Annual report pursuant to Section 13 and 15(d)

Equity Method Investments - Reconciliation of Net Loss to Equity Investment Income (Loss) (Details)

v3.19.1
Equity Method Investments - Reconciliation of Net Loss to Equity Investment Income (Loss) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 19, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Adjustments:          
Equity income from TOKIN $ 76,192 $ (3,304) $ 76,192 $ 41,643  
NEC TOKIN Corporation          
Schedule of Equity Method Investments [Line Items]          
Net income 247,786     128,502  
Equity income from TOKIN before Adjustments 84,247     43,691  
Adjustments:          
Amortization and depreciation (113)     (2,210)  
Removal of EMD memo accounts (8,981)     0  
Inventory profit elimination 24     162  
Equity income from TOKIN $ 75,177     $ 41,643  
NEC TOKIN Corporation | KEMET Electronics Corporation | Stock Purchase Agreement          
Schedule of Equity Method Investments [Line Items]          
KEMET’s equity ownership % 34.00%   34.00% 34.00% 34.00%
Acquired Equity Method Investment          
Adjustments:          
Equity income from TOKIN $ 1,015     $ 0