Supplemental Balance Sheets and Statements of Operations Detail (Tables)

12 Months Ended

Mar. 31, 2017

Disclosure Text Block Supplement [Abstract]

Schedule of accounts receivable

	March 31,
(amounts in thousands)	2017			2016
Accounts receivable:
Trade	$	112,940		$	116,146
Allowance for doubtful accounts reserve	(942		)	(1,002		)
Ship-from-stock and debit reserve	(15,489		)	(17,362		)
Returns reserves	(2,913		)	(3,324		)
Rebates reserves	(564		)	(872		)
Price protection reserves	(506		)	(418		)
Accounts receivable, net	$	92,526		$	93,168

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, 2014	$	24,660
Cost charged to expense	91,091
Actual adjustments applied	(90,909		)
Other	(195		)
Balance at March 31, 2015	24,647
Cost charged to expense	95,212
Actual adjustments applied	(96,932		)
Other	51
Balance at March 31, 2016	22,978
Cost charged to expense	87,317
Actual adjustments applied	(89,762		)
Other	(119		)
Balance at March 31, 2017	$	20,414

Schedule of components of inventories

	March 31,
(amounts in thousands)	2017			2016
Inventories:
Raw materials and supplies	$	65,750		$	80,289
Work in process	47,408			46,631
Finished goods	50,738			58,060
Inventory gross	163,896			184,980
Inventory reserves	(15,941		)	(16,101		)
Inventory, net	$	147,955		$	168,879

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, 2014	$	26,826
Costs charged to expense	9,291
Write-offs	(17,520		)
Other	(1,098		)
Balance at March 31, 2015	17,499
Costs charged to expense	5,696
Write-offs	(7,326		)
Other	232
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

Schedule of Property, plant and equipment

	Useful life (years)	March 31,
(amounts in thousands, except years)		2017			2016
Property, plant and equipment:
Land and land improvements	20	$	21,642		$	22,380
Buildings	20 - 40	140,895			148,805
Machinery and equipment	10	783,288			793,250
Furniture and fixtures	4 - 10	68,706			69,442
Construction in progress		14,653			21,197
Other		1,403			2,103
Total property and equipment		1,030,587			1,057,177
Accumulated depreciation		(821,276		)	(815,338		)
Property, plant and equipment, net		$	209,311		$	241,839

Schedule of accrued expenses

	March 31,
(amounts in thousands)	2017		2016
Accrued expenses:
Salaries, wages, and related employee costs	$	29,589	$	20,708
Interest	15,603		15,683
Restructuring	984		946
Vacation	7,524		7,892
Other	4,052		5,091
Total accrued expenses	$	57,752	$	50,320

Schedule of other non-current obligations

	March 31,
(amounts in thousands)	2017		2016
Other non-current obligations:
Pension plans	$	34,674	$	35,156
Employee separation liability	8,685		9,352
Deferred compensation	1,774		1,544
Long-term obligation on land purchase	898		1,349
Restructuring	15		30
TOKIN option valuation	9,900		20,600
Long-term service contracts	339		2,343
Other	3,846		4,518
Total other non-current obligations	$	60,131	$	74,892

Schedule of other (income) expense, net

	Fiscal Years Ended March 31,
(amounts in thousands)	2017			2016			2015
Non-operating (income) expense, net:
Net foreign exchange (gains) losses	$	(3,758	)	$	(3,036	)	$	(4,249	)
Insurance proceeds	(423		)	—			—
Gain on early extinguishment of debt	—			—			(1,003		)
Offering memorandum fees	—			—			1,142
Other	(946		)	688			28
Total non-operating (income) expense, net	$	(5,127	)	$	(2,348	)	$	(4,082	)