Supplemental Balance Sheets and Statements of Operations Detail (Tables)

12 Months Ended

Mar. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of accounts receivable

	March 31,
(amounts in thousands)	2020			2019
Accounts receivable:
Trade	$	169,685		$	176,715
Allowance for doubtful accounts	(1,366		)	(1,206		)
Ship-from-stock and debit (“SFSD”) allowance	(21,896		)	(18,862		)
Returns allowance	(761		)	(964		)
Rebates allowance	(676		)	(967		)
Price protection allowance	(243		)	(657		)
Accounts receivable, net	$	144,743		$	154,059

Schedule of activity in allowances for accounts receivables

The following table presents the annual activities included in the allowance for these commitments (amounts in thousands):

Balance at March 31, 2017	$	20,414
Reduction in sales	94,660
Actual adjustments applied	(95,444		)
Other	268
Balance at March 31, 2018	19,898
Reduction in sales	99,538
Actual adjustments applied	(96,775		)
Other	(5		)
Balance at March 31, 2019	22,656
Reduction in sales	117,708
Actual adjustments applied	(115,582		)
Other	160
Balance at March 31, 2020	$	24,942

Schedule of components of inventories

	March 31,
(amounts in thousands)	2020			2019
Inventories:
Raw materials and supplies	$	93,464		$	97,119
Work in process	85,122			71,374
Finished goods	82,311			88,175
Inventory gross	260,897			256,668
Inventory reserves	(17,687		)	(15,539		)
Inventory, net	$	243,210		$	241,129

Schedule of the annual activities included in the allowance for commitments

The following table presents the annual activities included in the inventory reserves (amounts in thousands):

Balance at March 31, 2017	$	15,941
Costs charged to expense	4,994
Write-offs	(6,954		)
Other (1)	2,365
Balance at March 31, 2018	16,346
Costs charged to expense	6,019
Write-offs	(6,826		)
Other	—
Balance at March 31, 2019	15,539
Costs charged to expense	12,623
Write-offs	(10,867		)
Other	392
Balance at March 31, 2020	$	17,687

Schedule of Property, plant and equipment

	Useful life (years)	March 31,
(amounts in thousands, except years)		2020			2019
Property, plant and equipment:
Land and land improvements	20	$	56,340		$	62,232
Buildings	20 - 40	210,192			199,319
Machinery and equipment	10	977,806			916,737
Furniture and fixtures	4 - 10	109,770			82,306
Construction in progress		104,842			105,857
Other		10,541			9,280
Total property and equipment		1,469,491			1,375,731
Accumulated depreciation		(916,855		)	(880,451		)
Property, plant and equipment, net		$	552,636		$	495,280

Schedule of accrued expenses

	March 31,
(amounts in thousands)	2020		2019
Accrued expenses:
Salaries, wages, and related employee costs	$	39,605	$	61,880
Derivatives	13,992		—
Interest	47		211
Restructuring	1,744		1,869
Vacation	9,668		10,364
Lease obligations	8,960		947
Antitrust settlements and regulatory costs	75,086		9,517
Contract liabilities	6,035		256
Stock Returns	3,690		2,539
Property, sales, and other taxes	2,342		1,854
Other	6,453		4,324
Total accrued expenses	$	167,622	$	93,761

Schedule of other non-current obligations

	March 31,
(amounts in thousands)	2020		2019
Other non-current obligations:
Pension plans	$	79,512	$	82,717
Lease obligations	24,108		986
Employee separation liability	7,044		7,640
Deferred compensation	353		2,285
Contract liabilities	60,638		13,412
Customer deposits	3,742		3,689
Derivatives	6,295		—
Antitrust settlements and regulatory costs	—		13,168
Uncertain tax positions	6,306		2,415
Deferred rent	—		5,366
Government subsidies	1,677		1,247
Restructuring	89		312
Other	3,628		3,393
Total other non-current obligations	$	193,392	$	136,630

Schedule of other (income) expense, net

	Fiscal Years Ended March 31,
(amounts in thousands)	2020			2019			2018
Other (income) expense, net:
Net foreign exchange (gains) losses	$	(6,762	)	$	(7,230	)	$	13,145
Post retirement and pension plan non-service costs	439			366			210
Curtailment on pension plans	1,949			—			—
Loss on early extinguishment of debt	—			15,946			486
R&D grant reimbursements and grant income	(1,595		)	(4,559		)	(787		)
Other	1,613			(10		)	1,638
Total other (income) expense, net	$	(4,356	)	$	4,513		$	14,692