Annual report pursuant to Section 13 and 15(d)

Acquisitions Acquisitions - Bargain Purchase Gain (Details)

v3.19.1
Acquisitions Acquisitions - Bargain Purchase Gain (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 19, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Sep. 30, 2017
Business Acquisition [Line Items]            
Less: fair value of net assets acquired $ (416,629)          
Bargain purchase gain   $ 0 $ (130,880) $ 0    
Exchange rate 10900.70%   11182.30%   11257.40% 11250.20%
TOKIN            
Business Acquisition [Line Items]            
Bargain purchase gain $ (62,159)     $ (60,300)    
TOKIN            
Business Acquisition [Line Items]            
Net consideration transferred 150,358          
NEC TOKIN Corporation | Stock Purchase Agreement | KEMET Electronics Corporation            
Business Acquisition [Line Items]            
Preliminary fair value of KEMET’s previously held equity interest in TOKIN 204,112          
Japan, Yen | TOKIN            
Business Acquisition [Line Items]            
Amount of debt TOKIN owed NEC 25,400,000          
United States of America, Dollars | TOKIN            
Business Acquisition [Line Items]            
Amount of debt TOKIN owed NEC $ 233,200