Supplemental Balance Sheets and Statements of Operations Detail (Tables)

12 Months Ended

Mar. 31, 2019

Disclosure Text Block Supplement [Abstract]

Schedule of accounts receivable

	March 31,
(amounts in thousands)	2019			2018
Accounts receivable:
Trade	$	176,715		$	166,459
Allowance for doubtful accounts reserve	(1,206		)	(1,210		)
Ship-from-stock and debit (“SFSD”) reserve	(18,862		)	(17,362		)
Returns reserves (1)	(964		)	(131		)
Rebates reserves	(967		)	(446		)
Price protection reserves	(657		)	(420		)
Other	—			(329		)
Accounts receivable, net (1)	$	154,059		$	146,561

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, 2016	$	22,978
Reduction in sales	87,739
Actual adjustments applied	(90,365		)
Other	62
Balance at March 31, 2017	20,414
Reduction in sales	94,660
Actual adjustments applied (1)	(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

Schedule of components of inventories

	March 31,
(amounts in thousands)	2019			2018
Inventories:
Raw materials and supplies	$	97,119		$	88,408
Work in process	71,374			65,417
Finished goods	88,175			66,907
Inventory gross	256,668			220,732
Inventory reserves	(15,539		)	(16,346		)
Inventory, net	$	241,129		$	204,386

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, 2016	$	16,101
Costs charged to expense	6,163
Write-offs	(6,125		)
Other	(198		)
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

Schedule of Property, plant and equipment

	Useful life (years)	March 31,
(amounts in thousands, except years)		2019			2018
Property, plant and equipment:
Land and land improvements	20	$	62,232		$	66,150
Buildings	20 - 40	199,319			186,207
Machinery and equipment	10	916,737			895,914
Furniture and fixtures	4 - 10	82,306			72,811
Construction in progress		105,857			46,391
Other		9,280			4,457
Total property and equipment		1,375,731			1,271,930
Accumulated depreciation		(880,451		)	(866,614		)
Property, plant and equipment, net		$	495,280		$	405,316

Schedule of accrued expenses

	March 31,
(amounts in thousands)	2019		2018
Accrued expenses:
Salaries, wages, and related employee costs	$	61,880	$	62,778
Interest	211		396
Restructuring	1,869		8,719
Vacation	10,364		10,364
Anti-trust fines and settlements	9,517		33,696
Stock Returns (1)	2,539		2,485
Property, sales, and other taxes	1,854		1,571
Other (1)	5,527		5,110
Total accrued expenses (1)	$	93,761	$	125,119

Schedule of other non-current obligations

	March 31,
(amounts in thousands)	2019		2018
Other non-current obligations:
Pension plans	$	82,717	$	83,495
Employee separation liability	7,640		8,539
Deferred compensation	2,285		2,057
Customer deposits	3,689		3,800
Anti-trust fines and settlements	13,168		35,263
Uncertain tax positions	2,415		5,704
Deferred rent	5,366		3,840
Government subsidies	1,247		4,739
Deferred interest income-customer capacity agreements	2,142		—
Restructuring	312		1,240
Other (1)	4,379		3,572
Total other non-current obligations (1)	$	125,360	$	152,249

Schedule of other (income) expense, net

	Fiscal Years Ended March 31,
(amounts in thousands)	2019			2018			2017
Other (income) expense, net:
Net foreign exchange (gains) losses	$	(7,230	)	$	13,145		$	(3,758	)
Legal fines related to anti-trust class actions	6,701			9,900			—
Post retirement and pension plan non-service costs	366			210			1,256
Insurance proceeds	—			—			(423		)
Loss on early extinguishment of debt	15,946			486			—
Grant (income)	(4,559		)	(787		)	—
Other	(10		)	1,638			(946		)
Total other (income) expense, net	$	11,214		$	24,592		$	(3,871	)