (a) 1,181 1,511 1,088 1,663 1,052 2,163 Contingent consideration remeasurement 39 — (265 ) — 371 — Stock-based compensation expense (benefit) 7,121 — 8,307 — (5,868 ) — ESOP deferred stock-based compensation 11,724 — 9,568 — 10,250 — Executive retirement expense (benefit) 1,473 — 1,092 — (294 ) — Loss related to BaySaver step acquisition — — — — 490 — Inventory step up related to PTI acquisition — — 525 — — — Bargain purchase gain on PTI acquisition — — (609 ) — — — Restatement-related costs (b) 4,227 — 24,026 — 27,970 — Legal settlement (c) 2,000 — — — — — Impairment on investment in unconsolidated affiliate (d) 312 — — 1,300 — 4,000 Transaction costs (e) 1,362 — 372 — — — Segment Adjusted EBITDA (f) $ 191,629 $ 18,601 $ 175,676 $ 17,695 $ 162,875 $ 24,465 (a) Includes the Company’s proportional share of interest, income taxes, depreciation and amortization related to its South American Joint Venture and its Tigre-ADS USA Joint Venture, which are accounted for under the equity method of accounting. In addition, these amounts include the Company’s proportional share of interest, income taxes, depreciation and amortization related to its BaySaver Joint Venture prior to the step acquisition of BaySaver on July 17, 2015, which was previously accounted for under the equity method of accounting. (b) Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with the restatement of the prior period financial statements as reflected in the fiscal year 2015 Form 10-K and fiscal year 2016 Form 10-K/A. (c) Represents settlement agreement to resolve the Hayes matter, as further discussed in “Note 14. Commitments and Contingencies” to the Consolidated Financial Statements. (d) Represents an other-than-temporary impairment of our investments in Tigre-ADS USA and the South American Joint Venture. (e) Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with the debt refinancing and asset acquisitions and dispositions. (f) A portion of the reduction in International Adjusted EBITDA from fiscal 2016 to fiscal 2017 is related to transfer pricing. The reduction is fully offset by an increase in Domestic Adjusted EBITDA. Geographic Sales and Assets Information Net sales are attributed to the geographic location based on the location of the customer. The table below represents the Net sales and long-lived asset information by geographic location for each of the fiscal years ended March 31: (Amounts in thousands) 2018 2017 2016 Net Sales North America $ 1,313,917 $ 1,243,074 $ 1,274,700 Other 16,437 14,187 15,978 Total $ 1,330,354 $ 1,257,261 $ 1,290,678 (Amounts in thousands) 2018 2017 Long-Lived Assets (a) North America $ 401,470 $ 411,752 Other 12,343 6,559 Total $ 413,813 $ 418,311 (a) For segment reporting purposes, long-lived assets include Investments in unconsolidated affiliates, Central parts and Property, plant and equipment.

Supplemental Disclosures of Cas

Supplemental Disclosures of Cash Flow Information	12 Months Ended
	Mar. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosures of Cash Flow Information	21. SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION Supplemental disclosures of cash flow information for the fiscal years ended March 31 were as follows: (Amounts in thousands) 2018 2017 2016 Supplemental disclosures of cash flow information — cash paid during years: Interest $ 17,890 $ 17,273 $ 18,352 Income taxes 24,510 13,525 32,175 (Amounts in thousands) 2018 2017 2016 Supplemental disclosures of noncash investing and financing activities: Redeemable convertible preferred stock dividend $ 134 $ 134 $ 132 Purchases of plant, property, and equipment included in accounts payable 1,258 2,549 1,165 Receivable recorded for sale of businesses — — 150 ESOP distributions in common stock 11,566 7,425 10,250 Assets acquired and obligation incurred under capital lease 26,571 26,276 34,207 Lease obligation retired upon disposition of leased assets 636 390 134 Reclassification of liability-classified stock options and restricted stock to equity — 4,147 3,702 Contribution of net accounts receivable to the South American Joint Venture 2,785 — — Payable recorded for business acquisition 300 950 —

Quarterly Financial Information

Quarterly Financial Information (Unaudited)	12 Months Ended
	Mar. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information (Unaudited)	22. QUARTERLY FINANCIAL INFORMATION (UNAUDITED) The following tables set forth certain historical unaudited consolidated condensed quarterly financial information for each of the quarters during the years ended March 31, 2018 and 2017. In the Company’s opinion, the unaudited quarterly financial information reflects all normal and recurring accruals and adjustments necessary for a fair presentation of net income for interim periods. Fiscal Year 2018 For the Three Months Ended (in thousands, except per share amounts) March 31, 2018 December 31, 2017 September 30, 2017 June 30, 2017 Net sales $ 250,114 $ 320,832 $ 401,049 $ 358,359 Gross profit 48,115 77,826 89,801 86,739 Net (loss) income (4,856 ) 33,215 17,959 18,474 Net (loss) income attributable to ADS (5,703 ) 32,105 17,863 17,742 Net (loss) income per share Basic (1) $ (0.11 ) $ 0.52 $ 0.29 $ 0.29 Diluted (1) $ (0.11 ) $ 0.51 $ 0.29 $ 0.28 Fiscal Year 2017 For the Three Months Ended (in thousands, except per share amounts) March 31, 2017 December 31, 2016 September 30, 2016 June 30, 2016 Net sales $ 244,184 $ 294,716 $ 360,785 $ 357,576 Gross profit 39,251 69,441 90,512 96,606 Net (loss) income (18,052 ) 10,258 24,281 19,421 Net (loss) income attributable to ADS (18,110 ) 9,053 23,734 18,273 Net (loss) income per share Basic (1) $ (0.34 ) $ 0.14 $ 0.38 $ 0.29 Diluted (1) $ (0.34 ) $ 0.14 $ 0.38 $ 0.29 (1) The earnings per share calculations for each quarter are based upon the applicable weighted average shares outstanding for each period and may not necessarily be equal to the full year share amount.

Subsequent Events

Subsequent Events	12 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	23. SUBSEQUENT EVENTS Dividends on Common Stock - During the first quarter of fiscal 2019, the Company declared a quarterly cash dividend of $0.08 per share of common stock. The dividend is payable on June 15, 2018 to stockholders of record at the close of business on June 5, 2018.

Schedule II - Consolidated Valu

Schedule II - Consolidated Valuation and Qualifying Accounts	12 Months Ended
	Mar. 31, 2018
Valuation And Qualifying Accounts [Abstract]
Schedule II - Consolidated Valuation and Qualifying Accounts	SCHEDULE II ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES Consolidated Valuation and Qualifying Accounts for the Fiscal Years Ended March 31, 2018, 2017 and 2016 (in thousands): Allowance for Doubtful Accounts: Year ended March 31, Balance at beginning of period Charged to costs and expenses Charged to other accounts (1) Deductions (2) Balance at end of period 2018 $ 10,431 $ 503 $ (391 ) $ (3,717 ) $ 6,826 2017 7,956 2,940 (13 ) (452 ) 10,431 2016 5,423 3,542 (81 ) (928 ) 7,956 (1) Amounts represent the impact of foreign currency translation. (2) Amounts includes the release of a $3.0 million allowance related to the South American Joint Venture capital contribution. See “Note 10. Investment in Unconsolidated Affiliates” for additional information.

Background and Summary of Sig33

Background and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation - The consolidated financial statements include the Company, its wholly owned subsidiaries, its majority owned subsidiaries, and variable interest entities (“VIEs”) of which the Company is the primary beneficiary. The Company uses the equity method of accounting for equity investments where it exercises significant influence but does not hold a controlling financial interest. Such investments are recorded in Other assets in the Consolidated Balance Sheets and the related equity in earnings from these investments are included in Equity in net loss of unconsolidated affiliates in the Consolidated Statements of Operations. All intercompany balances and transactions have been eliminated in consolidation.
Estimates	Estimates - The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingencies and liabilities at the balance sheet date and the reported amounts of revenues and expenses during the reporting period. Significant estimates include, but are not limited to, the allowance for doubtful accounts, valuation of inventory, useful lives of property, plant and equipment and amortizing intangible assets, determination of the proper accounting for leases, valuation of equity method investments, goodwill, intangible assets and other long-lived assets for impairment, accounting for stock-based compensation and the ESOP, valuation of the redeemable convertible preferred stock, determination of allowances for sales returns, rebates and discounts, determination of the valuation allowance, if any, on deferred tax assets, and reserves for uncertain tax positions. 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.
Receivables and Allowance for Doubtful Accounts	Receivables and Allowance for Doubtful Accounts - Receivables include trade receivables, net of an allowance for doubtful accounts, and other miscellaneous receivables. Receivables at March 31, 2018 and 2017 are as follows: (Amounts in thousands) 2018 2017 Trade receivables $ 159,291 $ 160,655 Other miscellaneous receivables 12,670 8,288 Receivables $ 171,961 $ 168,943 As of March 31, 2018 and 2017, Other miscellaneous receivables includes an insurance recoverable of approximately $3.4 million and $2.4 million, respectively, which has a corresponding liability recorded in Other accrued liabilities. Credit is extended to customers based on an evaluation of their financial condition and collateral is generally not required. The evaluation of the customer’s financial condition is performed to reduce the risk of loss. Accounts receivable are evaluated for collectability based on numerous factors, including the length of time individual receivables are past due, past transaction history with customers, their credit worthiness and the economic environment. This estimate is periodically adjusted when management becomes aware of a specific customer’s inability to meet its financial obligations (e.g., bankruptcy filing) or as a result of changes in historical collection patterns.
Inventories	Inventories - Inventories are stated at the lower of cost or net realizable value. The Company’s inventories are maintained on the first-in, first-out (“FIFO”) method. Costs include the cost of acquiring materials, including in-bound freight from vendors and freight incurred for the transportation of raw materials, tooling or finished goods between the Company’s manufacturing plants and its distribution centers, direct and indirect labor, factory overhead and certain corporate overhead costs related to the production of inventory. The portion of fixed manufacturing overhead that relates to capacity in excess of our normal capacity is expensed in the period in which it is incurred and is not included in inventory. Net realizable value of inventory is established with consideration given to deterioration, obsolescence, and other factors. The Company periodically evaluates the carrying value of inventories and adjustments are made whenever necessary to reduce the carrying value to net realizable value.
Property, Plant and Equipment and Depreciation Method	Property, Plant and Equipment and Depreciation Method - Property, plant and equipment are recorded at cost less accumulated depreciation, with the exception of assets acquired through acquisitions, which are initially recorded at fair value. Equipment acquired under capital lease is recorded at the lower of fair market value or the present value of the future minimum lease payments. Depreciation is computed for financial reporting purposes using the straight-line method over the estimated useful lives of the related assets or the lease term, if shorter, as follows: Years Buildings and leasehold improvement 20 — 45 or the lease term if shorter Machinery and equipment 3 — 18 Costs of additions and major improvements are capitalized, whereas maintenance and repairs that do not improve or extend the life of the asset are charged to expense as incurred. When assets are retired or disposed, the cost and related accumulated depreciation are removed from the asset accounts and any resulting gain or loss is reflected in Loss on disposal of assets and costs from exit and disposal activities in our Consolidated Statements of Operations. Construction in progress is also recorded at cost and includes capitalized interest, capitalized payroll costs and related costs such as taxes and other fringe benefits. Interest capitalized was $0.6 million, $0.6 million, and $0.4 million during the fiscal years ended March 31, 2018, 2017, and 2016, respectively.
Goodwill	Goodwill - The Company records acquisitions resulting in the consolidation of an enterprise using the acquisition method of accounting. Under this method, the Company records the assets acquired, including intangible assets that can be identified, and liabilities assumed based on their estimated fair values at the date of acquisition. The purchase price in excess of the fair value of the identifiable assets acquired and liabilities assumed is recorded as goodwill. Goodwill is reviewed annually for impairment as of March 31 or whenever events or changes in circumstances indicate the carrying value may be greater than fair value. The goodwill impairment analysis is comprised of two steps. The first step requires the comparison of the fair value of the applicable reporting unit to its respective carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that unit, goodwill is not considered impaired and the Company is not required to perform further testing. If the carrying value of the net assets assigned to the reporting unit exceeds the fair value of the reporting unit, then the Company must perform the second step of the impairment test in order to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of a reporting unit’s goodwill exceeds its implied fair value, then the Company would record an impairment loss equal to the difference. With respect to this testing, a reporting unit is a component of the Company for which discrete financial information is available and regularly reviewed by management. Implied fair value of goodwill is determined by considering both the income and market approach. Determining the fair value of a reporting unit is judgmental in nature and involves the use of significant estimates and assumptions. These estimates and assumptions include revenue growth rates and operating margins used to calculate projected future cash flows, risk-adjusted discount rates, future economic and market conditions, and determination of appropriate market comparables. The fair value estimates are based on assumptions management believes to be reasonable, but are inherently uncertain. For the fiscal 2018, ADS completed a quantitative fair value assessment of the International reporting unit and determined no impairment charge was required. GAAP allows entities testing goodwill for impairment the option of performing a qualitative assessment before calculating the fair value of a reporting unit for the goodwill impairment test. If the qualitative assessment is performed, an entity is no longer required to calculate the fair value of a reporting unit unless the entity determines that, based on that assessment, it is more likely than not that its fair value is less than its carrying amount. ADS completed a quantitative fair value measurement of the Domestic reporting unit in fiscal 2016. The test indicated that the fair value of the Domestic reporting unit exceeded the carrying value, indicating that no impairment existed. ADS applied the qualitative assessment to the Domestic reporting unit for the annual impairment test performed as of March 31, 2018 and 2017. For the current year test, ADS assessed various assumptions, events and circumstances that would have affected the estimated fair value of the reporting unit as compared to its March 31, 2016 quantitative fair value measurement. The results of this assessment indicated that it is not more likely than not that the reporting unit fair value is less than the reporting unit carrying value. The Company did not incur any impairment charges for goodwill in the fiscal years ended March 31, 2018, 2017, and 2016.
Intangible Assets - Definite-Lived	Intangible Assets — Definite-Lived - Definite-lived intangible assets are amortized using the straight-line method over their estimated useful lives, and are tested for recoverability whenever events or changes in circumstances indicate that carrying amounts of the asset group may not be recoverable. Asset groups are established primarily by determining the lowest level of cash flows available. If the estimated undiscounted future cash flows are less than the carrying amounts of such assets, an impairment loss is recognized to the extent the fair value of the asset less any costs of disposition is less than the carrying amount of the asset. Determining the fair value of these assets is judgmental in nature and involves the use of significant estimates and assumptions.
Intangible Assets - Indefinite-Lived	Intangible Assets — Indefinite-Lived - 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. Determining the fair value of these assets is judgmental in nature and involves the use of significant estimates and assumptions. The Company bases its fair value estimates on assumptions it believes to be reasonable, but that are inherently uncertain. To estimate the fair value of these indefinite-lived intangible assets, the Company uses an income approach, which utilizes a market derived rate of return to discount anticipated performance. An impairment loss is recognized when the estimated fair value of the intangible asset is less than the carrying value. GAAP allows entities testing indefinite-lived intangible assets for impairment the option of performing a qualitative assessment before calculating the fair value of the indefinite-lived intangible assets for the impairment test. If the qualitative assessment is performed, an entity is no longer required to calculate the fair value of an indefinite-lived intangible assets unless the entity determines that, based on that assessment, it is more likely than not that its fair value is less than its carrying amount. ADS completed a quantitative fair value measurement of indefinite-lived trademarks in March 31, 2016. The test indicated that the fair value of the indefinite-lived trademarks substantially exceeded the carrying value, indicating that no impairment existed. ADS applied the qualitative assessment to specific trademarks for the annual impairment test performed as of March 31, 2018 and 2017. For the current year test, ADS assessed various assumptions, events and circumstances that would have affected the estimated fair value of the reporting unit as compared to its March 31, 2016 quantitative fair value measurement. The results of this assessment indicated that it is not more likely than not that the trademarks fair value is less than the reporting unit carrying value. The Company did not incur any impairment charges for Intangible assets in the fiscal years ended March 31, 2018, 2017, and 2016.
Other Assets	Other Assets - Other assets include investments in unconsolidated affiliates accounted for under the equity method, cash surrender value of officer life insurance on key senior management executives, capitalized software development costs, deposits, central parts, and other miscellaneous assets. In the year ended March 31, 2018, the Company discontinued offering the cash surrender value of officer life insurance, and collected proceeds of $13.6 million from the sale of the officer life insurance. The Company capitalizes development costs for internal use software. Capitalization of software development costs begins in the application development stage and ends when the asset is placed into service. The Company amortizes such costs using the straight-line method over estimated useful lives of 2 to 10 years, which is included in General and administrative expense, Selling expense or Cost of goods sold within the Consolidated Statements of Operations depending on the nature of the asset and its intended use. Central parts represent spare production equipment items which are used to replace worn or broken production equipment parts and help reduce the risk of prolonged equipment outages. The cost of central parts is amortized on a straight line basis over estimated useful lives of 5 to 10 years. The Company evaluates its investments in unconsolidated affiliates for impairment whenever events or changes in circumstances indicate that the carrying amount might not be recoverable, and recognizes an impairment loss when a decline in value below carrying value is determined to be other-than-temporary. Under these circumstances, the Company would adjust the investment down to its estimated fair value, which then becomes its new carrying value. For the fiscal years ended March 31, 2017, the Company recorded an impairment charge of $1.3 million related to its investment in the South American Joint Venture. The impairment charge is included in Equity in net loss of unconsolidated affiliates in the Consolidated Statements of Operations. Other assets as of the fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 Investments in unconsolidated affiliates $ 12,343 $ 8,986 Cash surrender value of officer life insurance — 12,028 Capitalized software development costs, net 10,195 7,980 Deposits 2,776 1,289 Central parts 2,089 1,856 Other 10,551 14,398 Total other assets $ 37,954 $ 46,537 The following table sets forth amortization expense related to Other assets in each of the fiscal years ended March 31: (Amounts in thousands) 2018 2017 2016 Capitalized software development costs $ 2,156 $ 3,372 $ 3,872 Central parts 47 54 362 Other 1,688 1,689 1,898
Leases	Leases - Leases are reviewed for capital or operating classification at their inception. The Company uses the lower of the rate implicit in the lease or its incremental borrowing rate in the assessment of lease classification and assumes the initial lease term includes cancellable and renewal periods that are reasonably assured. For leases classified as capital leases at lease inception, the Company records a capital lease asset and lease financing obligation equal to the lesser of the present value of the minimum lease payments or the fair market value of the leased asset. The capital lease asset is recorded in Property, plant and equipment, net and amortized to its expected residual value at the end of the lease term using the straight-line method, and the lease financing obligation is amortized using the effective interest method over the lease term with the rental payments being allocated to principal and interest. For leases classified as operating leases, the Company records rent expense over the useful life using the straight-line method.
Foreign Currency Translation	Foreign Currency Translation - Assets and liabilities of foreign subsidiaries with a functional currency other than the U.S. dollar are translated into U.S. dollars at the current rate of exchange on the last day of the reporting period. Revenues and expenses are translated at a monthly average exchange rate and equity transactions are translated using either the actual exchange rate on the day of the transaction or a monthly average historical exchange rate. For the fiscal years ended March 31, 2018, 2017, and 2016, the Company’s Accumulated other comprehensive loss (“AOCL”) consisted of foreign currency translation gains and losses.
Net Sales	Net Sales - The Company sells pipe products and related water management products. ADS ships products to customers predominantly by internal fleet and to a lesser extent by third-party carriers. The Company does not provide any additional revenue generating services after product delivery. Sales, net of sales tax and allowances for returns, rebates and discounts are recognized from product sales when persuasive evidence of an arrangement exists, delivery has occurred, the price to the buyer is fixed or determinable and collectability is reasonably assured. ADS recognizes revenue when both persuasive evidence of an arrangement and the price is fixed or determinable. Title to the products and risk of loss generally passes to the customer upon delivery. ADS performs credit check procedures on all new customers, establishes credit limits accordingly, and monitors the creditworthiness of existing customers, which is the basis for concluding that collectability is reasonably assured.
Shipping Costs	Shipping Costs - The Company incurs shipping costs to deliver products to customers using an in-house fleet or common carrier. Typically shipping costs are prepaid and included in the product price; however, in some instances, the Company bills shipping costs to customers. Shipping costs are also incurred to physically move raw materials, tooling and products between manufacturing and distribution facilities. Shipping costs for the fiscal years ended March 31, 2018, 2017, and 2016 were $133.8 million, $120.4 million, and $120.5 million, respectively, and are included in Cost of goods sold. Shipping costs billed to customers were $6.3 million, $5.5 million, and $7.0 million during 2018, 2017 and 2016, respectively, and are included in Net sales.
Stock-Based Compensation	Stock-Based Compensation - See “Note 16. Stock-Based Compensation” for information about our stock-based compensation award programs and related accounting policies. The Company has several programs for stock-based payments to employees and directors, including stock options and restricted stock. Stock-based compensation expense is recorded in General and administrative expenses, Selling expenses and Cost of goods sold in the Consolidated Statements of Operations. The Company recognized stock-based compensation expense (benefit) in the following line items on the Consolidated Statements of Operations for the fiscal years ended March 31, 2018, 2017, and 2016: (Amounts in thousands) 2018 2017 2016 Component of income before income taxes: Cost of goods sold $ 179 $ 177 $ (300 ) Selling expenses 105 177 (500 ) General and administrative expenses 6,837 7,953 (5,068 ) Total stock-based compensation expense (benefit) $ 7,121 $ 8,307 $ (5,868 ) The following table summarizes stock-based compensation expense (benefit) by award type for the fiscal years ended March 31, 2018, 2017, and 2016: (Amounts in thousands) 2018 2017 2016 Stock-based compensation expense (benefit): Liability-classified stock options $ — $ 4,936 $ (6,784 ) Equity-classified stock options 4,148 108 — Restricted stock 1,741 1,945 916 Non-employee director 1,232 1,318 — Total stock-based compensation expense (benefit) $ 7,121 $ 8,307 $ (5,868 ) On April 1, 2017, the Company modified all outstanding awards to remove the provision that permitted employees to satisfy their personal tax liability with the net settlement of shares in excess of minimum tax withholding. Consistent with the ASU in Note 1, employees can now withhold shares with a fair value up to the maximum statutory rate. Accordingly, the Company modified the awards previously accounted for as liability-classified to equity-classified and reclassified the carrying amount of the awards of $13.7 million to Paid-in capital in the Consolidated Balance Sheet. All stock options have been accounted for as equity-classified awards for the periods subsequent to the modification. Prior to the modification, liability-classified awards were reclassified to additional paid in capital at fair value when stock options were exercised. The following table summarizes the assumptions used in estimating the fair value of stock options: 2018 2017 2016 Common stock price $19.35 - $22.95 $18.70 - $28.17 $18.34 - $33.03 Expected stock price volatility 32.1% - 35.6% 29.6% - 33.0% 31.1% - 39.3% Risk-free interest rate 1.9% - 2.2% 0.9% - 1.9% 0.5% - 1.5% Weighted-average expected option life (years) 5.6 – 6.0 0.5 – 5.1 0.5 – 6.2 Dividend yield 1.1% - 1.5% 0.9% 0.9% 2010 and 2013 Stock Options Plans 2000 Plan - The Company’s 2000 stock option plan (“2000 Plan”) provides for the issuance of statutory and non-statutory 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 approximately 10 years from issuance. The Company had no shares available for grant under the 2000 Plan as of March 31, 2018. The stock option activity for the fiscal year ended March 31, 2018 is summarized as follows: (Share amounts in thousands) Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Outstanding at beginning of year 195 $ 13.31 5.4 Granted — — — Exercised (55 ) 11.73 — Forfeited (5 ) 15.74 — Outstanding at end of year 135 13.85 4.8 Vested at end of year 81 12.61 4.1 Unvested at end of year 54 15.74 6.0 Fair value of options granted during the year $ — All outstanding options are expected to vest. The following table summarizes information about the unvested stock option grants as of the fiscal year ended March 31, 2018: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 59 $ 6.76 Granted — — Vested — — Forfeitures (5 ) 6.76 Unvested at end of year 54 $ 6.76 As of March 31, 2018, there was a total of $0.2 million of unrecognized compensation expense related to unvested stock option awards under the 2000 plan that will be recognized as an expense as the awards vest over the remaining weighted average service period of 3.3 years. No options vested during the fiscal years ended March 31, 2018, 2017 and 2016. No options were granted during the fiscal years ended March 31, 2018, 2017 and 2016. The aggregate intrinsic value for options outstanding and currently exercisable as of March 31, 2018 was $1.6 million and $1.1 million, respectively. The total intrinsic value of options exercised during the fiscal years ended March 31, 2018, 2017, and 2016 were $0.5 million, $3.7 million and $3.7 million, respectively. 2013 Plan - The Company’s 2013 stock option plan (“2013 Plan”) provides for the issuance of non-statutory 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 generally vest in three to five equal annual amounts beginning in year one and expire after approximately 10 years from issuance. Options issued to the former Chief Executive Officer vested equally over four years and expire after approximately 10 years from issuance. The Company had no shares available for grant under the 2013 Plan as of March 31, 2018. The stock option activity for the fiscal year ended March 31, 2018 is summarized as follows: (Share amounts in thousands) Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Outstanding at beginning of year 2,260 $ 16.04 6.7 Granted 3 22.95 — Exercised (618 ) 13.65 — Forfeited (143 ) 24.20 — Outstanding at end of year 1,502 16.27 5.9 Vested at end of year 1,063 15.10 5.4 Unvested at end of year 439 19.09 6.5 Fair value of options granted during the year $ 7.53 All outstanding options are expected to vest. The following table summarizes information about the unvested stock option grants as of the fiscal year ended March 31, 2018: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 1,120 $ 8.51 Granted 3 7.53 Vested (541 ) 8.76 Forfeited (143 ) 7.99 Unvested at end of year 439 $ 8.42 As of March 31, 2018, there was a total of $2.4 million of unrecognized compensation expense related to unvested stock option awards under the 2013 Plan that will be recognized as an expense as the awards vest over the remaining weighted average service period of 1.5 years. The aggregate intrinsic value for options outstanding and currently exercisable as of March 31, 2018 was $14.5 million and $11.4 million, respectively. The total fair value of options that vested during the fiscal years ended March 31, 2018, 2017, and 2016 were $4.7 million, $3.4 million, and $3.6 million, respectively. The total intrinsic value of options exercised during the fiscal year ended March 31, 2018 was $4.4 million. 2008 Restricted Stock Plan On September 16, 2008, the Board of Directors adopted the restricted stock plan, which provides for the issuance of restricted stock awards to certain key employees. The restricted stock generally vest ratably over a five-year period from the original restricted stock grant date, contingent on the employee’s continuous employment by ADS. In certain instances, however, a portion of the grants vested immediately or for accounting purposes were deemed to have vested immediately, including the grants to the former Chief Executive Officer, which do not have a substantial risk of forfeiture as a result of different vesting provisions. Under the restricted stock plan, vested shares 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 non-forfeited shares. The restricted stock is accounted for as equity-classified awards. The fair value of restricted stock is based on the fair value of the Company’s common stock. Compensation expense is recognized on a straight-line basis over the employee’s requisite service period, which is generally the vesting period of the grant. The Company had no shares available for grant under this plan as of March 31, 2018. The information about the unvested restricted stock grants as of March 31, 2018 is as follows: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 254 $ 21.92 Granted 1 22.15 Vested (151 ) 21.25 Forfeited (3 ) 22.49 Unvested at end of year 101 $ 22.95 The Company expects all restricted stock grants to vest. At March 31, 2018, there was approximately $1.9 million of unrecognized compensation expense related to the restricted stock that will be recognized over the weighted average remaining service period of 1.7 years. During the fiscal year ended March 31, 2018 and 2017, the weighted average grant date fair value of restricted stock granted was $22.15 and $24.20, respectively. No restricted stock was granted during the fiscal year ended March 31, 2016. During the fiscal years ended March 31, 2018, 2017, and 2016, the total fair value of restricted stock that vested was $2.9 million, $1.2 million and $1.1 million, respectively. 2017 Omnibus Plan On May 24, 2017, the Board of Directors approved the 2017 Omnibus Incentive Plan (the “2017 Incentive Plan”) which was approved by the Company’s stockholders on July 17, 2017. The 2017 Incentive Plan provides for the issuance of a maximum of 3.5 million shares of the Company’s common stock for awards made thereunder, which awards may consist of stock options, restricted stock, restricted stock units, stock appreciation rights, phantom stock, cash-based awards, performance awards (which may take the form of performance cash, performance units or performance shares) or other stock-based awards. The Company had approximately 3.3 million shares available for awards as of March 31, 2018. The 2017 Incentive Plan replaces the 2000 Incentive Stock Option Plan, 2008 Restricted Stock Plan, 2013 Stock Option Plan, and 2014 Non-Employee Director Compensation Plan (the “Prior Plans”) and no further grants will be made under the prior plans. The stock option activity for the fiscal year ended March 31, 2018 is summarized as follows: (Share amounts in thousands) Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Outstanding at beginning of year — — — Granted 198 $ 19.75 — Exercised — — — Forfeited — — — Outstanding at end of year 198 19.75 9.4 Vested at end of year — — — Unvested at end of year 198 19.75 9.4 Fair value of options granted during the year 5.94 The following table summarizes information about the unvested stock option grants as of the fiscal year ended March 31, 2018: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year — — Granted 198 $ 5.94 Vested — — Forfeited — — Unvested at end of year 198 $ 5.94 The aggregate intrinsic value for options outstanding as of March 31, 2018 was $1.2 million. There were no options that vested or were exercised during the fiscal year ended March 31, 2018. The information about the unvested restricted stock grants as of March 31, 2018 is as follows: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year — $ — Granted 108 19.91 Vested — — Forfeited — — Unvested at end of year 108 $ 19.91 At March 31, 2018, there was approximately $1.2 million of unrecognized compensation expense related to the restricted stock that will be recognized over the weighted average remaining service period of 2.4 years. During the fiscal year ended March 31, 2018, the weighted average grant date fair value of restricted stock granted was $19.91. During the fiscal year ended March 31, 2018, no restricted stock vested. Non-Employee Director Compensation Plan On June 18, 2014, the Company amended its then-existing Stockholders’ Agreement to authorize 0.3 million shares of restricted stock to be granted to non-employee members of its Board of Directors. The shares typically will 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. The Company has determined that the restricted stock granted to directors should be accounted for as equity-classified awards. The Company had no shares available for grant under this plan as of March 31, 2018. The following table summarizes information about the unvested Non-Employee Director Compensation stock grants as of March 31, 2018 : 2018 (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 40 $ 24.20 Granted — — Vested (40 ) — Unvested at end of year — $ — As of March 31, 2018, there was no unrecognized compensation expense.
Advertising	Advertising - The Company expenses advertising costs as incurred. Advertising costs are recorded in Selling expenses in the Consolidated Statements of Operations. The total advertising costs were $4.1 million, $3.1 million, and $3.2 million for the fiscal years ended March 31, 2018, 2017, and 2016, respectively.
Self-Insurance	Self-Insurance - The Company is self-insured for short term disability and medical coverage it provides for substantially all eligible employees. The Company is self-insured for medical claims up to the individual and aggregate stop-loss coverage limits. The Company accrues for claims incurred but not reported based on an estimate of future claims related to events that occurred prior to the fiscal year end if it has not met the aggregate stop-loss coverage limit. Amounts expensed totaled $41.3 million, $39.5 million, and $37.5 million for the fiscal years ended March 31, 2018, 2017, and 2016, respectively, of which employees contributed $5.9 million, $5.1 million, and $4.5 million, respectively. ADS is also self-insured for various other general insurance programs to the extent of the applicable deductible limits on the Company’s insurance coverage. These programs include primarily automobile, general liability and employment practices coverage with a deductible of $0.3 million per occurrence or claim incurred. Amounts expensed during the period, including an estimate for claims incurred but not reported at year end, were $2.2 million, $1.8 million, and $2.1 million, for the years ended March 31, 2018, 2017, and 2016, respectively. ADS is also self-insured for workers’ compensation insurance with stop-loss coverage for claims that exceed $0.5 million per incident up to the respective state statutory limits. Amounts expensed, including an estimate for claims incurred but not reported, were $1.3 million, $2.1 million, and $3.9 million for the fiscal years ended March 31, 2018, 2017, and 2016, respectively.
Income Taxes	Income Taxes - Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized and represent the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. They are measured using the enacted tax rates expected to apply to taxable income in the years in which the related temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The deferred income tax provision represents the change during the reporting period in the deferred tax assets and deferred tax liabilities. Penalties and interest recorded on income taxes payable are recorded as part of Income tax expense. The Company determines whether an uncertain tax position is more likely than not to be sustained upon examination, including resolution of any related appeals or litigation process, based upon the technical merits of the position. For tax positions meeting the more likely than not threshold, the tax amount recognized in the financial statements is the largest amount of tax benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant taxing authority.
Fair Values	Fair Values - The fair value framework requires the categorization of assets and liabilities into three levels based upon assumptions (inputs) used to price the assets or liabilities. Level 1 provides the most reliable measure of fair value, whereas Level 3 generally requires significant management judgment. The three levels are defined as follows: Level 1 — Unadjusted quoted prices in active markets for identical assets and liabilities. Level 2 — Observable inputs other than those included in Level 1. For example, quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in inactive markets. Level 3 — Unobservable inputs reflecting management’s own assumptions about the inputs used in pricing the asset or liability. ADS’s policy for determining when transfers between levels have occurred is to use the actual date of the event or change in circumstances that caused the transfer.
Concentrations of Risk	Concentrations of Risk - The Company has a large, active customer base of approximately twenty thousand customers with two customers, Ferguson Enterprises and Core and Main, each representing more than 10% of annual net sales. Such customers accounted for 25.4%, 23.5%, and 21.1% of fiscal year 2018, 2017 and 2016 net sales, respectively. The Company’s customer base is diversified across the range of end markets that it serves. Financial instruments that potentially subject the Company to a concentration of credit risk consist principally of Receivables. The Company provides its products to customers based on an evaluation of the customers’ financial condition, generally without requiring collateral. Exposure to losses on Receivables is principally dependent on each customer’s financial condition. The Company performs ongoing credit evaluations of its customers. The Company monitors the exposure for credit losses and maintains allowances for anticipated losses. Concentrations of credit risk with respect to Receivables are limited due to the large number of customers comprising the Company’s customer base and their dispersion across many different geographies. One customer, Ferguson Enterprises, accounted for approximately 17.6% and 15.7% of Receivables at March 31, 2018 and 2017, respectively.
Derivatives	Derivatives - The Company recognizes derivative instruments as either assets or liabilities and measure those instruments at fair value. ADS uses interest rate swaps, commodity options in the form of collars and swaps, and foreign currency forward contracts to manage various exposures to interest rate, commodity price, and exchange rate fluctuations. These instruments do not qualify for hedge accounting treatment. For the interest rate swap executed on June 28, 2017, gains and losses resulting from the difference between the spot rate and applicable base rate is recorded in Interest expense. For commodity options in the form of collars and swaps, and foreign currency forward contracts, gains and losses from contract settlements and changes in fair value of the derivative instruments are recognized in Derivative losses (gains) and other expense (income), net in the Consolidated Statements of Operations. The Company’s policy is to present all derivative balances on a gross basis. The Company also has forward purchase agreements in place with certain resin suppliers for virgin polyethylene resin. The agreements specify a fixed amount of virgin resin material to be purchased at a fixed price for a given period of time in quantities the Company will use in the normal course of business, and therefore, qualify as normal purchase contracts. The cost of such resin is recognized in Cost of goods sold in the Consolidated Statements of Operations.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements Measurement of Inventory — In July 2015, the Financial Accounting Standards Board (“FASB”) issued an accounting standards update (“ASU”) which requires entities to measure most inventory at the lower of cost and net realizable value, simplifying current guidance under which an entity must measure inventory at the lower of cost or market. The determination of market value, under current guidance, is considered unnecessarily complex as there are several potential outcomes based on its definition as replacement cost, net realizable value, or net realizable value less an approximate normal profit margin. Whereas net realizable value, under the update, is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. The Company adopted this standard effective April 1, 2017. The new standard did not have a material impact on the Consolidated Financial Statements. Stock-Based Compensation — In March 2016, the FASB issued an ASU which is intended to simplify certain aspects of the accounting for stock-based compensation. The Company adopted the standard on April 1, 2017. The adoption of the ASU did not have a material impact on the historical Consolidated Financial Statements. This update contains changes to the accounting for excess tax benefits, whereby excess tax benefits will be recognized in the income statement rather than in additional paid-in capital on the balance sheet. This update is expected to result in increased volatility to income tax expense in future periods dependent upon the timing of employee exercises of stock options, the price of the Company's common stock and the vesting of restricted stock awards. In addition, excess tax benefits will now be classified as operating cash flows rather than financing cash flows in the Consolidated Statements of Cash Flows. The amendment also contained potential changes to the accounting for forfeitures, whereby entities could elect to either continue to apply the previous requirement to estimate forfeitures when determining compensation expense, or to alternatively reverse the compensation expense of forfeited awards when they occur. The Company will account for forfeitures as they occur, which may result in expense volatility based on the timing of forfeitures. In addition, the update also modified the net-share settlement liability classification exception for statutory income tax withholdings, whereby the new guidance allows an employer with a statutory income tax withholding obligation to withhold shares with a fair value up to the maximum statutory tax rate in the employee’s applicable jurisdiction. The Company included this provision in awards issued in fiscal 2017 and modified previously issued awards on April 1, 2017. See “Note 16. Stock-Based Compensation” for further information on the modification. Recent Accounting Pronouncements Not Yet Adopted Revenue Recognition — In May 2014, the FASB issued an accounting standards update which amends the guidance for revenue recognition. This amendment contains principles 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. In August 2015, the FASB issued an additional accounting standards update that deferred the effective date of the new revenue standard for public entities to periods beginning after December 15, 2017, with early adoption permitted but not earlier than the original effective date of periods beginning after December 15, 2016. There have also been various additional accounting standards updates issued by the FASB in 2016 that further amend this new revenue standard. The updated standard permits the use of either the retrospective or cumulative effect transition method. The Company will adopt this standard effective April 1, 2018 using the modified retrospective method. The adoption of this standard will result in the Company recording a contract asset for estimated inventory returns. At March 31, 2018, the estimated inventory returns would have resulted in a $0.6 million decrease in Receivables, net and a $0.6 million increase in Other current assets on the Company’s Consolidated Balance Sheets. The adoption of this standard will not cause a material shift in the amount or timing of revenue recognition. Leases — In February 2016, the FASB issued an accounting standards update which amends the guidance for leases. This amendment contains principles that will require an entity to recognize most leases on the balance sheet by recording a right-of-use asset and a lease liability, unless the lease is a short-term lease that has an accounting lease term of twelve months or less. The amendment also contains other changes to the current lease guidance that may result in changes to how entities determine which contractual arrangements qualify as a lease, the accounting for executory costs such as property taxes and insurance, as well as which lease origination costs will be capitalizable. The new standard also requires expanded quantitative and qualitative disclosures. This update is effective for fiscal years beginning after December 15, 2018, including interim periods within those years, and early adoption is permitted. The updated standard requires the use of the modified retrospective transition method, whereby the new guidance will be applied at the beginning of the earliest period presented in the financial statements of the period of adoption. The modified retrospective transition approach includes certain practical expedients that entities may elect to apply in transition. The Company expects to adopt this standard effective April 1, 2019. The Company has not yet determined whether to apply any of the available practical expedients. The Company has begun the process of reviewing contracts under the new standard to determine the impact the new standard will have on the consolidated financial statements. The Company implemented a new software solution to improve the process of accounting for leases under the current and new standard. Measurement of Credit Losses — In June 2016, the FASB issued an accounting standards update which provides amended guidance on the measurement of credit losses on financial instruments, including trade receivables. This accounting standards update requires the use of an impairment model referred to as the current expected credit loss model. This update is effective for fiscal years beginning after December 15, 2019, including interim periods within those years, and early adoption is permitted for fiscal years beginning after December 15, 2018. The Company expects to adopt this standard effective April 1, 2020. The Company is currently evaluating the impact of this standard on the consolidated financial statements. Cash Flow Classification — In August 2016, the FASB issued an accounting standards update which provides amended guidance on the classification of certain cash receipts and cash payments in the statement of cash flows, including related to debt prepayment or debt extinguishment costs, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned life insurance and distributions received from equity method investees. This update is effective for fiscal years beginning after December 15, 2017, including interim periods within those years, and early adoption is permitted. This amended guidance must be applied retrospectively to all periods presented, but may be applied prospectively if retrospective application would be impracticable. The Company expects to adopt this standard effective April 1, 2018. The adoption of this standard will not have a material impact on the consolidated financial statements. Definition of a Business – In January 2017, the FASB issued an accounting standards update to clarify the definition of a business. The definition of a business affects many areas of accounting including acquisitions, disposals, goodwill, and consolidation. The amendments are intended to help companies and other organizations evaluate whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments provide a more robust framework to use in determining when a set of assets and activities is a business. The amendments are effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The Company expects to adopt this standard effective April 1, 2018. The adoption of this standard will not have a material impact on the consolidated financial statements. Goodwill Impairment – In January 2017, the FASB issued an accounting standards update which removes the requirement to compare the implied fair value of goodwill with its carrying amount as part of step 2 of the goodwill impairment test. As a result, under the standards update, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The amendments are effect for annual periods beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company expects to adopt this standard effective April 1, 2020. The Company is currently evaluating the impact of this standard on the consolidated financial statements. With the exception of pronouncements described above, there have been no new accounting pronouncements that have significance, or potential significance, to our consolidated financial statements.

Background and Summary of Sig34

Background and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Receivables	Receivables and Allowance for Doubtful Accounts - Receivables include trade receivables, net of an allowance for doubtful accounts, and other miscellaneous receivables. Receivables at March 31, 2018 and 2017 are as follows: (Amounts in thousands) 2018 2017 Trade receivables $ 159,291 $ 160,655 Other miscellaneous receivables 12,670 8,288 Receivables $ 171,961 $ 168,943
Estimated Useful Lives of Related Assets	Depreciation is computed for financial reporting purposes using the straight-line method over the estimated useful lives of the related assets or the lease term, if shorter, as follows: Years Buildings and leasehold improvement 20 — 45 or the lease term if shorter Machinery and equipment 3 — 18
Other Assets	Other assets as of the fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 Investments in unconsolidated affiliates $ 12,343 $ 8,986 Cash surrender value of officer life insurance — 12,028 Capitalized software development costs, net 10,195 7,980 Deposits 2,776 1,289 Central parts 2,089 1,856 Other 10,551 14,398 Total other assets $ 37,954 $ 46,537
Amortization Expense Related to Other Assets	The following table sets forth amortization expense related to Other assets in each of the fiscal years ended March 31: (Amounts in thousands) 2018 2017 2016 Capitalized software development costs $ 2,156 $ 3,372 $ 3,872 Central parts 47 54 362 Other 1,688 1,689 1,898

Loss on Disposal of Assets an35

Loss on Disposal of Assets and Costs from Exit and Disposal Activities (Tables)	12 Months Ended
	Mar. 31, 2018
Discontinued Operations And Disposal Groups [Abstract]
Summary of Loss on Disposal of Assets and Costs from Exit and Disposal Activities	The following table summarizes the activity included in Loss on disposal of assets and costs from exit and disposal activities recorded during the fiscal years ended March 31, 2018, 2017 and 2016: (Amounts in thousands) 2018 2017 2016 Accelerated depreciation $ 3,759 $ — $ — Plant severance 2,041 — — Corporate severance 4,133 — — Product rationalization 1,351 Other restructuring activities 159 — — Total 2018 Restructuring Plan activities $ 11,443 $ — $ — Loss on other disposals and partial disposals of property, plant and equipment 3,560 8,509 812 Total loss on disposal of assets and costs from exit and disposal activities $ 15,003 $ 8,509 $ 812
Schedule of Reconciliation of Restructuring Liability	A reconciliation of the beginning and ending amounts of restructuring liability related to the 2018 Restructuring Plan for the year ended March 31, 2018 is as follows: (Amounts in thousands) 2018 Balance at beginning of year $ — Expenses 11,443 Non-cash expenses (4,882 ) Payments (2,660 ) Balance at end of year $ 3,901

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Mar. 31, 2018
BaySaver [Member]
Summary of Purchase Price Allocation	The purchase price allocation is as follows: (Amounts in thousands) Cash $ 12 Other current assets 2,262 Property, plant and equipment 164 Goodwill 2,495 Intangible assets 10,800 Other assets 152 Current liabilities (1,385 ) Total purchase price $ 14,500
Effect of Acquisitions for Unaudited Pro Forma Consolidated Statements of Operations	The unaudited pro forma consolidated results are not projections of future results of operations of the combined company nor do they reflect the expected realization of any cost savings or synergies associated with the acquisition. Proforma (Amounts in thousands) 2016 Net sales $ 1,294,277 Net income (loss) attributable to ADS 25,090
Schedule of Business Acquisitions by Acquisition, Contingent Consideration	The purchase price was determined as follows: (Amounts in thousands) Acquisition-date fair value of prior equity interest $ 4,220 Acquisition-date fair value of noncontrolling interest 6,330 Cash paid at acquisition date 3,200 Fair value of contingent consideration 750 Total purchase price $ 14,500
Plastic Tubing Industries [Member]
Summary of Purchase Price Allocation	The purchase price allocation is as follows: (Amounts in thousands) Intangible assets $ 160 Inventory 2,050 Property, plant and equipment 7,899 Fair value of net assets acquired 10,109 Purchase price 9,500 Gain on bargain purchase $ 609
Effect of Acquisitions for Unaudited Pro Forma Consolidated Statements of Operations	This unaudited pro forma information is presented for illustrative purposes only and is not indicative of what actual results would have been if the acquisition had taken place on April 1, 2015 or of future results. In addition, the unaudited pro forma consolidated results are not projections of future results of operations of the combined company nor do they reflect the expected realization of any cost savings or synergies associated with the acquisition. Proforma (Amounts in thousands) 2017 2016 Net sales $ 1,266,602 $ 1,302,120 Net income attributable to ADS 33,634 25,100

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Mar. 31, 2018
Property Plant And Equipment [Abstract]
Schedule of Property, Plant and Equipment	Property, plant and equipment, net as of the fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 Land, buildings and improvements $ 200,459 $ 189,163 Machinery and equipment 780,210 771,878 Construction in progress 6,607 14,022 Total cost 987,276 975,063 Less: accumulated depreciation (587,895 ) (568,205 ) Property, plant and equipment, net $ 399,381 $ 406,858
Depreciation Expense Related to Property, Plant and Equipment	The following table sets forth depreciation expense related to Property, plant and equipment in each of the fiscal years ended March 31: (Amounts in thousands) 2018 2017 2016 Depreciation expense (inclusive of leased assets depreciation) (1) $ 63,044 $ 58,692 $ 55,650 (1) Depreciation expense does not include accelerated depreciation expense from the 2018 Restructuring plan. See “Note 2. Loss on Disposal of Assets and Costs from Exit and Disposal Activities” for additional discussion.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Mar. 31, 2018
Leases [Abstract]
Summary of Leased Assets Included in Property, Plant and Equipment	Leased assets included in Property, plant and equipment as of the fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 Buildings and improvements $ 6,124 $ 6,044 Machinery and equipment 208,475 199,813 Total cost 214,599 205,857 Less: accumulated depreciation (110,346 ) (108,144 ) Leased assets in Property, plant and equipment, net $ 104,253 $ 97,713
Schedule of Interest and Depreciation Expense Related to Capital Leases	The following sets forth the interest and depreciation expense related to capital leases recorded in each fiscal year ended March 31: (Amounts in thousands) 2018 2017 2016 Lease interest expense $ 4,086 $ 3,864 $ 3,367 Depreciation of leased assets 18,511 17,415 15,782
Schedule of Future Minimum Lease Payments under Capital Leases and Present Value	The following is a schedule by year of future minimum lease payments under capital leases and the present value of the net minimum lease payments as of March 31, 2018: (Amounts in thousands) 2019 $ 24,809 2020 20,660 2021 16,723 2022 12,887 2023 7,199 Thereafter 7,699 Total minimum lease payments (a) $ 89,977 Less: amount representing interest (b) 8,007 Present value of net minimum lease payments $ 81,970 Current maturities of capital lease obligations 22,007 Long-term capital lease obligations 59,963 Total lease obligation $ 81,970 (a) Excludes contingent rentals which may be paid. Contingent rentals amounted to $0.6 million, $0.6 million and $0.1 million for the years ended March 31, 2018, 2017 and 2016, respectively. (b) Amount necessary to reduce minimum lease payments to present value calculated at the lower of the rate implicit in the lease or the Company’s incremental borrowing rate at lease inception.
Summary of Future Minimum Rental Commitments under Operating Leases	Future minimum rental commitments under non-cancellable operating leases as of March 31, 2018, are summarized below (amounts in thousands): 2019 2020 2021 2022 2023 Thereafter Future operating lease payments $ 3,297 $ 2,371 $ 1,645 $ 1,033 $ 662 $ 2,648

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Mar. 31, 2018
Inventory Disclosure [Abstract]
Schedule of Inventories	Inventories as of the fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 Raw materials $ 54,909 $ 52,746 Finished goods 208,883 205,684 Total Inventories $ 263,792 $ 258,430

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Carrying Amount of Goodwill by Reportable Segment	Goodwill - The carrying amount of goodwill by reportable segment is as follows: (Amounts in thousands) Domestic International Total Balance at April 1, 2016 $ 90,002 $ 10,883 $ 100,885 Currency translation — (319 ) (319 ) Balance at March 31, 2017 $ 90,002 $ 10,564 $ 100,566 Acquisition 2,103 — 2,103 Currency translation — 348 348 Balance at March 31, 2018 $ 92,105 $ 10,912 $ 103,017
Summary of Intangible Assets	Intangible Assets - Intangible assets as of March 31, 2018 and 2017 consisted of the following: 2018 2017 (Amounts in thousands) Gross Intangible Accumulated Amortization Net Intangible Gross Intangible Accumulated Amortization Net Intangible Definite-lived intangible assets Developed technology $ 27,580 $ (17,405 ) $ 10,175 $ 27,580 $ (14,888 ) $ 12,692 Customer relationships 31,035 (20,567 ) 10,468 40,767 (26,768 ) 13,999 Patents 7,512 (4,956 ) 2,556 7,512 (4,768 ) 2,744 Non-compete and other contractual agreements 607 (567 ) 40 1,242 (1,102 ) 140 Trademarks and tradenames 15,969 (6,678 ) 9,291 15,741 (5,465 ) 10,276 Total definite-lived intangible assets 82,703 (50,173 ) 32,530 92,842 (52,991 ) 39,851 Indefinite-lived intangible assets Trademarks 11,907 — 11,907 11,907 — 11,907 Total Intangible assets $ 94,610 $ (50,173 ) $ 44,437 $ 104,749 $ (52,991 ) $ 51,758
Weighted Average Amortization Period for Definite-Lived Intangible assets	The following table presents the weighted average amortization period for definite-lived intangible assets at March 31, 2018: Weighted Average Amortization Period (in years) Developed technology 11.0 Customer relationships 8.6 Patents 8.2 Non-compete and other contractual agreements 5.2 Trademarks and tradenames 13.4
Future Intangible Asset Amortization Expense	The following table presents the future intangible asset amortization expense based on existing intangible assets at March 31, 2018: Fiscal Year (Amounts in thousands) 2019 2020 2021 2022 2023 Thereafter Total Amortization expense $ 7,702 $ 6,017 $ 5,876 $ 4,159 $ 2,520 $ 6,256 $ 32,530

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	12 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Summary of Assets and Liabilities Carried at Fair Value	The assets, liabilities and mezzanine equity carried at fair value as of the fiscal years ended March 31 were as follows: March 31, 2018 (Amounts in thousands) Total Level 1 Level 2 Level 3 Assets: Derivative assets — diesel fuel contracts $ 596 $ — $ 596 $ — Interest rate swaps 2,801 — 2,801 — Total assets at fair value on a recurring basis $ 3,397 $ — $ 3,397 $ — Liabilities: Derivative liability - diesel fuel contracts $ 116 $ — $ 116 $ — Contingent consideration for acquisitions 578 — — 578 Total liabilities at fair value on a recurring basis $ 694 $ — $ 116 $ 578 March 31, 2017 (Amounts in thousands) Total Level 1 Level 2 Level 3 Assets: Derivative assets — diesel fuel contracts $ 179 $ — $ 179 $ — Total assets at fair value on a recurring basis $ 179 $ — $ 179 $ — Liabilities: Derivative liability - diesel fuel contracts $ 142 $ — $ 142 $ — Contingent consideration for acquisitions 1,348 — — 1,348 Total liabilities at fair value on a recurring basis $ 1,490 $ — $ 142 $ 1,348
Summary of Quantitative Information about Level 3 Fair Value Measurements	Quantitative Information about Level 3 Fair Value Measurements (Amounts in thousands) Liabilities & Mezzanine Equity Fair Value at 3/31/18 Valuation Technique(s) Unobservable Input Quantifiable Input Contingent consideration for acquisitions $ 578 Discounted cash flow Weighted Average Cost of Capital (“WACC”) (a) 9.50% Liabilities & Mezzanine Equity Fair Value at 3/31/17 Valuation Technique(s) Unobservable Input Quantifiable Input Contingent consideration for acquisitions $ 1,348 Discounted cash flow Weighted Average Cost of Capital (“WACC”) (a) 9.50% (a) Represents discount rates or rates of return estimates and assumptions that the Company believes would be used by market participants when valuing these liabilities.
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 fiscal years ended March 31, 2018 and 2017 were as follows: Contingent consideration Balance at March 31, 2016 $ 2,858 Change in fair value (266 ) Payments of contingent consideration liability (1,244 ) Balance at March 31, 2017 $ 1,348 Change in fair value 39 Payments of contingent consideration liability (809 ) Balance at March 31, 2018 $ 578

Investment in Affiliates (Table

Investment in Affiliates (Tables)	12 Months Ended
	Mar. 31, 2018
BaySaver [Member]
Assets and Liabilities of Joint Ventures	The table below includes the assets and liabilities of BaySaver that are consolidated as of March 31, 2018 and 2017. The balances exclude intercompany transactions that are eliminated upon consolidation. (Amounts in thousands) 2018 2017 Assets Current assets $ 3,761 $ 2,572 Property, plant and equipment, net 216 111 Other noncurrent assets 10,470 11,568 Total assets $ 14,447 $ 14,251 Liabilities Current liabilities $ 820 $ 1,344 Total liabilities $ 820 $ 1,344
Tigre-ADS USA [Member]
Summarized Financial Data of Joint Ventures	Summarized financial data as of the fiscal years ended March 31 for the Tigre-ADS USA joint venture is as follows: (Amounts in thousands) 2018 2017 Investment in Tigre-ADS USA $ — $ 2,427 Receivable from Tigre-ADS USA 10 9
ADS Mexicana [Member]
Assets and Liabilities of Joint Ventures	The table below includes the assets and liabilities of ADS Mexicana that are consolidated as of March 31, 2018 and 2017. The balances exclude intercompany transactions that are eliminated upon consolidation. (Amounts in thousands) 2018 2017 Assets Current assets $ 24,616 $ 24,952 Property, plant and equipment, net 18,855 19,262 Other noncurrent assets 1,314 2,269 Total assets $ 44,785 $ 46,483 Liabilities Current liabilities $ 8,979 $ 11,042 Noncurrent liabilities 1,343 2,961 Total liabilities $ 10,322 $ 14,003
South American Joint Venture [Member]
Summarized Financial Data of Joint Ventures	Summarized financial data as of the fiscal years ended March 31 for the South American Joint Venture is as follows: (Amounts in thousands) 2018 2017 Investment in South American Joint Venture $ 12,343 $ 6,559 Net Receivable from South American Joint Venture 817 3,639

Debt (Tables)

Debt (Tables)	12 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Long-Term Debt	Long-term debt as of the fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 Secured Bank Loans Revolving Credit Facility — ADS $ 171,500 $ 194,300 Revolving Credit Facility — ADS Mexicana — 1,500 Term Note — 72,500 Senior Notes payable 125,000 75,000 Industrial revenue bonds 940 1,845 Equipment financing 3,336 4,216 ADS Mexicana Scotia Bank revolving credit facility — 1,000 Total 300,776 350,361 Unamortized debt issuance costs (3,028 ) (1,723 ) Current maturities (26,848 ) (37,789 ) Long-term debt obligations $ 270,900 $ 310,849
Maturities of Long-term Debt (Excluding Interest and Deferred Financing Costs)	Maturities of long-term debt (excluding interest and deferred financing costs) as of March 31, 2018 are summarized below: Fiscal Years Ending March 31, (Amounts in thousands) 2019 2020 2021 2022 2023 Thereafter Total Principal maturities $ 26,848 $ 25,936 $ 960 $ 532 $ 171,500 $ 75,000 $ 300,776

Derivative Transactions (Tables

Derivative Transactions (Tables)	12 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Summary of Fair Values for Various Derivatives	A summary of the fair values for the various derivatives at March 31, 2018 and 2017 is presented below: 2018 Assets Liabilities (Amounts in thousands) Receivables Other assets Other accrued liabilities Other liabilities Diesel fuel option collars and swaps $ 573 $ 23 $ (78 ) $ (38 ) Interest rate swaps 311 2,490 — — 2017 Assets Liabilities (Amounts in thousands) Receivables Other assets Other accrued liabilities Other liabilities Diesel fuel option collars and swaps $ 149 $ 30 $ (122 ) $ (20 )
Schedule of Cash Settlements and Net Losses and Net (Gains) on Mark-to-Market Adjustments for Changes in Fair Value of Derivative Contracts	The Company recorded net losses and net (gains) on mark-to-market adjustments for changes in the fair value of derivative contracts as well as net losses and net (gains) on the settlement of derivative contracts as follows: Net Unrealized Mark to Market Losses (Gains) (Amounts in thousands) 2018 2017 2016 Interest rate swaps $ (2,801 ) $ (252 ) $ (513 ) Foreign exchange forward contracts — — 28 Diesel fuel option collars (443 ) (2,642 ) (237 ) Propylene swaps — (8,027 ) 2,885 Total net unrealized mark to market losses (gains) $ (3,244 ) $ (10,921 ) $ 2,163 Net Realized Losses (Gains) (Amounts in thousands) 2018 2017 2016 Foreign exchange forward contracts $ — $ — $ (150 ) Diesel fuel option collars (476 ) 1,893 3,142 Propylene swaps — 6,671 11,742 Total net realized losses (gains) $ (476 ) $ 8,564 $ 14,734

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Mar. 31, 2018
Redeemable Convertible Preferred Stock [Member]
Summarized Cash and Stock Dividends on Allocated Redeemable Convertible Preferred Stock	Cash and stock dividends on allocated Redeemable convertible preferred stock for the fiscal years ended March 31, 2018 and 2017, respectively, are summarized in the following table. (Amounts in thousands) 2018 2017 Quarterly cash dividends $ 1,713 $ 1,494 Annual cash dividends 11 18 Total cash dividends $ 1,724 $ 1,512 Annual stock dividend 134 134 Annual cash dividend 11 18 Total ESOP required dividends $ 145 $ 152 Allocated shares 7,437 7,779 Required dividend per share 0.0195 0.0195 Required dividends $ 145 $ 152

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Mar. 31, 2018
Summary of Stock-based Compensation Expense (Benefit)	The Company recognized stock-based compensation expense (benefit) in the following line items on the Consolidated Statements of Operations for the fiscal years ended March 31, 2018, 2017, and 2016: (Amounts in thousands) 2018 2017 2016 Component of income before income taxes: Cost of goods sold $ 179 $ 177 $ (300 ) Selling expenses 105 177 (500 ) General and administrative expenses 6,837 7,953 (5,068 ) Total stock-based compensation expense (benefit) $ 7,121 $ 8,307 $ (5,868 ) The following table summarizes stock-based compensation expense (benefit) by award type for the fiscal years ended March 31, 2018, 2017, and 2016: (Amounts in thousands) 2018 2017 2016 Stock-based compensation expense (benefit): Liability-classified stock options $ — $ 4,936 $ (6,784 ) Equity-classified stock options 4,148 108 — Restricted stock 1,741 1,945 916 Non-employee director 1,232 1,318 — Total stock-based compensation expense (benefit) $ 7,121 $ 8,307 $ (5,868 )
Summary of Assumption Used in Estimate Fair Value of Stock Options	The following table summarizes the assumptions used in estimating the fair value of stock options: 2018 2017 2016 Common stock price $19.35 - $22.95 $18.70 - $28.17 $18.34 - $33.03 Expected stock price volatility 32.1% - 35.6% 29.6% - 33.0% 31.1% - 39.3% Risk-free interest rate 1.9% - 2.2% 0.9% - 1.9% 0.5% - 1.5% Weighted-average expected option life (years) 5.6 – 6.0 0.5 – 5.1 0.5 – 6.2 Dividend yield 1.1% - 1.5% 0.9% 0.9%
2000 Stock Option Plan [Member]
Schedule of Stock Option Activity	The stock option activity for the fiscal year ended March 31, 2018 is summarized as follows: (Share amounts in thousands) Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Outstanding at beginning of year 195 $ 13.31 5.4 Granted — — — Exercised (55 ) 11.73 — Forfeited (5 ) 15.74 — Outstanding at end of year 135 13.85 4.8 Vested at end of year 81 12.61 4.1 Unvested at end of year 54 15.74 6.0 Fair value of options granted during the year $ —
Schedule of Unvested Stock Option Grants	The following table summarizes information about the unvested stock option grants as of the fiscal year ended March 31, 2018: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 59 $ 6.76 Granted — — Vested — — Forfeitures (5 ) 6.76 Unvested at end of year 54 $ 6.76
2013 Stock Option Plan [Member]
Schedule of Stock Option Activity	The stock option activity for the fiscal year ended March 31, 2018 is summarized as follows: (Share amounts in thousands) Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Outstanding at beginning of year 2,260 $ 16.04 6.7 Granted 3 22.95 — Exercised (618 ) 13.65 — Forfeited (143 ) 24.20 — Outstanding at end of year 1,502 16.27 5.9 Vested at end of year 1,063 15.10 5.4 Unvested at end of year 439 19.09 6.5 Fair value of options granted during the year $ 7.53
Schedule of Unvested Stock Option Grants	The following table summarizes information about the unvested stock option grants as of the fiscal year ended March 31, 2018: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 1,120 $ 8.51 Granted 3 7.53 Vested (541 ) 8.76 Forfeited (143 ) 7.99 Unvested at end of year 439 $ 8.42
2008 Restricted Stock Plan [Member]
Summary of Unvested Restricted Stock Grants	The information about the unvested restricted stock grants as of March 31, 2018 is as follows: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 254 $ 21.92 Granted 1 22.15 Vested (151 ) 21.25 Forfeited (3 ) 22.49 Unvested at end of year 101 $ 22.95
2017 Omnibus Plan [Member]
Schedule of Stock Option Activity	The stock option activity for the fiscal year ended March 31, 2018 is summarized as follows: (Share amounts in thousands) Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Outstanding at beginning of year — — — Granted 198 $ 19.75 — Exercised — — — Forfeited — — — Outstanding at end of year 198 19.75 9.4 Vested at end of year — — — Unvested at end of year 198 19.75 9.4 Fair value of options granted during the year 5.94
Schedule of Unvested Stock Option Grants	The following table summarizes information about the unvested stock option grants as of the fiscal year ended March 31, 2018: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year — — Granted 198 $ 5.94 Vested — — Forfeited — — Unvested at end of year 198 $ 5.94
Summary of Unvested Restricted Stock Grants	The information about the unvested restricted stock grants as of March 31, 2018 is as follows: (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year — $ — Granted 108 19.91 Vested — — Forfeited — — Unvested at end of year 108 $ 19.91
Non Employee Director Compensation Plan [Member]
Schedule of Unvested Stock Option Grants	The following table summarizes information about the unvested Non-Employee Director Compensation stock grants as of March 31, 2018 : 2018 (Share amounts in thousands) Number of Shares Weighted Average Grant Date Fair Value Unvested at beginning of year 40 $ 24.20 Granted — — Vested (40 ) — Unvested at end of year — $ —

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Before Income Taxes of Domestic and Foreign Operations	The components of Income before income taxes for the fiscal years ended March 31 are as follows: (Amounts in thousands) 2018 2017 2016 United States $ 72,109 $ 59,543 $ 45,159 Foreign 4,833 5,288 14,140 Total $ 76,942 $ 64,831 $ 59,299
Schedule of Income Tax Expense	The components of Income tax expense for the fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 2016 Current: Federal $ 17,107 $ 24,318 $ 6,889 State and local 3,541 4,652 2,126 Foreign 2,242 3,040 3,791 Total current tax expense 22,890 32,010 12,806 Deferred: Federal (11,236 ) (5,887 ) 10,019 State and local (55 ) (1,297 ) 1,431 Foreign (188 ) (211 ) (758 ) Total deferred tax expense (benefit) (11,479 ) (7,395 ) 10,692 Total Income tax expense $ 11,411 $ 24,615 $ 23,498
Effective Tax Rate Varied from Statutory Federal Income Tax Rate	For the fiscal years ended March 31, the effective tax rate varied from the statutory Federal income tax rate as a result of the following factors: 2018 2017 2016 Federal statutory rate 31.5 % 35.0 % 35.0 % ESOP stock appreciation 5.4 4.1 5.0 Effect of tax rate of foreign subsidiaries 0.7 1.3 0.8 State and local taxes—net of federal income tax benefit 3.6 4.1 4.3 Stock-based compensation 0.5 0.3 (1.8 ) Uncertain tax position change 0.3 (1.1 ) (3.6 ) Impact of tax reform (19.4 ) — — Return to provision - federal and state (5.0 ) 1.1 — Qualified production activity deduction (2.5 ) (3.3 ) (0.9 ) Closure of Puerto Rico — (4.2 ) — Other (0.3 ) 0.7 0.8 Effective rate 14.8 % 38.0 % 39.6 %
Schedule of Deferred Tax Assets and Liabilities	The tax effect of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at March 31 were comprised of: (Amounts in thousands) 2018 2017 Deferred tax assets: State income taxes $ 1,126 $ 1,474 ESOP loan repayment 891 1,363 Receivable and other allowances 1,696 2,660 Inventory 3,558 5,820 Non-qualified stock options 3,596 6,052 Executive termination payments (Note 15) 1,299 2,044 Worker’s compensation 732 1,323 Foreign net operating losses 445 2,223 Other 2,441 3,359 Total deferred tax assets 15,784 26,318 Less: valuation allowance (26 ) (2,223 ) Total net deferred tax assets 15,758 24,095 Deferred tax liabilities: Intangible assets 4,254 9,728 Property, plant and equipment 38,181 52,322 Goodwill 3,698 3,886 Other 1,814 1,464 Total deferred tax liabilities 47,947 67,400 Net deferred tax liability $ 32,189 $ 43,305 Net deferred tax assets and liabilities are included in Other assets and Deferred tax liabilities, respectively, on the Consolidated Balance Sheets. The related balances at March 31 were as follows: (Amounts in thousands) 2018 2017 Net non-current deferred tax assets $ 115 $ 702 Net non-current deferred tax liabilities 32,304 44,007
Reconciliation of Beginning and Ending Balance of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amounts of unrecognized tax benefits for the years ended March 31, 2018, 2017, and 2016 is as follows: (Amounts in thousands) 2018 2017 2016 Balance at beginning of year $ 6,196 $ 7,998 $ 10,452 Tax positions taken in current year 81 — 917 Decreases in tax positions for prior years — (1,786 ) (599 ) Increases in tax positions for prior years 5,108 80 358 Lapse of statute of limitations (3,940 ) (96 ) (3,130 ) Foreign translation adjustment 148 — — Balance at end of year $ 7,593 $ 6,196 $ 7,998

Net Income Per Share and Stoc48

Net Income Per Share and Stockholders' Equity (Tables)	12 Months Ended
	Mar. 31, 2018
Net Income Per Share And Stockholders Equity [Abstract]
Summary of Net Income Per Share	The following table presents information necessary to calculate net income per share for the fiscal years ended March 31, 2018, 2017, and 2016, 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: (Amounts in thousands, except per share data) 2018 2017 2016 NET INCOME PER SHARE — BASIC: Net income attributable to ADS $ 62,007 $ 32,950 $ 25,052 Adjustment for: Accretion of redeemable noncontrolling interest in subsidiaries — (1,560 ) (932 ) Dividends paid to redeemable convertible preferred stockholders (1,858 ) (1,646 ) (1,425 ) Dividends paid to unvested restricted stockholders (49 ) (73 ) (24 ) Net income available to common stockholders and participating securities 60,100 29,671 22,671 Undistributed income allocated to participating securities (4,514 ) (1,700 ) (1,270 ) Net income available to common stockholders — Basic 55,586 27,971 21,401 Weighted average number of common shares outstanding — Basic 55,696 54,919 53,978 Net income per common share — Basic $ 1.00 $ 0.51 $ 0.40 NET INCOME PER SHARE — DILUTED: Net income available to common stockholders — Diluted 55,586 27,971 21,401 Weighted average number of common shares outstanding — Basic 55,696 54,919 53,978 Assumed exercise of stock options 638 705 1,198 Weighted average number of common shares outstanding — Diluted 56,334 55,624 55,176 Net income per common share — Diluted $ 0.99 $ 0.50 $ 0.39 Potentially dilutive securities excluded as anti- dilutive 6,167 6,228 6,383

Other Accrued Liabilities (Tabl

Other Accrued Liabilities (Tables)	12 Months Ended
	Mar. 31, 2018
Payables And Accruals [Abstract]
Schedule of Other Accrued Liabilities	Other accrued liabilities as of fiscal years ended March 31 consisted of the following: (Amounts in thousands) 2018 2017 Accrued compensation and benefits (1) $ 17,980 $ 17,066 Accrued rebate liability (2) 12,938 8,480 Self-insurance accruals 12,439 8,559 Current portion of liability-classified stock-based awards — 11,926 Other 17,203 20,355 Total accrued liabilities $ 60,560 $ 66,386 (1) Accrued compensation and benefits is primarily comprised of accrued payroll, bonuses and commissions. (2) Accrued rebate liability represents the Company’s estimated rebates to be paid to customers.

Business Segment Information (T

Business Segment Information (Tables)	12 Months Ended
	Mar. 31, 2018
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 in each of the fiscal years ended March 31: (Amounts in thousands) 2018 2017 2016 Domestic Pipe $ 835,421 $ 786,546 $ 812,071 Allied Products 339,011 315,690 301,725 Total domestic 1,174,432 1,102,236 1,113,796 International Pipe 118,644 122,384 139,731 Allied Products 37,278 32,641 37,151 Total international 155,922 155,025 176,882 Total net sales $ 1,330,354 $ 1,257,261 $ 1,290,678
Schedule of Additional Financial Information Attributable to Reportable Segments	The following sets forth certain additional financial information attributable to the reportable segments for the fiscal years ended March 31 . (Amounts in thousands) 2018 2017 2016 Segment Adjusted EBITDA Domestic $ 191,629 $ 175,676 $ 162,875 International 18,601 17,695 24,465 Total $ 210,230 $ 193,371 $ 187,340 Interest expense Domestic $ 14,929 $ 17,049 $ 17,908 International 333 418 552 Total $ 15,262 $ 17,467 $ 18,460 Income tax expense Domestic $ 9,199 $ 21,786 $ 20,465 International 2,212 2,829 3,033 Total $ 11,411 $ 24,615 $ 23,498 Depreciation and amortization Domestic $ 66,978 $ 63,747 $ 62,625 International 8,025 8,608 8,384 Total $ 75,003 $ 72,355 $ 71,009 Equity in net (loss) income of unconsolidated affiliates Domestic $ (2,427 ) $ (505 ) $ 181 International 1,688 (3,803 ) (5,415 ) Total $ (739 ) $ (4,308 ) $ (5,234 ) Capital expenditures Domestic $ 39,562 $ 39,642 $ 37,242 International 2,147 7,034 7,700 Total $ 41,709 $ 46,676 $ 44,942 The following sets forth certain additional financial information attributable to the reportable segments as of March 31: (Amounts in thousands) 2018 2017 Investments in unconsolidated affiliates Domestic $ — $ 2,427 International 12,343 6,559 Total $ 12,343 $ 8,986 Total identifiable assets Domestic $ 904,718 $ 917,006 International 142,822 134,987 Eliminations (4,298 ) (5,708 ) Total $ 1,043,242 $ 1,046,285
Schedule of Reconciliation of Segment Adjusted EBITDA to Net Income	Reconciliation of Segment Adjusted EBITDA to Net income 2018 2017 2016 (Amounts in thousands) Domestic International Domestic International Domestic International Net income (loss) $ 57,279 $ 7,513 $ 35,118 $ 790 $ 24,875 $ 5,692 Depreciation and amortization 66,978 8,025 63,747 8,608 62,625 8,384 Interest expense 14,929 333 17,049 418 17,908 552 Income tax expense 9,199 2,212 21,786 2,829 20,465 3,033 Derivative fair value adjustments (443 ) — (10,921 ) — 2,139 24 Foreign currency transaction (gains) losses — (1,748 ) — (1,629 ) — 697 Loss (gain) on disposal of assets and costs from exit and disposal activities 14,248 755 4,793 3,716 892 (80 ) Unconsolidated affiliates interest, taxes, depreciation and amortization (a) 1,181 1,511 1,088 1,663 1,052 2,163 Contingent consideration remeasurement 39 — (265 ) — 371 — Stock-based compensation expense (benefit) 7,121 — 8,307 — (5,868 ) — ESOP deferred stock-based compensation 11,724 — 9,568 — 10,250 — Executive retirement expense (benefit) 1,473 — 1,092 — (294 ) — Loss related to BaySaver step acquisition — — — — 490 — Inventory step up related to PTI acquisition — — 525 — — — Bargain purchase gain on PTI acquisition — — (609 ) — — — Restatement-related costs (b) 4,227 — 24,026 — 27,970 — Legal settlement (c) 2,000 — — — — — Impairment on investment in unconsolidated affiliate (d) 312 — — 1,300 — 4,000 Transaction costs (e) 1,362 — 372 — — — Segment Adjusted EBITDA (f) $ 191,629 $ 18,601 $ 175,676 $ 17,695 $ 162,875 $ 24,465 (a) Includes the Company’s proportional share of interest, income taxes, depreciation and amortization related to its South American Joint Venture and its Tigre-ADS USA Joint Venture, which are accounted for under the equity method of accounting. In addition, these amounts include the Company’s proportional share of interest, income taxes, depreciation and amortization related to its BaySaver Joint Venture prior to the step acquisition of BaySaver on July 17, 2015, which was previously accounted for under the equity method of accounting. (b) Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with the restatement of the prior period financial statements as reflected in the fiscal year 2015 Form 10-K and fiscal year 2016 Form 10-K/A. (c) Represents settlement agreement to resolve the Hayes matter, as further discussed in “Note 14. Commitments and Contingencies” to the Consolidated Financial Statements. (d) Represents an other-than-temporary impairment of our investments in Tigre-ADS USA and the South American Joint Venture. (e) Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with the debt refinancing and asset acquisitions and dispositions. (f) A portion of the reduction in International Adjusted EBITDA from fiscal 2016 to fiscal 2017 is related to transfer pricing. The reduction is fully offset by an increase in Domestic Adjusted EBITDA.
Net Sales and Long-Lived Asset by Geographic Location	Geographic Sales and Assets Information Net sales are attributed to the geographic location based on the location of the customer. The table below represents the Net sales and long-lived asset information by geographic location for each of the fiscal years ended March 31: (Amounts in thousands) 2018 2017 2016 Net Sales North America $ 1,313,917 $ 1,243,074 $ 1,274,700 Other 16,437 14,187 15,978 Total $ 1,330,354 $ 1,257,261 $ 1,290,678 (Amounts in thousands) 2018 2017 Long-Lived Assets (a) North America $ 401,470 $ 411,752 Other 12,343 6,559 Total $ 413,813 $ 418,311 (a) For segment reporting purposes, long-lived assets include Investments in unconsolidated affiliates, Central parts and Property, plant and equipment.

Supplemental Disclosures of C51

Supplemental Disclosures of Cash Flow Information (Tables)	12 Months Ended
	Mar. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosures Cash Flow Information	Supplemental disclosures of cash flow information for the fiscal years ended March 31 were as follows: (Amounts in thousands) 2018 2017 2016 Supplemental disclosures of cash flow information — cash paid during years: Interest $ 17,890 $ 17,273 $ 18,352 Income taxes 24,510 13,525 32,175 (Amounts in thousands) 2018 2017 2016 Supplemental disclosures of noncash investing and financing activities: Redeemable convertible preferred stock dividend $ 134 $ 134 $ 132 Purchases of plant, property, and equipment included in accounts payable 1,258 2,549 1,165 Receivable recorded for sale of businesses — — 150 ESOP distributions in common stock 11,566 7,425 10,250 Assets acquired and obligation incurred under capital lease 26,571 26,276 34,207 Lease obligation retired upon disposition of leased assets 636 390 134 Reclassification of liability-classified stock options and restricted stock to equity — 4,147 3,702 Contribution of net accounts receivable to the South American Joint Venture 2,785 — — Payable recorded for business acquisition 300 950 —

Quarterly Financial Informati52

Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Mar. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Summary of Quarterly Financial Information	The following tables set forth certain historical unaudited consolidated condensed quarterly financial information for each of the quarters during the years ended March 31, 2018 and 2017. Fiscal Year 2018 For the Three Months Ended (in thousands, except per share amounts) March 31, 2018 December 31, 2017 September 30, 2017 June 30, 2017 Net sales $ 250,114 $ 320,832 $ 401,049 $ 358,359 Gross profit 48,115 77,826 89,801 86,739 Net (loss) income (4,856 ) 33,215 17,959 18,474 Net (loss) income attributable to ADS (5,703 ) 32,105 17,863 17,742 Net (loss) income per share Basic (1) $ (0.11 ) $ 0.52 $ 0.29 $ 0.29 Diluted (1) $ (0.11 ) $ 0.51 $ 0.29 $ 0.28 Fiscal Year 2017 For the Three Months Ended (in thousands, except per share amounts) March 31, 2017 December 31, 2016 September 30, 2016 June 30, 2016 Net sales $ 244,184 $ 294,716 $ 360,785 $ 357,576 Gross profit 39,251 69,441 90,512 96,606 Net (loss) income (18,052 ) 10,258 24,281 19,421 Net (loss) income attributable to ADS (18,110 ) 9,053 23,734 18,273 Net (loss) income per share Basic (1) $ (0.34 ) $ 0.14 $ 0.38 $ 0.29 Diluted (1) $ (0.34 ) $ 0.14 $ 0.38 $ 0.29 (1) The earnings per share calculations for each quarter are based upon the applicable weighted average shares outstanding for each period and may not necessarily be equal to the full year share amount.

Background and Summary of Sig53

Background and Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2017USD ($)	Mar. 31, 2016USD ($)	Mar. 31, 2018USD ($)SegmentCustomer	Mar. 31, 2017USD ($)	Mar. 31, 2016USD ($)
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Number of reportable segments | Segment			2
Interest capitalized			$ 600,000	$ 600,000	$ 400,000
Impairment charges for goodwill			0	0	0
Impairment charges for intangible assets			0	0	0
Proceeds from sale of officer life insurance			13,644,000
Shipping costs			133,800,000	120,400,000	120,500,000
Advertising costs			4,100,000	3,100,000	3,200,000
Life, accidental death and dismemberment and medical coverage	$ 39,500,000	$ 37,500,000	41,300,000	39,500,000	37,500,000
Self insurance plan employees contribution			5,900,000	5,100,000	$ 4,500,000
Total claims expense, self insurance		3,900,000	$ 1,300,000	2,100,000
Minimum likelihood percentage of tax benefit to be realized upon settlement			50.00%
Receivables	168,943,000		$ 171,961,000	168,943,000
Increase in other current assets	6,743,000		5,113,000	$ 6,743,000
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Receivables			600,000
Increase in other current assets			$ 600,000
Sales Revenue, Net [Member] | Ferguson Enterprises and HD Supply Waterworks [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Number of customers in the customer base | Customer			20,000
Concentration risk description			The Company has a large, active customer base of approximately twenty thousand customers with two customers, Ferguson Enterprises and Core and Main, each representing more than 10% of annual net sales.
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Ferguson Enterprises and HD Supply Waterworks [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage			25.40%	23.50%	21.10%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Ferguson Enterprises [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Concentration risk percentage			17.60%	15.70%
Other General Insurance Programs [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Claims per occurrence			$ 300,000
Total claims expense, self insurance			2,200,000	$ 1,800,000	$ 2,100,000
Sales [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Shipping costs			$ 6,300,000	5,500,000	$ 7,000,000
South American Joint Venture [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Other assets, impairment charges	1,300,000	$ 4,000,000		1,300,000
Minimum [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Capitalized software development costs estimated useful lives			2 years
Central parts estimated useful lives			5 years
Claims per incident			$ 500,000
Maximum [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Capitalized software development costs estimated useful lives			10 years
Central parts estimated useful lives			10 years
Other Miscellaneous Receivables [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Receivables	8,288,000		$ 12,670,000	8,288,000
Other Miscellaneous Receivables [Member] | Other Accrued Liabilities [Member]
Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]
Insurance recoverable	$ 2,400,000		$ 3,400,000	$ 2,400,000

Background and Summary of Sig54

Background and Summary of Significant Accounting Policies - Summary of Receivables (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	$ 171,961	$ 168,943
Trade Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	159,291	160,655
Other Miscellaneous Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables	$ 12,670	$ 8,288

Background and Summary of Sig55

Background and Summary of Significant Accounting Policies - Estimated Useful Lives of Related Assets (Detail)	12 Months Ended
	Mar. 31, 2018
Buildings and Leasehold Improvement [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 — 45 or the lease term if shorter
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	18 years

Background and Summary of Sig56

Background and Summary of Significant Accounting Policies - Other assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Other Assets Noncurrent [Abstract]
Investments in unconsolidated affiliates	$ 12,343	$ 8,986
Cash surrender value of officer life insurance		12,028
Capitalized software development costs, net	10,195	7,980
Deposits	2,776	1,289
Central parts	2,089	1,856
Other	10,551	14,398
Total other assets	$ 37,954	$ 46,537

Background and Summary of Sig57

Background and Summary of Significant Accounting Policies - Amortization Expense Related to Other Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Adjustment For Amortization [Abstract]
Capitalized software development costs	$ 2,156	$ 3,372	$ 3,872
Central parts	47	54	362
Other	$ 1,688	$ 1,689	$ 1,898

Loss on Disposal of Assets an58

Loss on Disposal of Assets and Costs from Exit and Disposal Activities - Additional Information (Detail) $ in Thousands	12 Months Ended
	Mar. 31, 2018USD ($)Facility	Mar. 31, 2017USD ($)Facility	Mar. 31, 2016USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal of assets and costs from exit and disposal activities	$ 15,003	$ 8,509	$ 812
Number of manufacturing facilities closed | Facility	4	3
Expenses related to closing of manufacturing facilities		$ 3,500
Accelerated depreciation on identified obsolete assets	$ 3,759
Amount of disposals and partial disposals of fixed assets		2,000
Restructuring plan activities	11,443
Net loss on disposition of the equipment	3,560	8,509	812
Other Accrued Liabilities and Other Liabilities [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Long-term severance liability related to restructuring activities	500
2018 Restructuring Plan [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring plan activities	11,443
Domestic [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal of assets and costs from exit and disposal activities	14,248	4,793	892
Domestic [Member] | 2018 Restructuring Plan [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring plan activities	11,000
International Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal of assets and costs from exit and disposal activities	755	3,716	$ (80)
International Segment [Member] | 2018 Restructuring Plan [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring plan activities	$ 400
Obsolete Assets [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accelerated depreciation on identified obsolete assets		$ 3,000

Loss on Disposal of Assets an59

Loss on Disposal of Assets and Costs from Exit and Disposal Activities - Summary of Loss on Disposal of Assets and Costs from Exit and Disposal Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Discontinued Operations And Disposal Groups [Abstract]
Accelerated depreciation	$ 3,759
Plant severance	2,041
Corporate severance	4,133
Product rationalization	1,351
Other restructuring activities	159
Total 2018 Restructuring Plan activities	11,443
Loss on other disposals and partial disposals of property, plant and equipment	3,560	$ 8,509	$ 812
Total loss on disposal of assets and costs from exit and disposal activities	$ 15,003	$ 8,509	$ 812

Loss on Disposal of Assets an60

Loss on Disposal of Assets and Costs from Exit and Disposal Activities - Schedule of Reconciliation of Restructuring Liability (Detail) $ in Thousands	12 Months Ended
	Mar. 31, 2018USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expenses	$ 11,443
2018 Restructuring Plan [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Expenses	11,443
Non-cash expenses	(4,882)
Payments	(2,660)
Balance at end of year	$ 3,901

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($)	Aug. 01, 2017	Feb. 06, 2017	Jul. 17, 2015	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Business Acquisition [Line Items]
Goodwill				$ 103,017,000	$ 100,566,000	$ 100,885,000
Intangible assets				82,703,000	92,842,000
BaySaver [Member]
Business Acquisition [Line Items]
Acquisition of business			$ 3,200,000
Goodwill			2,495,000
Purchase price			$ 14,500,000
Additionally acquired percentage of ownership in joint ventures			10.00%
Percentage of voting interests acquired			65.00%
Fair value of contingent consideration			$ 750,000
Business combination equity interest remeasurement loss			500,000
Net sales of acquired entity included in condensed consolidated statements of operations						10,200,000
Earnings from operations of acquired entity included in condensed consolidated statements of operations						1,200,000
BaySaver [Member] | Pro Forma [Member]
Business Acquisition [Line Items]
Intangible asset amortization expense, net of related income taxes						100,000
Equity method investments net of related income taxes						100,000
Maximum [Member] | BaySaver [Member] | Pro Forma [Member]
Business Acquisition [Line Items]
Interest expense, net of related income taxes						$ 100,000
Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets				31,035,000	40,767,000
Customer Relationships [Member] | BaySaver [Member]
Business Acquisition [Line Items]
Intangible assets			$ 5,400,000
Intangible assets, useful life			10 years
Developed Technology [Member]
Business Acquisition [Line Items]
Intangible assets				27,580,000	27,580,000
Developed Technology [Member] | BaySaver [Member]
Business Acquisition [Line Items]
Intangible assets			$ 4,000,000
Intangible assets, useful life			10 years
Trademarks and Tradenames [Member]
Business Acquisition [Line Items]
Intangible assets				$ 15,969,000	15,741,000
Trademarks and Tradenames [Member] | BaySaver [Member]
Business Acquisition [Line Items]
Intangible assets			$ 1,400,000
Intangible assets, useful life			10 years
Duraslot, Inc [Member]
Business Acquisition [Line Items]
Date of acquisition of business				Aug. 1, 2017
Acquisition of business	$ 2,300,000
Goodwill	$ 2,100,000
Plastic Tubing Industries [Member]
Business Acquisition [Line Items]
Acquisition of business		$ 8,500,000
Purchase price		9,500,000
Consideration payable		1,000,000
Depreciation and amortization					600,000
Plastic Tubing Industries [Member] | Maximum [Member]
Business Acquisition [Line Items]
Intangible asset amortization expense, net of related income taxes					$ 100,000
Plastic Tubing Industries [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets		$ 200,000
Intangible assets, useful life		7 years

Acquisitions - Summary of Purch

Acquisitions - Summary of Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Feb. 06, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2016	Jul. 17, 2015
Business Acquisition [Line Items]
Goodwill		$ 100,566	$ 103,017	$ 100,885
Gain on bargain purchase		$ 609
BaySaver [Member]
Business Acquisition [Line Items]
Intangible assets					$ 10,800
Cash					12
Other current assets					2,262
Property, plant and equipment					164
Goodwill					2,495
Other assets					152
Current liabilities					(1,385)
Total purchase price					$ 14,500
Plastic Tubing Industries [Member]
Business Acquisition [Line Items]
Intangible assets	$ 160
Inventory	2,050
Property, plant and equipment	7,899
Fair value of net assets acquired	10,109
Total purchase price	9,500
Gain on bargain purchase	$ 609

Acquisitions - Effect of Acquis

Acquisitions - Effect of Acquisitions for Unaudited Pro Forma Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
BaySaver [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net sales		$ 1,294,277
Net income (loss) attributable to ADS		25,090
Plastic Tubing Industries [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net sales	$ 1,266,602	1,302,120
Net income (loss) attributable to ADS	$ 33,634	$ 25,100

Acquisition - Schedule of Busin

Acquisition - Schedule of Business Acquisitions by Acquisition, Contingent Consideration (Detail) - BaySaver [Member] $ in Thousands	Jul. 17, 2015USD ($)
Business Acquisition [Line Items]
Acquisition-date fair value of prior equity interest	$ 4,220
Acquisition-date fair value of noncontrolling interest	6,330
Cash paid at acquisition date	3,200
Fair value of contingent consideration	750
Total purchase price	$ 14,500

Property, Plant, and Equipment

Property, Plant, and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Property, Plant and Equipment [Line Items]
Construction in progress	$ 6,607	$ 14,022
Property, plant and equipment, gross	987,276	975,063
Less: accumulated depreciation	(587,895)	(568,205)
Property, plant and equipment, net	399,381	406,858
Land, Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	200,459	189,163
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 780,210	$ 771,878

Property, Plant, and Equipmen66

Property, Plant, and Equipment - Depreciation Expense Related to Property, Plant and Equipment (Detail) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Property Plant And Equipment [Abstract]
Depreciation expense (inclusive of leased assets depreciation)	[1]	$ 63,044	$ 58,692	$ 55,650
[1]	Depreciation expense does not include accelerated depreciation expense from the 2018 Restructuring plan. See “Note 2. Loss on Disposal of Assets and Costs from Exit and Disposal Activities” for additional discussion.

Leases - Summary of Leased Asse

Leases - Summary of Leased Assets Included in Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Capital Leased Assets [Line Items]
Total cost	$ 214,599	$ 205,857
Less: accumulated depreciation	(110,346)	(108,144)
Leased assets in Property, plant and equipment, net	104,253	97,713
Buildings and Improvements [Member]
Capital Leased Assets [Line Items]
Total cost	6,124	6,044
Machinery and Equipment [Member]
Capital Leased Assets [Line Items]
Total cost	$ 208,475	$ 199,813

Leases - Schedule of Interest a

Leases - Schedule of Interest and Depreciation Expense Related to Capital Leases (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Leases [Abstract]
Lease interest expense	$ 4,086	$ 3,864	$ 3,367
Depreciation of leased assets	$ 18,511	$ 17,415	$ 15,782

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Lease Payments under Capital Leases and Present Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments [Abstract]
2,019	$ 24,809
2,020	20,660
2,021	16,723
2,022	12,887
2,023	7,199
Thereafter	7,699
Total minimum lease payments	89,977
Less: amount representing interest	8,007
Present value of net minimum lease payments	81,970
Current maturities of capital lease obligations	22,007	$ 21,450
Long-term capital lease obligations	59,963	$ 58,710
Total lease obligation	$ 81,970

Leases - Schedule of Future M70

Leases - Schedule of Future Minimum Lease Payments under Capital Leases and Present Value (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments [Abstract]
Contingent rentals amount	$ 0.6	$ 0.6	$ 0.1

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Rental Commitments under Operating Leases (Detail) $ in Thousands	Mar. 31, 2018USD ($)
Leases Operating [Abstract]
Future operating lease payments, 2019	$ 3,297
Future operating lease payments, 2020	2,371
Future operating lease payments, 2021	1,645
Future operating lease payments, 2022	1,033
Future operating lease payments, 2023	662
Future operating lease payments, thereafter	$ 2,648

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Leases [Abstract]
Total rent expense	$ 6.6	$ 6.6	$ 6.3

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 54,909	$ 52,746
Finished goods	208,883	205,684
Total Inventories	$ 263,792	$ 258,430

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($)	Mar. 31, 2018	Mar. 31, 2017
Inventory Disclosure [Abstract]
Work-in-process inventories	$ 0	$ 0
General and administrative cost in inventory	27,000,000	21,200,000
General and administrative cost remained in inventory	$ 6,500,000	$ 6,300,000

Goodwill and Intangible Asset75

Goodwill and Intangible Assets - Carrying Amount of Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Goodwill [Line Items]
Beginning balance	$ 100,566	$ 100,885
Acquisition	2,103
Currency translation	348	(319)
Ending balance	103,017	100,566
Domestic [Member]
Goodwill [Line Items]
Beginning balance	90,002	90,002
Acquisition	2,103
Ending balance	92,105	90,002
International [Member]
Goodwill [Line Items]
Beginning balance	10,564	10,883
Currency translation	348	(319)
Ending balance	$ 10,912	$ 10,564

Goodwill and Intangible Asset76

Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Intangible	$ 82,703	$ 92,842
Accumulated Amortization	(50,173)	(52,991)
Net Intangible	32,530	39,851
Intangible Assets, Gross	94,610	104,749
Intangible assets, net	44,437	51,758
Trademarks [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	11,907	11,907
Developed Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Intangible	27,580	27,580
Accumulated Amortization	(17,405)	(14,888)
Net Intangible	10,175	12,692
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Intangible	31,035	40,767
Accumulated Amortization	(20,567)	(26,768)
Net Intangible	10,468	13,999
Patents [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Intangible	7,512	7,512
Accumulated Amortization	(4,956)	(4,768)
Net Intangible	2,556	2,744
Non-compete and Other Contractual Agreements [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Intangible	607	1,242
Accumulated Amortization	(567)	(1,102)
Net Intangible	40	140
Trademarks and Tradenames [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross Intangible	15,969	15,741
Accumulated Amortization	(6,678)	(5,465)
Net Intangible	$ 9,291	$ 10,276

Goodwill and Intangible Asset77

Goodwill and Intangible Assets - Weighted Average Amortization Period for Definite-Lived Intangible Assets (Detail)	12 Months Ended
	Mar. 31, 2018
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period	11 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period	8 years 7 months 6 days
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period	8 years 2 months 12 days
Non-compete and Other Contractual Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period	5 years 2 months 12 days
Trademarks and Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period	13 years 4 months 24 days

Goodwill and Intangible Asset78

Goodwill and Intangible Assets - Future Intangible Asset Amortization Expense (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense, 2019	$ 7,702
Amortization expense, 2020	6,017
Amortization expense, 2021	5,876
Amortization expense, 2022	4,159
Amortization expense, 2023	2,520
Amortization expense, Thereafter	6,256
Net Intangible	$ 32,530	$ 39,851

Fair Value Measurement - Summar

Fair Value Measurement - Summary of Assets and Liabilities Carried at Fair Value (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value on a recurring basis	$ 3,397	$ 179
Contingent consideration for acquisitions	578	1,348
Total liabilities at fair value on a recurring basis	694	1,490
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value on a recurring basis	3,397	179
Total liabilities at fair value on a recurring basis	116	142
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration for acquisitions	578	1,348
Total liabilities at fair value on a recurring basis	578	1,348
Diesel Fuel Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	596	179
Derivative liability	116	142
Diesel Fuel Contracts [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	596	179
Derivative liability	116	$ 142
Interest Rate Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,801
Interest Rate Swaps [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 2,801

Fair Value Measurement - Summ80

Fair Value Measurement - Summary of Quantitative Information about Level 3 Fair Value Measurements (Detail) - Contingent Consideration for Acquisitions [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Liabilities & Mezzanine Equity	$ 578	$ 1,348
Discounted Cash Flow [Member]
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Valuation Technique(s)	Discounted cash flow
Unobservable Input	Unobservable Input Weighted Average Cost of Capital (?WACC?)(a)
Quantifiable Input	9.50%	9.50%

Fair Value Measurement - Summ81

Fair Value Measurement - Summary of Changes in Fair Value of Recurring Fair Value Measurements Using Unobservable Inputs (Detail) - Level 3 [Member] - Contingent Consideration [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance beginning	$ 1,348	$ 2,858
Change in fair value	39	(266)
Payments of contingent consideration liability	(809)	(1,244)
Balance ending	$ 578	$ 1,348

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets and liabilities, additional transfers	$ 0	$ 0
Level 3 [Member] | South American Joint Venture [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount the future cash flow rates	9.30%
Level 3 [Member] | South American Joint Venture [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount the future cash flow rates	16.50%
Senior Notes Payable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes	$ 125,000,000	75,000,000
Senior notes, fair value	$ 122,300,000	$ 75,900,000

Investment in Consolidated Affi

Investment in Consolidated Affiliates - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2018JointVenture
Investments in and Advances to Affiliates [Line Items]
Number of unconsolidated joint venture participated	2
BaySaver [Member]
Investments in and Advances to Affiliates [Line Items]
Company's ownership percentage	65.00%
Subsidiaries [Member]
Investments in and Advances to Affiliates [Line Items]
Number of unconsolidated joint venture participated	2
Subsidiaries [Member] | ADS Worldwide, Inc [Member]
Investments in and Advances to Affiliates [Line Items]
Company's ownership percentage	51.00%
Subsidiaries [Member] | ADS Mexicana [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Investments in and Advances to Affiliates [Line Items]
Company's ownership percentage	51.00%

Investment in Consolidated Af84

Investment in Consolidated Affiliates - Assets and Liabilities of Joint Ventures (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Assets
Current assets	$ 458,453	$ 440,566
Property, plant and equipment, net	399,381	406,858
Other noncurrent assets	37,954	46,537
Total assets	1,043,242	1,046,285
Liabilities
Current liabilities	221,243	255,754
Total liabilities	609,433	695,850
BaySaver [Member]
Assets
Current assets	3,761	2,572
Property, plant and equipment, net	216	111
Other noncurrent assets	10,470	11,568
Total assets	14,447	14,251
Liabilities
Current liabilities	820	1,344
Total liabilities	820	1,344
ADS Mexicana [Member]
Assets
Current assets	24,616	24,952
Property, plant and equipment, net	18,855	19,262
Other noncurrent assets	1,314	2,269
Total assets	44,785	46,483
Liabilities
Current liabilities	8,979	11,042
Noncurrent liabilities	1,343	2,961
Total liabilities	$ 10,322	$ 14,003

Investment in Unconsolidated Af

Investment in Unconsolidated Affiliates - Additional Information (Detail) $ in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Apr. 30, 2018USD ($)	Dec. 31, 2017USD ($)	Mar. 31, 2017USD ($)	Mar. 31, 2016USD ($)	Mar. 31, 2018USD ($)JointVenture	Mar. 31, 2017USD ($)	Mar. 31, 2016USD ($)
Investments in and Advances to Affiliates [Line Items]
Number of unconsolidated joint venture participated | JointVenture					2
South American Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items]
Percentage of ownership in joint ventures					50.00%
Percentage of ownership in joint venture partner			50.00%			50.00%
Receivables contributed		$ 5.8
Allowance for doubtful accounts		3			$ 3
Fair value of additional investment in joint venture		4.7
Gain on book value of receivables		$ 1.9
Other assets, impairment charges			$ 1.3	$ 4		$ 1.3
Difference between cost of investment and amount of underlying equity in net assets			$ 4.9		$ 4.4	4.9
Estimated remaining useful life of underlying property, plant and equipment					8 years
Amortization recognized					$ 0.5	$ 0.4	$ 0.1
Tigre-ADS USA [Member]
Investments in and Advances to Affiliates [Line Items]
Percentage of ownership in joint ventures					49.00%
Other assets, impairment charges	$ 0.3

Investment in Unconsolidated 86

Investment in Unconsolidated Affiliates - Summarized Financial Data of Joint Ventures (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Investments in and Advances to Affiliates [Line Items]
Investment in unconsolidated affiliates	$ 12,343	$ 8,986
South American Joint Venture [Member]
Investments in and Advances to Affiliates [Line Items]
Investment in unconsolidated affiliates	12,343	6,559
Receivable from unconsolidated joint venture	817	3,639
Tigre-ADS USA [Member]
Investments in and Advances to Affiliates [Line Items]
Investment in unconsolidated affiliates		2,427
Receivable from unconsolidated joint venture	$ 10	$ 9

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Jun. 30, 2015	Apr. 30, 2015
South American Joint Venture [Member]
Related Party Transaction [Line Items]
Percentage of debt guarantee	50.00%
Maximum potential payment under guarantee	$ 11,000,000
Maximum borrowings permitted under credit facility	$ 22,000,000
Debt, expiration date	Dec. 31, 2020
Outstanding letters of credit	$ 14,500,000	$ 16,000,000
Sales with related parties	2,100,000	1,300,000
Sale with joint ventures	$ 400,000	$ 900,000
South American Joint Venture [Member] | US Dollar Denominated Loans [Member]
Related Party Transaction [Line Items]
Weighted average interest rate	0.00%
South American Joint Venture [Member] | Chilean Peso Denominated Loans [Member]
Related Party Transaction [Line Items]
Weighted average interest rate	5.82%
BaySaver [Member]
Related Party Transaction [Line Items]
Company's ownership percentage			65.00%
Borrowings outstanding				$ 500,000
Tigre-ADS USA [Member]
Related Party Transaction [Line Items]
Company's ownership percentage	49.00%	49.00%	49.00%
Purchases from related party	$ 2,000,000	$ 1,600,000	$ 700,000
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Related Party Transaction [Line Items]
Guarantee percentage on credit facility	100.00%
Maximum potential guarantee payments	$ 12,000,000
Guarantee description	The Company is the guarantor of 100% of the ADS Mexicana Revolving Credit Facility
Credit Facility Arrangement with Scotia Bank [Member]
Related Party Transaction [Line Items]
Revolving cedit facility maturity date	Dec. 11, 2017
ADS Mexicana [Member]
Related Party Transaction [Line Items]
Outstanding letters of credit		$ 1,500,000
ADS Mexicana [Member] | Credit Facility Arrangement with Scotia Bank [Member]
Related Party Transaction [Line Items]
Amount borrowed under revolving credit facility					$ 3,900,000	$ 3,000,000
Interest rate for the loaned amount					4.81%	4.81%

Debt - Long-Term Debt (Detail)

Debt - Long-Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 11, 2017	Mar. 31, 2017
Debt Instrument [Line Items]
Total	$ 300,776		$ 350,361
Unamortized debt issuance costs	(3,028)		(1,723)
Current maturities	(26,848)		(37,789)
Long-term debt obligations	270,900		310,849
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility	13,000
Equipment Financing [Member]
Debt Instrument [Line Items]
Revolving credit facility	3,336		4,216
ADS [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility	171,500		194,300
ADS Mexicana [Member]
Debt Instrument [Line Items]
Revolving credit facility			1,500
ADS Mexicana [Member] | Scotia Bank Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility		$ 0	1,000
Term Note [Member]
Debt Instrument [Line Items]
Term Note			72,500
Senior Notes Payable [Member]
Debt Instrument [Line Items]
Senior notes	125,000		75,000
Industrial Revenue Bonds [Member]
Debt Instrument [Line Items]
Industrial revenue bonds	$ 940		$ 1,845

Debt (Secured Bank Loans) - Add

Debt (Secured Bank Loans) - Additional Information (Detail)	Jun. 28, 2017USD ($)	Jun. 22, 2017USD ($)	Mar. 31, 2018USD ($)Covenant	Jun. 30, 2017	Mar. 31, 2018USD ($)Covenant	Mar. 31, 2017USD ($)
Debt Instrument [Line Items]
Number of financial covenants | Covenant					2
ADS Mexicana [Member]
Debt Instrument [Line Items]
Outstanding letters of credit						$ 1,500,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowings permitted under credit facility		$ 550,000,000
Line of credit facility, Increase		$ 150,000,000
Outstanding letters of credit			$ 13,000,000		$ 13,000,000
Borrowing under line of credit facility			$ 12,000,000		$ 12,000,000
Weighted average interest rate			3.39%		3.39%
Credit agreement expiration date			Jun. 22, 2022
Revolving Credit Facility [Member] | ADS Mexicana [Member]
Debt Instrument [Line Items]
Maximum borrowings permitted under credit facility						$ 12,000,000
Borrowing under line of credit facility			$ 365,500,000		$ 365,500,000
Secured Bank Loans [Member]
Debt Instrument [Line Items]
Number of financial covenants | Covenant			2
Debt instrument, description			The Credit Agreement Leverage Ratio generally requires that at the end of any fiscal quarter, for the four fiscal quarters then ended, the Company will not permit the ratio of its total consolidated indebtedness to the Company’s Consolidated EBITDA (as defined in the Credit Agreement) to be greater than 4.00 to 1.00 (or 4.25 to 1.00 as of the date of any acquisitions permitted under the Credit Agreement for which the aggregate consideration is $100.0 million or greater).
Secured Bank Loans [Member] | Interest Rate Swaps [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Description of variable rate basis	30-Day LIBOR
Notional amount	$ 100,000,000
Fixed rate of interest	1.8195%
Maturity period	5 years
Secured Bank Loans [Member] | Minimum [Member]
Debt Instrument [Line Items]
Ratio of indebtedness		0.0400
Secured Bank Loans [Member] | Maximum [Member]
Debt Instrument [Line Items]
Ratio of indebtedness		0.0425
Aggregate consideration		$ 100,000
Ratio of EBITDA to Interest expense payable				0.0300

Debt (Senior Notes) - Additiona

Debt (Senior Notes) - Additional Information (Detail)	Jun. 28, 2017USD ($)	Jun. 22, 2017USD ($)	Mar. 31, 2018Covenant
Debt Instrument [Line Items]
Number of financial covenants | Covenant			2
Secured Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, description			The Private Self Agreement Leverage Ratio generally requires that at the end of any fiscal quarter, for the four fiscal quarters then ended, the Company will not permit the ratio of its total consolidated indebtedness to the Company’s Consolidated EBITDA (as defined in the Private Shelf Agreement) to be greater than 4.00 to 1.00 (or 4.25 to 1.00 as of the date of any acquisitions permitted under the Private Self Agreement for which the aggregate consideration is $100.0 million or greater).
Secured Senior Notes [Member] | Shelf Notes [Member]
Debt Instrument [Line Items]
Maturity period	7 years
Principal amount	$ 75,000,000
Fixed rate of interest	3.53%
Debt instrument leverage fee			The rate is subject to an additional 100 basis point excess leverage fee if the calculated leverage ratio exceeds 3 to 1 at the end of a fiscal quarter.
Excess leverage fee	10.00%
Secured Senior Notes [Member] | Maximum [Member]
Debt Instrument [Line Items]
Senior notes		$ 175,000,000
Ratio of indebtedness		0.0425
Aggregate consideration		$ 100,000,000
Ratio of EBITDA to Interest expense payable		0.0300
Secured Senior Notes [Member] | Minimum [Member]
Debt Instrument [Line Items]
Maturity period		10 years
Ratio of indebtedness		0.0400
Secured Senior Notes [Member] | Minimum [Member] | Shelf Notes [Member]
Debt Instrument [Line Items]
Calculated leverage ratio for additional fee	3.00%

Debt (Master Loan and Security

Debt (Master Loan and Security Agreement) - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2017	Jun. 30, 2016
Security Agreement for Equipment Financing [Member] | Maximum [Member]
Debt Instrument [Line Items]
Intercompany loans outstanding		$ 4,500,000
Equipment Notes [Member]
Debt Instrument [Line Items]
Equipment notes	$ 4,600,000
Weighted average fixed interest rate	2.72%
Aggregate loan amount	$ 4,200,000
Amortization period of the principal amount	5 years

Debt (Secured Bank Term Loans)

Debt (Secured Bank Term Loans) - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2017	Jun. 22, 2017	Mar. 31, 2016
Debt Instrument [Line Items]
Revolving credit facility interest rate	2.61%		2.70%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility outstanding		$ 550,000,000
Line of credit facility expiration date	2018-06
Revolving Credit Facility [Member] | ADS [Member]
Debt Instrument [Line Items]
Revolving credit facility outstanding	$ 325,000,000
Revolving Credit Facility [Member] | ADS Mexicana [Member]
Debt Instrument [Line Items]
Revolving credit facility outstanding	12,000,000
Revolving Credit Facility [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility outstanding	$ 100,000,000
Term loan maturity date	2018-06

Debt (Senior Notes Payable) - A

Debt (Senior Notes Payable) - Additional Information (Detail) - Senior Notes Payable [Member] $ in Millions	1 Months Ended
	Dec. 31, 2009USD ($)
Debt Instrument [Line Items]
Quarterly interest payable	5.60%
Senior notes	$ 75
Principal payment	25
ADS [Member]
Debt Instrument [Line Items]
Senior Notes	$ 100

Debt (Industrial Revenue Bonds)

Debt (Industrial Revenue Bonds) - Additional Information (Detail) - Industrial Revenue Bonds [Member] $ in Millions	12 Months Ended
	Mar. 31, 2018USD ($)Facility	Mar. 31, 2015Bond	Mar. 31, 2011Bond
Debt Instrument [Line Items]
Number of production facilities | Facility	4
Letter of Credit [Member]
Debt Instrument [Line Items]
Debt instrument fee percentage	1.75%
Nontaxable Municipal Bonds [Member]
Debt Instrument [Line Items]
Number of bonds retired | Bond		1	2
Average interest rate	3.42%
Collateral amount | $	$ 9.1

Debt (ADS Mexicana Scotia Bank

Debt (ADS Mexicana Scotia Bank Revolving Credit Facility ) - Additional Information (Detail) - ADS Mexicana [Member] - USD ($) $ in Thousands	Dec. 11, 2017	Dec. 11, 2014	Mar. 31, 2017
Debt Instrument [Line Items]
Outstanding letters of credit			$ 1,500
Scotia Bank Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving cedit facility maturity date		Dec. 11, 2017
Current borrowing capacity		$ 5,000
Outstanding letters of credit	$ 0		$ 1,000
Scotia Bank Revolving Credit Facility [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Interest percentage	1.60%

Debt - Maturities of Long-term

Debt - Maturities of Long-term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Debt Disclosure [Abstract]
2,018	$ 26,848
2,019	25,936
2,020	960
2,021	532
2,022	171,500
Thereafter	75,000
Total	$ 300,776	$ 350,361

Debt (Fiscal Year 2017 Amendmen

Debt (Fiscal Year 2017 Amendments and Consents Related to the Secured Bank Term Loans and Senior Notes) - Additional Information (Detail) - $ / shares	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jul. 31, 2016	Jun. 30, 2016
Debt Instrument [Line Items]
Cash dividends declared per share			$ 0.06		$ 0.06
Common Stock [Member]
Debt Instrument [Line Items]
Cash dividends declared per share		$ 0.06		$ 0.06
Preferred Stock [Member]
Debt Instrument [Line Items]
Cash dividends declared per share	$ 0.0195

Derivative Transactions - Summa

Derivative Transactions - Summary of Fair Values for Various Derivatives (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Receivables [Member] | Diesel Fuel Option Collars and Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset	$ 573	$ 149
Receivables [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset	311
Other Assets [Member] | Diesel Fuel Option Collars and Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset	23	30
Other Assets [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset	2,490
Other Accrued Liabilities [Member] | Diesel Fuel Option Collars and Swaps [Member]
Derivatives, Fair Value [Line Items]
(Liability)	(78)	(122)
Other Liabilities [Member] | Diesel Fuel Option Collars and Swaps [Member]
Derivatives, Fair Value [Line Items]
(Liability)	$ (38)	$ (20)

Derivative Transactions - Sched

Derivative Transactions - Schedule of Cash Settlements and Net Losses and Net (Gains) on Mark-to-Market Adjustments for Changes in Fair Value of Derivative Contracts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Derivatives, Fair Value [Line Items]
Total net unrealized mark to market losses (gains)	$ (3,244)	$ (10,921)	$ 2,163
Total net realized losses (gains)	(476)	8,564	14,734
Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Total net unrealized mark to market losses (gains)	(2,801)	(252)	(513)
Foreign Exchange Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Total net unrealized mark to market losses (gains)			28
Total net realized losses (gains)			(150)
Diesel Fuel Option Collars [Member]
Derivatives, Fair Value [Line Items]
Total net unrealized mark to market losses (gains)	(443)	(2,642)	(237)
Total net realized losses (gains)	$ (476)	1,893	3,142
Propylene Swaps [Member]
Derivatives, Fair Value [Line Items]
Total net unrealized mark to market losses (gains)		(8,027)	2,885
Total net realized losses (gains)		$ 6,671	$ 11,742

Commitments and Contingencies (

Commitments and Contingencies (Purchase Commitments) - Additional Information (Detail) - Inventory [Member] $ in Millions	12 Months Ended
	Mar. 31, 2018USD ($)
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase contracts period range, start	1 month
Purchase contracts period range, end	12 months
Total purchase commitment	$ 13.3

Commitments and Contingencie101

Commitments and Contingencies (Litigation and Other Proceedings) - Additional Information (Detail) - USD ($) $ in Millions	Jan. 24, 2018	Mar. 31, 2018
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Litigation settlement amount	$ 1.8	$ 2
Litigation settlement amount	$ 1.8
Maximum [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Litigation settlement amount		$ 2

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Average fair value of shares allocated under ESOP, per share		$ 18.40	$ 16.58	$ 19.20
Compensation expense related to allocation of ESOP shares		$ 11,700,000	$ 9,600,000	$ 10,300,000
Trustee retained for dividends on unallocated ADS shares		3,200,000	2,900,000	2,500,000
Defined contribution postretirement benefit plan, costs recognized		700,000	800,000	600,000
Profit-Sharing Plan [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Contribution to the profit sharing plan		0	0	0
Other Liabilities [Member] | Executive Retirement Expense [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Executive termination payment obligation		6,100,000	5,100,000
General and Administrative Expenses [Member] | Executive Retirement Expense [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Compensation expense (benefit)		$ 1,500,000	$ 1,100,000	$ (300,000)
Redeemable Convertible Preferred Stock [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Fair value of shares allocated under ESOP, per share		$ 20	$ 16.80	$ 16.35
Preferred stock, redemption value per share		$ 0.781
Preferred stock, unpaid cumulative dividends		$ 0
Preferred stock, dividend rate percentage		2.50%
Convertible preferred stock, converted to common stock		0.7692
Dividend record date		Mar. 15, 2018	Mar. 15, 2017	Mar. 15, 2016
Employee stock ownership plan number of shares approved by the board of directors to the plan		600,000	600,000
Employee stock ownership plan allocated as shares		7,437,000	7,779,000
Redeemable Convertible Preferred Stock [Member] | Dividend Declared [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Employee stock ownership plan allocated as shares		100,000	100,000
Redeemable Convertible Preferred Stock [Member] | Scenario Forecast [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Preferred stock, dividend rate percentage	2.50%
Dividend record date	Mar. 1, 2018
Dividend to be paid	Mar. 31, 2018
Employee Stock Ownership Plan E S O P Plan [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Number of days, share of redeemable convertible preferred stock converted into common stock following repayment of the ESOP Loan		30 days
Employee stock ownership plan participation description		Employees of ADS who have reached the age of 18 are generally eligible to participate in the Plan on March 31 after six months of service.
Employee stock ownership plan stock ownership description		Upon attainment of age 50 and seven years of participation in the Plan, a participant may elect to diversify specified percentages of the number of shares of ADS stock credited to the participant’s ESOP stock account in compliance with applicable law.
Employee Stock Ownership Plan E S O P Plan [Member] | ADS [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Debt instrument, term		30 years

Employee Benefit Plans - Summar

Employee Benefit Plans - Summarized Cash and Stock Dividends on Allocated Redeemable Convertible Preferred Stock (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2016	Jun. 30, 2016
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Dividend	$ 134	$ 134	$ 132
Required dividend per share				$ 0.06	$ 0.06
Redeemable Convertible Preferred Stock [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Total cash dividends	1,724	1,512
Total ESOP required dividends	$ 145	$ 152
Allocated shares	7,437	7,779
Required dividend per share	$ 0.0195	$ 0.0195
Redeemable Convertible Preferred Stock [Member] | Quarterly Cash Dividends [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Total cash dividends	$ 1,713	$ 1,494
Redeemable Convertible Preferred Stock [Member] | Annual Cash Dividend [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Total cash dividends	11	18
Annual cash dividend	11	18
Redeemable Convertible Preferred Stock [Member] | Annual Stock Dividend
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Dividend	$ 134	$ 134

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock-based Compensation Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense (benefit)	$ 7,121	$ 8,307	$ (5,868)
Non-Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense (benefit)	1,232	1,318
Liability-Classified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense (benefit)		4,936	(6,784)
Equity-Classified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense (benefit)	4,148	108
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense (benefit)	1,741	1,945	916
Cost of Goods Sold [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense (benefit)	179	177	(300)
Selling Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense (benefit)	105	177	(500)
General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation expense (benefit)	$ 6,837	$ 7,953	$ (5,068)

Stock-Based Compensation (Stock

Stock-Based Compensation (Stock Options) - Additional Information (Detail) $ in Thousands	12 Months Ended
	Mar. 31, 2018USD ($)Installmentshares	Mar. 31, 2017USD ($)shares	Mar. 31, 2016USD ($)shares	Apr. 01, 2017USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Paid-in capital	$ 364,908	$ 755,787		$ 13,700
2000 Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of options vested | shares	0	0	0
Weighted average fair value of options granted | shares	0	0	0
Aggregate intrinsic value of options outstanding	$ 1,600
Aggregate intrinsic value of options exercisable	1,100
Intrinsic value of options exercised	500	$ 3,700	$ 3,700
2000 Stock Option Plan [Member] | Liability-Classified Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based awards, unrecognized compensation expense	$ 200
Unrecognized compensation cost, weighted average service period for recognition	3 years 3 months 18 days
2000 Stock Option Plan [Member] | Liability-Classified Stock Options [Member] | Management [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock awards, expiration period	10 years
Stock awards, number of annual installments for vesting | Installment	3
Stock based awards, shares available for grant | shares	0
2013 Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based awards, shares available for grant | shares	0
Stock-based awards, unrecognized compensation expense	$ 2,400
Unrecognized compensation cost, weighted average service period for recognition	1 year 6 months
Fair value of options vested | shares	(541,000)
Weighted average fair value of options granted | shares	3,000
2013 Stock Option Plan [Member] | Management [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock awards, expiration period	10 years
2013 Stock Option Plan [Member] | Management [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock awards, number of annual installments for vesting | Installment	3
2013 Stock Option Plan [Member] | Management [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock awards, number of annual installments for vesting | Installment	5
2013 Stock Option Plan [Member] | Former Chief Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock awards, expiration period	10 years
Stock-based awards, vesting period	4 years
2013 Stock Option Plan [Member] | Liability-Classified Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate intrinsic value of options outstanding	$ 14,500
Aggregate intrinsic value of options exercisable	11,400
Intrinsic value of options exercised	4,400
Intrinsic value of options vested	$ 4,700	$ 3,400	$ 3,600

Stock-Based Compensation - S106

Stock-Based Compensation - Summary of Assumption Used in Estimate Fair Value of Stock Options (Detail) - $ / shares	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected stock price volatility, minimum	32.10%	29.60%	31.10%
Expected stock price volatility, maximum	35.60%	33.00%	39.30%
Risk-free interest rate, minimum	1.90%	0.90%	0.50%
Risk-free interest rate, maximum	2.20%	1.90%	1.50%
Dividend yield		0.90%	0.90%
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock price	$ 19.35	$ 18.70	$ 18.34
Weighted-average expected option life (years)	5 years 7 months 6 days	6 months	6 months
Dividend yield	1.10%
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock price	$ 22.95	$ 28.17	$ 33.03
Weighted-average expected option life (years)	6 years	5 years 1 month 6 days	6 years 2 months 12 days
Dividend yield	1.50%

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
2000 Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Outstanding, Beginning Balance	195,000
Number of Shares, Granted	0	0	0
Number of Shares, Exercised	(55,000)
Number of Shares, Forfeited	(5,000)
Number of Shares, Outstanding, Ending Balance	135,000	195,000
Number of Shares, Vested at end of year	81,000
Number of Shares, Unvested at end of year	54,000	59,000
Number of Shares, Vested and expected to vest at end of year	0
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 13.31
Weighted Average Exercise Price, Granted	0
Weighted Average Exercise Price, Exercised	11.73
Weighted Average Exercise Price, Forfeited	15.74
Weighted Average Exercise Price, Outstanding, Ending Balance	13.85	$ 13.31
Weighted Average Exercise Price, Vested at end of period	12.61
Weighted Average Exercise Price, Unvested at end of year	15.74
Weighted Average Exercise Price, Fair value of options granted during the year	$ 0
Weighted Average Remaining Contractual Term (in years), Outstanding	4 years 9 months 18 days	5 years 4 months 24 days
Weighted Average Remaining Contractual Term (in years), Vested at end of year	4 years 1 month 6 days
Weighted Average Remaining Contractual Term (in years), Unvested at end of year	6 years
2013 Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Outstanding, Beginning Balance	2,260,000
Number of Shares, Granted	3,000
Number of Shares, Exercised	(618,000)
Number of Shares, Forfeited	(143,000)
Number of Shares, Outstanding, Ending Balance	1,502,000	2,260,000
Number of Shares, Vested at end of year	1,063,000
Number of Shares, Unvested at end of year	439,000	1,120,000
Number of Shares, Vested and expected to vest at end of year	0
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 16.04
Weighted Average Exercise Price, Granted	22.95
Weighted Average Exercise Price, Exercised	13.65
Weighted Average Exercise Price, Forfeited	24.20
Weighted Average Exercise Price, Outstanding, Ending Balance	16.27	$ 16.04
Weighted Average Exercise Price, Vested at end of period	15.10
Weighted Average Exercise Price, Unvested at end of year	19.09
Weighted Average Exercise Price, Fair value of options granted during the year	$ 7.53
Weighted Average Remaining Contractual Term (in years), Outstanding	5 years 10 months 24 days	6 years 8 months 12 days
Weighted Average Remaining Contractual Term (in years), Vested at end of year	5 years 4 months 24 days
Weighted Average Remaining Contractual Term (in years), Unvested at end of year	6 years 6 months
2017 Omnibus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Granted	198,000
Number of Shares, Outstanding, Ending Balance	198,000
Number of Shares, Unvested at end of year	198,000
Number of Shares, Vested and expected to vest at end of year	0
Weighted Average Exercise Price, Granted	$ 19.75
Weighted Average Exercise Price, Outstanding, Ending Balance	19.75
Weighted Average Exercise Price, Unvested at end of year	19.75
Weighted Average Exercise Price, Fair value of options granted during the year	$ 5.94
Weighted Average Remaining Contractual Term (in years), Outstanding	9 years 4 months 24 days
Weighted Average Remaining Contractual Term (in years), Unvested at end of year	9 years 4 months 24 days

Stock-Based Compensation - S108

Stock-Based Compensation - Summary of Unvested Stock Option Grants (Detail) - $ / shares	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
2000 Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Unvested at beginning of year	59,000
Number of Shares, Granted	0	0	0
Number of Shares, Vested	0	0	0
Number of Shares, Forfeitures	(5,000)
Number of Shares, Unvested at end of year	54,000	59,000
Weighted Average Grant Date Fair Value, Unvested at beginning of year	$ 6.76
Weighted Average Grant Date Fair Value, Granted	0
Weighted Average Grant Date Fair Value, Forfeitures	6.76
Weighted Average Grant Date Fair Value, Unvested at end of year	$ 6.76	$ 6.76
2013 Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Unvested at beginning of year	1,120,000
Number of Shares, Granted	3,000
Number of Shares, Vested	(541,000)
Number of Shares, Forfeitures	(143,000)
Number of Shares, Unvested at end of year	439,000	1,120,000
Weighted Average Grant Date Fair Value, Unvested at beginning of year	$ 8.51
Weighted Average Grant Date Fair Value, Granted	7.53
Weighted Average Grant Date Fair Value, Vested	8.76
Weighted Average Grant Date Fair Value, Forfeitures	7.99
Weighted Average Grant Date Fair Value, Unvested at end of year	$ 8.42	$ 8.51
2017 Omnibus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Granted	198,000
Number of Shares, Unvested at end of year	198,000
Weighted Average Grant Date Fair Value, Granted	$ 5.94
Weighted Average Grant Date Fair Value, Unvested at end of year	$ 5.94
Non Employee Director Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Unvested at beginning of year	40,000
Number of Shares, Vested	(40,000)
Number of Shares, Unvested at end of year		40,000
Weighted Average Grant Date Fair Value, Unvested at beginning of year	$ 24.20
Weighted Average Grant Date Fair Value, Unvested at end of year		$ 24.20

Stock-Based Compensation (2008

Stock-Based Compensation (2008 Restricted Stock Plan) - Additional Information (Detail) - 2008 Restricted Stock Plan [Member] - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based awards, vesting period	5 years
Stock based awards, shares available for grant	0
Unrecognized compensation expense	$ 1.9
Unrecognized compensation cost, weighted average service period for recognition	1 year 8 months 12 days
Weighted average fair value of options granted	$ 22.15	$ 24.20
Intrinsic value of options vested	$ 2.9	$ 1.2	$ 1.1

Stock-Based Compensation - S110

Stock-Based Compensation - Summary of Unvested Restricted Stock Grants (Detail) shares in Thousands	12 Months Ended
	Mar. 31, 2018$ / sharesshares
2008 Restricted Stock Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Unvested at beginning of year | shares	254
Number of shares, Granted | shares	1
Number of Shares, Vested | shares	(151)
Number of Shares, Forfeited | shares	(3)
Number of Shares, Unvested at end of year | shares	101
Weighted Average Grant Date Fair Value, Unvested at beginning of year | $ / shares	$ 21.92
Weighted Average Grant Date Fair Value, Granted | $ / shares	22.15
Weighted Average Grant Date Fair Value, Vested | $ / shares	21.25
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	22.49
Weighted Average Grant Date Fair Value, Unvested at end of year | $ / shares	$ 22.95
2017 Omnibus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares, Granted | shares	108
Number of Shares, Unvested at end of year | shares	108
Weighted Average Grant Date Fair Value, Granted | $ / shares	$ 19.91
Weighted Average Grant Date Fair Value, Unvested at end of year | $ / shares	$ 19.91

Stock-Based Compensation (2017

Stock-Based Compensation (2017 Omnibus Plan) - Additional Information (Detail) - 2017 Omnibus Plan [Member] - USD ($)	12 Months Ended
	Mar. 31, 2018	May 24, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for awards	3,300,000
Stock-based awards, unrecognized compensation expense	$ 900,000
Unrecognized compensation cost, weighted average service period for recognition	2 years 4 months 24 days
Aggregate intrinsic value of options outstanding	$ 1,200,000
Intrinsic value of options vested	0
Intrinsic value of options exercised	$ 0
Weighted average fair value of options granted	$ 5.94
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost, weighted average service period for recognition	2 years 4 months 24 days
Unrecognized compensation expense	$ 1,200,000
Weighted average fair value of options granted	$ 19.91
Number of Shares, Vested	0
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock approved for issuance		3,500,000

Stock-Based Compensation (Non-E

Stock-Based Compensation (Non-Employee Director Compensation) - Additional Information (Detail) - Non Employee Director Compensation Plan [Member] $ in Millions	12 Months Ended
	Mar. 31, 2018USD ($)shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based awards, number of shares authorized for grant	300,000
Stock-based awards, vesting period from the date of issuance	1 year
Shares available for grant	0
Unrecognized compensation expense | $	$ 0

Income Taxes - Income Before In

Income Taxes - Income Before Income Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
United States	$ 72,109	$ 59,543	$ 45,159
Foreign	4,833	5,288	14,140
Income before income taxes	$ 76,942	$ 64,831	$ 59,299

Income Taxes - Schedule of Inco

Income Taxes - Schedule of Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Current:
Federal			$ 17,107	$ 24,318	$ 6,889
State and local			3,541	4,652	2,126
Foreign			2,242	3,040	3,791
Total current tax expense	$ 800		22,890	32,010	12,806
Deferred:
Federal			(11,236)	(5,887)	10,019
State and local			(55)	(1,297)	1,431
Foreign			(188)	(211)	(758)
Total deferred tax expense (benefit)	$ (1,300)	$ (14,700)	(11,479)	(7,395)	10,692
Total Income tax expense		$ 4,400	$ 11,411	$ 24,615	$ 23,498

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Effective Tax Rate and Statutory Federal Income Tax Rate (Detail)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	35.00%	31.50%	35.00%	35.00%
ESOP stock appreciation			5.40%	4.10%	5.00%
Effect of tax rate of foreign subsidiaries			0.70%	1.30%	0.80%
State and local taxes—net of federal income tax benefit			3.60%	4.10%	4.30%
Stock-based compensation			0.50%	0.30%	(1.80%)
Uncertain tax position change			0.30%	(1.10%)	(3.60%)
Impact of tax reform			(19.40%)
Return to provision - federal and state			(5.00%)	1.10%
Qualified production activity deduction			(2.50%)	(3.30%)	(0.90%)
Closure of Puerto Rico				(4.20%)
Other			(0.30%)	0.70%	0.80%
Effective rate			14.80%	38.00%	39.60%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Change in corporate income taxes	21.00%		35.00%	31.50%	35.00%	35.00%
Deferred tax benefit	$ (1,300)	$ (14,700)		$ (11,479)	$ (7,395)	$ 10,692
Total deferred tax benefit				(16,000)
Undistributed earnings on foreign subsidiaries		33,200	$ 33,200
Provisional income tax expense		4,400		11,411	24,615	23,498
U.S federal cash taxes		$ 900		1,000
Income tax expense	800			22,890	32,010	12,806
Transition tax expense				5,200
Unrecognized tax benefit that would decrease income tax expense	7,593			7,593	6,196	$ 7,998	$ 10,452
Decrease in unrecognized tax benefit related to income tax expense	7,600			7,600
Accrued interest and penalties related to unrecognized tax benefits	$ 2,100			$ 2,100	$ 1,800

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Deferred tax assets:
State income taxes	$ 1,126	$ 1,474
ESOP loan repayment	891	1,363
Receivable and other allowances	1,696	2,660
Inventory	3,558	5,820
Non-qualified stock options	3,596	6,052
Executive termination payments (Note 15)	1,299	2,044
Worker’s compensation	732	1,323
Foreign net operating losses	445	2,223
Other	2,441	3,359
Total deferred tax assets	15,784	26,318
Less: valuation allowance	(26)	(2,223)
Total net deferred tax assets	15,758	24,095
Deferred tax liabilities:
Intangible assets	4,254	9,728
Property, plant and equipment	38,181	52,322
Goodwill	3,698	3,886
Other	1,814	1,464
Total deferred tax liabilities	47,947	67,400
Net deferred tax liability	$ 32,189	$ 43,305

Income Taxes - Net Deferred Tax

Income Taxes - Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Net non-current deferred tax assets	$ 115	$ 702
Net non-current deferred tax liabilities	$ 32,304	$ 44,007

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 6,196	$ 7,998	$ 10,452
Tax positions taken in current year	81		917
Decreases in tax positions for prior years		(1,786)	(599)
Increases in tax positions for prior years	5,108	80	358
Lapse of statute of limitations	(3,940)	(96)	(3,130)
Foreign translation adjustment	148
Balance at end of year	$ 7,593	$ 6,196	$ 7,998

Net Income Per Share and Sto120

Net Income Per Share and Stockholders' Equity - Summary of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
NET INCOME PER SHARE — BASIC:
Net income attributable to ADS	$ (5,703)	$ 32,105	$ 17,863	$ 17,742	$ (18,110)	$ 9,053	$ 23,734	$ 18,273	$ 62,007	$ 32,950	$ 25,052
Accretion of redeemable noncontrolling interest in subsidiaries										(1,560)	(932)
Dividends paid to redeemable convertible preferred stockholders									(1,858)	(1,646)	(1,425)
Dividends paid to unvested restricted stockholders									(49)	(73)	(24)
Net income available to common stockholders and participating securities									60,100	29,671	22,671
Undistributed income allocated to participating securities									(4,514)	(1,700)	(1,270)
Net income available to common stockholders — Basic									$ 55,586	$ 27,971	$ 21,401
Weighted average number of common shares outstanding — Basic									55,696	54,919	53,978
Net income per common share — Basic	$ (0.11)	$ 0.52	$ 0.29	$ 0.29	$ (0.34)	$ 0.14	$ 0.38	$ 0.29	$ 1	$ 0.51	$ 0.40
NET INCOME PER SHARE — DILUTED:
Net income available to common stockholders — Diluted									$ 55,586	$ 27,971	$ 21,401
Weighted average number of common shares outstanding — Basic									55,696	54,919	53,978
Assumed exercise of stock options									638	705	1,198
Weighted average number of common shares outstanding — Diluted									56,334	55,624	55,176
Net income per common share — Diluted	$ (0.11)	$ 0.51	$ 0.29	$ 0.28	$ (0.34)	$ 0.14	$ 0.38	$ 0.29	$ 0.99	$ 0.50	$ 0.39
Potentially dilutive securities excluded as anti- dilutive									6,167	6,228	6,383

Net Income Per Share and Sto121

Net Income Per Share and Stockholders' Equity - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	Nov. 01, 2017	Mar. 31, 2018	Feb. 28, 2017
Equity Class Of Treasury Stock [Line Items]
Repurchases of common stock		$ 7,947
Stock repurchase program amount authorized			$ 50,000
Common Stock [Member]
Equity Class Of Treasury Stock [Line Items]
Common stock repurchases, Shares		400
Repurchases of common stock		$ 7,900
Stock repurchase program amount authorized		$ 42,100
Treasury stock retired	97,700	97,745

Other Accrued Liabilities - Sch

Other Accrued Liabilities - Schedule of Other Accrued Liabilities (Detail) - USD ($) $ in Thousands		Mar. 31, 2018	Mar. 31, 2017
Payables And Accruals [Abstract]
Accrued compensation and benefits	[1]	$ 17,980	$ 17,066
Accrued rebate liability	[2]	12,938	8,480
Self-insurance accruals		12,439	8,559
Current portion of liability-classified stock-based awards			11,926
Other		17,203	20,355
Total accrued liabilities		$ 60,560	$ 66,386
[1]	Accrued compensation and benefits is primarily comprised of accrued payroll, bonuses and commissions.
[2]	Accrued rebate liability represents the Company’s estimated rebates to be paid to customers.

Business Segment Information -

Business Segment Information - Additional Information (Detail)	12 Months Ended
	Mar. 31, 2018Segment
Segment Reporting [Abstract]
Number of reportable segments	2
Number of operating segments	2

Business Segment Information124

Business Segment Information - Schedule of Revenue from Reportable Segments by Product Type (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Total net sales	$ 250,114	$ 320,832	$ 401,049	$ 358,359	$ 244,184	$ 294,716	$ 360,785	$ 357,576	$ 1,330,354	$ 1,257,261	$ 1,290,678
Domestic [Member]
Segment Reporting Information [Line Items]
Total net sales									1,174,432	1,102,236	1,113,796
Domestic [Member] | Pipe [Member]
Segment Reporting Information [Line Items]
Total net sales									835,421	786,546	812,071
Domestic [Member] | Allied Products [Member]
Segment Reporting Information [Line Items]
Total net sales									339,011	315,690	301,725
International Segment [Member]
Segment Reporting Information [Line Items]
Total net sales									155,922	155,025	176,882
International Segment [Member] | Pipe [Member]
Segment Reporting Information [Line Items]
Total net sales									118,644	122,384	139,731
International Segment [Member] | Allied Products [Member]
Segment Reporting Information [Line Items]
Total net sales									$ 37,278	$ 32,641	$ 37,151

Business Segment Information125

Business Segment Information - Schedule of Additional Financial Information Attributable to Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA		$ 210,230	$ 193,371	$ 187,340
Interest expense		15,262	17,467	18,460
Income tax expense	$ 4,400	11,411	24,615	23,498
Depreciation and amortization		75,003	72,355	71,009
Equity in net (loss) income of unconsolidated affiliates		(739)	(4,308)	(5,234)
Capital expenditures		41,709	46,676	44,942
Investments in unconsolidated affiliates		12,343	8,986
Total identifiable assets		1,043,242	1,046,285
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Total identifiable assets		(4,298)	(5,708)
Domestic [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA		191,629	175,676	162,875
Interest expense		14,929	17,049	17,908
Income tax expense		9,199	21,786	20,465
Depreciation and amortization		66,978	63,747	62,625
Equity in net (loss) income of unconsolidated affiliates		(2,427)	(505)	181
Capital expenditures		39,562	39,642	37,242
Investments in unconsolidated affiliates			2,427
Total identifiable assets		904,718	917,006
International Segment [Member]
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA		18,601	17,695	24,465
Interest expense		333	418	552
Income tax expense		2,212	2,829	3,033
Depreciation and amortization		8,025	8,608	8,384
Equity in net (loss) income of unconsolidated affiliates		1,688	(3,803)	(5,415)
Capital expenditures		2,147	7,034	$ 7,700
Investments in unconsolidated affiliates		12,343	6,559
Total identifiable assets		$ 142,822	$ 134,987

Business Segment Information126

Business Segment Information - Schedule of Reconciliation of Segment Adjusted EBITDA to Net Income (Detail) - USD ($) $ in Thousands	Jan. 24, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income (loss)		$ (5,703)	$ 32,105	$ 17,863	$ 17,742	$ (18,110)	$ 9,053	$ 23,734	$ 18,273	$ 62,007	$ 32,950	$ 25,052
Interest expense										15,262	17,467	18,460
Income tax expense			$ 4,400							11,411	24,615	23,498
Fair market value adjustments to derivatives										(3,244)	(10,921)	2,163
Loss on disposal of assets and costs from exit and disposal activities										15,003	8,509	812
Stock-based compensation expense (benefit)										7,121	8,307	(5,868)
ESOP deferred stock-based compensation										11,700	9,600	10,300
Bargain purchase gain on PTI acquisition											(609)
Legal settlement	$ 1,800
Domestic [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income (loss)										57,279	35,118	24,875
Depreciation and amortization										66,978	63,747	62,625
Interest expense										14,929	17,049	17,908
Income tax expense										9,199	21,786	20,465
Fair market value adjustments to derivatives										(443)	(10,921)	2,139
Loss on disposal of assets and costs from exit and disposal activities										14,248	4,793	892
Unconsolidated affiliates interest, taxes, depreciation and amortization										1,181	1,088	1,052
Contingent consideration remeasurement										39	(265)	371
Stock-based compensation expense (benefit)										7,121	8,307	(5,868)
ESOP deferred stock-based compensation										11,724	9,568	10,250
Executive retirement expense (benefit)										1,473	1,092	(294)
Loss related to BaySaver step acquisition												490
Inventory step up related to PTI acquisition											525
Bargain purchase gain on PTI acquisition											(609)
Restatement-related costs										4,227	24,026	27,970
Legal settlement										2,000
Impairment on investment in unconsolidated affiliate										312
Transaction costs										1,362	372
Segment Adjusted EBITDA										191,629	175,676	162,875
International Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net income (loss)										7,513	790	5,692
Depreciation and amortization										8,025	8,608	8,384
Interest expense										333	418	552
Income tax expense										2,212	2,829	3,033
Fair market value adjustments to derivatives												24
Foreign currency transaction (gains) losses										(1,748)	(1,629)	697
Loss on disposal of assets and costs from exit and disposal activities										755	3,716	(80)
Unconsolidated affiliates interest, taxes, depreciation and amortization										1,511	1,663	2,163
Impairment on investment in unconsolidated affiliate											1,300	4,000
Segment Adjusted EBITDA										$ 18,601	$ 17,695	$ 24,465

Business Segment Information127

Business Segment Information - Net Sales and Long-Lived Asset by Geographic Location (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 250,114	$ 320,832	$ 401,049	$ 358,359	$ 244,184	$ 294,716	$ 360,785	$ 357,576	$ 1,330,354	$ 1,257,261	$ 1,290,678
Long-lived Assets	413,813				418,311				413,813	418,311
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									1,313,917	1,243,074	1,274,700
Long-lived Assets	401,470				411,752				401,470	411,752
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									16,437	14,187	$ 15,978
Long-lived Assets	$ 12,343				$ 6,559				$ 12,343	$ 6,559

Supplemental Disclosures of 128

Supplemental Disclosures of Cash Flow Information - Supplemental Disclosures Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Other Significant Noncash Transactions [Line Items]
Interest	$ 17,890	$ 17,273	$ 18,352
Income taxes	24,510	13,525	32,175
Redeemable convertible preferred stock dividend	134	134	132
Purchases of plant, property, and equipment included in accounts payable	1,258	2,549	1,165
ESOP distributions in common stock	11,566	7,425	10,250
Assets acquired and obligation incurred under capital lease	26,571	26,276	34,207
Lease obligation retired upon disposition of leased assets	636	390	134
Reclassification of liability-classified stock options and restricted stock to equity		4,147	3,702
Contribution of net accounts receivable to the South American Joint Venture	2,785
Payable recorded for business acquisition	$ 300	$ 950
Miscellaneous [Member]
Other Significant Noncash Transactions [Line Items]
Receivable recorded for sale of businesses			$ 150

Quarterly Financial Informat129

Quarterly Financial Information - Summary of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 250,114	$ 320,832	$ 401,049	$ 358,359	$ 244,184	$ 294,716	$ 360,785	$ 357,576	$ 1,330,354	$ 1,257,261	$ 1,290,678
Gross profit	48,115	77,826	89,801	86,739	39,251	69,441	90,512	96,606	302,481	295,810	285,352
Net (loss) income	(4,856)	33,215	17,959	18,474	(18,052)	10,258	24,281	19,421	64,792	35,908	30,567
Net income attributable to ADS	$ (5,703)	$ 32,105	$ 17,863	$ 17,742	$ (18,110)	$ 9,053	$ 23,734	$ 18,273	$ 62,007	$ 32,950	$ 25,052
Net (loss) income per share
Basic	$ (0.11)	$ 0.52	$ 0.29	$ 0.29	$ (0.34)	$ 0.14	$ 0.38	$ 0.29	$ 1	$ 0.51	$ 0.40
Diluted	$ (0.11)	$ 0.51	$ 0.29	$ 0.28	$ (0.34)	$ 0.14	$ 0.38	$ 0.29	$ 0.99	$ 0.50	$ 0.39

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - $ / shares	12 Months Ended
	Mar. 31, 2018	Jun. 30, 2018	Dec. 31, 2016	Sep. 30, 2016	Jul. 31, 2016	Jun. 30, 2016
Subsequent Event [Line Items]
Cash dividend declared				$ 0.06		$ 0.06
First Quarter [Member]
Subsequent Event [Line Items]
Dividend payable date	Jun. 15, 2018
Dividend payable, date of record	Jun. 5, 2018
Common Stock [Member]
Subsequent Event [Line Items]
Cash dividend declared			$ 0.06		$ 0.06
Common Stock [Member] | Scenario Forecast [Member]
Subsequent Event [Line Items]
Cash dividend declared		$ 0.08

Schedule II - Consolidated V131

Schedule II - Consolidated Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Valuation And Qualifying Accounts [Abstract]
Balance at beginning of period	$ 10,431	$ 7,956	$ 5,423
Charged to costs and expenses	503	2,940	3,542
Charged to other accounts	(391)	(13)	(81)
Deductions	(3,717)	(452)	(928)
Balance at end of period	$ 6,826	$ 10,431	$ 7,956

Schedule II - Consolidated V132

Schedule II - Consolidated Valuation and Qualifying Accounts (Parenthetical) (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
South American Joint Venture [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Allowance for doubtful accounts	$ 3	$ 3