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Organization and Significant Accounting Policies (Tables)
 12 Months Ended
Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of components of accumulated other comprehensive income (loss)
The following summary sets forth the components of accumulated other comprehensive income (loss) contained in the stockholders’ equity section of the Consolidated Balance Sheets (amounts in thousands):
 
 
Foreign
Currency
Translation
Gains (Losses)
 
Defined Benefit
Post-retirement
Plan
Adjustments
 
Defined
Benefit
Pension
Plans (3)
 
Ownership Share of Equity Method Investees’ Other Comprehensive Income (Loss)
 
Foreign Exchange Contracts
 
Net
Accumulated
Other
Comprehensive
Income (Loss)
Balance at March 31, 2015
 
$
(12,132
)
 
$
1,159

 
$
(20,363
)
 
$
1,537

 
$
1,003

 
$
(28,796
)
Other comprehensive income (loss) before reclassifications (1)
 
1,860

 
146

 
3,865

 
(8,276
)
 
2,618

 
213

Amounts reclassified in (out) of AOCI (1)
 
—

 
(191
)
 
1,337

 
—

 
(3,988
)
 
(2,842
)
Other comprehensive income (loss)
 
1,860

 
(45
)
 
5,202

 
(8,276
)
 
(1,370
)
 
(2,629
)
Balance at March 31, 2016
 
(10,272
)
 
1,114

 
(15,161
)
 
(6,739
)
 
(367
)
 
(31,425
)
Other comprehensive income (loss) before reclassifications (2)
 
(15,284
)
 
228

 
(536
)
 
1,440

 
8,444

 
(5,708
)
Amounts reclassified in (out) of AOCI (2)
 
—

 
(208
)
 
699

 
—

 
(5,170
)
 
(4,679
)
Other comprehensive income (loss)
 
(15,284
)
 
20

 
163

 
1,440

 
3,274

 
(10,387
)
Balance at March 31, 2017
 
$
(25,556
)
 
$
1,134

 
$
(14,998
)
 
$
(5,299
)
 
$
2,907

 
$
(41,812
)
_______________________________________________________________________________
(1)
Activity within foreign currency translation gains and defined benefit pension plans are net of a tax expense of zero and $0.3 million, respectively.
(2)
Activity within foreign currency translation losses and defined benefit pension plans are net of a tax benefit of zero and $0.7 million, respectively.
(3)
Balance is net of a tax benefit of $2.7 million, $2.0 million, and $2.3 million as of March 31, 2017, March 31, 2016, and March 31, 2015, respectively.
Schedule of assets measured at fair value on a recurring basis
Assets and liabilities are measured at fair value on a recurring basis as of March 31, 2017 and 2016 are as follows (amounts in thousands):
    
 
 
Carrying
Value
March 31,
2017
 
Fair
Value
March 31,
2017
 
Fair Value Measurement
Using
 
 
 
 
Level 1
 
Level 2 (2)
 
Level 3
Assets and Liabilities:
 
 
 
 
 
 
 
 
 
 
Money markets (1)
 
$
2,055

 
$
2,055

 
$
2,055

 
$
—

 
$
—

Total debt
 
(388,211
)
 
(385,251
)
 
(353,000
)
 
(32,251
)
 
—

TOKIN options, net (3)
 
(9,900
)
 
(9,900
)
 
—

 
—

 
(9,900
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Carrying
Value
March 31,
2016
 
Fair
Value
March 31,
2016
 
Fair Value Measurement
Using
 
 
 
 
Level 1
 
Level 2 (2)
 
Level 3
Assets and Liabilities:
 
 
 
 
 
 
 
 
 
 
Money markets (1)
 
$
738

 
$
738

 
$
738

 
$
—

 
$
—

Total debt
 
(387,833
)
 
(284,261
)
 
(254,713
)
 
(29,548
)
 
—

TOKIN options, net (3)
 
(20,600
)
 
(20,600
)
 
—

 
—

 
(20,600
)
_______________________________________________________________________________
(1)
Included in the line item “Cash and cash equivalents” on the Consolidated Balance Sheets.
(2)
The valuation approach used to calculate fair value was a discounted cash flow based on the borrowing rate for each respective debt facility.
(3)
See Note 5, “Investment in TOKIN,” for a description of the TOKIN options. The value of the options is interrelated and depends on the enterprise value of TOKIN Corporation and its EBITDA over the duration of the instruments. Therefore, the options have been valued using option pricing methods in a Monte Carlo simulation. Changes to the Monte Carlo simulation inputs could have a material effect on the value of the TOKIN options.
Summary of NEC TOKIN option valuation activity using significant unobservable inputs (Level 3)
The table below summarizes TOKIN options valuation activity using significant unobservable inputs (Level 3) (amounts in thousand):
March 31, 2015
$
5,700

Change in value of TOKIN options
(26,300
)
March 31, 2016
$
(20,600
)
Change in value of TOKIN options
10,700

March 31, 2017
$
(9,900
)