Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Operating Activities
Net (Loss) Income	$ (42,952)	$ (1,047,960)	$ 238,697
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	176,946	177,755	158,323
Asset Impairment Charges	266,298	874,361	0
Amortization of acquired contract liabilities	(121,004)	(132,363)	(75,733)
Gain (Loss) on Disposition of Business	19,124	0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	1,244	0
Accretion of debt discount	0	0	1,577
Other amortization included in interest expense	5,553	3,904	8,135
Provision for doubtful accounts receivable	202	1,996	172
Deferred Income Tax Expense (Benefit)	9,480	(118,302)	105,277
Employee stock-based compensation	7,922	2,657	1,272
Changes in assets and liabilities, excluding the effects of acquisitions and dispositions of businesses:
Trade and other receivables	112,196	73,083	69,500
Inventories	(272,653)	293,517	42,383
Prepaid expenses and other current assets	11,756	(6,958)	1,589
Accounts payable, accrued expenses and other current liabilities	211,560	53,914	95,167
Accrued pension and other postretirement benefits	(100,012)	(87,559)	(180,569)
Other	(2,894)	(2,938)	1,542
Net cash provided by operating activities	281,522	83,863	467,332
Investing Activities
Capital expenditures	(51,832)	(80,047)	(110,004)
Reimbursement Revenue	0	0	653
Proceeds from sale of assets	86,187	6,069	3,167
Acquisitions, net of cash acquired	9	(54,051)	38,281
Net cash used in investing activities	34,364	(128,029)	(67,903)
Financing Activities
Net increase (decrease) in revolving credit facility	(110,000)	(8,256)	(46,150)
Proceeds from issuance of long-term debt	24,400	134,797	508,960
Repayment of debt and capital lease obligations	(144,144)	(80,917)	(655,860)
Payment of deferred financing costs	(14,034)	(185)	(6,487)
Payments for Repurchase of Common Stock	0	0	(184,380)
Dividends paid	(7,927)	(7,889)	(8,100)
Repayment of governmental grant	(14,570)	(5,000)	(3,198)
Repurchase of restricted shares for minimum tax obligation	(182)	(96)	(673)
Proceeds from exercise of stock options, including excess tax benefit of $4,628, $1,880, and $150 in 2013, 2012, and 2011	0	0	720
Net cash (used in) provided by financing activities	(266,457)	32,454	(395,168)
Effect of exchange rate changes on cash	(780)	79	(642)
Net change in cash	48,649	(11,633)	3,619
Cash at beginning of period	20,984	32,617	28,998
Cash at end of period	69,633	20,984	32,617
Retained Earnings [Member]
Operating Activities
Net (Loss) Income	$ (42,952)	$ (1,047,960)	$ 238,697