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Investment in NEC TOKIN - Equity Method Investment Reconciliation (Details)
$ in Thousands, ¥ in Millions, TWD in Millions, BRL in Millions
1 Months Ended 3 Months Ended
Jul. 26, 2016
USD ($)
Jul. 26, 2016
BRL
May 02, 2016
USD ($)
suit
installment
Mar. 29, 2016
USD ($)
Mar. 29, 2016
JPY (¥)
Dec. 09, 2015
USD ($)
Dec. 09, 2015
TWD
Sep. 02, 2015
USD ($)
installment
Apr. 19, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
May 05, 2010
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity [Abstract]                          
Investment in TOKIN                     $ 12,038 $ 63,416  
Indemnity asset for legal investigation                 $ 8,500        
NEC TOKIN Corporation [Member]                          
Related Party Transactions [Abstract]                          
Loss Contingency Accrual                     73,500    
Equity Method Investments [Member] | Stockholders Agreement [Member]                          
Related Party Transactions [Abstract]                          
Business Combination, Indemnification Assets, Range of Outcomes, Value, Low                     $ 25,000    
Indemnification Agreement [Member] | Equity Method Investments [Member]                          
Related Party Transactions [Abstract]                          
Litigation Settlement, Amount               $ (13,800)          
Indemnification Agreement [Member] | Equity Method Investments [Member] | NEC TOKIN Corporation [Member]                          
Related Party Transactions [Abstract]                          
Litigation Settlement, Amount     $ (37,300)                    
Litigation Settlement, Number of Payment Installments | installment     5                    
Litigation Settlement, Number of Annual Payment Installments | installment     3                    
Settled Litigation [Member] | Indemnification Agreement [Member] | Equity Method Investments [Member]                          
Related Party Transactions [Abstract]                          
Litigation Settlement, Amount               $ (2,300)          
Litigation Settlement, Payment Period               5 years          
Litigation Settlement, Number of Payment Installments | installment               6          
Preliminary Settlement [Member] | Indemnification Agreement [Member] | Equity Method Investments [Member] | NEC TOKIN Corporation [Member]                          
Related Party Transactions [Abstract]                          
Loss Contingency, Pending Claims, Number | suit     2                    
TAIWAN, PROVINCE OF CHINA | Taiwan, New Dollars                          
Related Party Transactions [Abstract]                          
Loss Contingency, Damages Sought, Value | TWD             TWD 1,218.2            
TAIWAN, PROVINCE OF CHINA | Taiwan, New Dollars | Minimum [Member]                          
Related Party Transactions [Abstract]                          
Loss Contingency, Damages Sought, Value | TWD             TWD 609.1            
TAIWAN, PROVINCE OF CHINA | United States of America, Dollars                          
Related Party Transactions [Abstract]                          
Loss Contingency, Damages Sought, Value           $ 40,000              
TAIWAN, PROVINCE OF CHINA | United States of America, Dollars | Minimum [Member]                          
Related Party Transactions [Abstract]                          
Loss Contingency, Damages Sought, Value           $ 20,000              
JAPAN | United States of America, Dollars                          
Related Party Transactions [Abstract]                          
Litigation Settlement, Amount       $ (1,100)                  
JAPAN | Japan, Yen                          
Related Party Transactions [Abstract]                          
Litigation Settlement, Amount | ¥         ¥ (127.2)                
BRAZIL | Settled Litigation [Member]                          
Related Party Transactions [Abstract]                          
Loss Contingency, Damages Paid, Value $ 200 BRL 0.6                      
NEC TOKIN Corporation [Member]                          
Related Party Transactions [Abstract]                          
Sales to NEC TOKIN                 727 $ 3,147      
NEC TOKIN's sales to KEMET                 $ 356 $ 1,872      
KEC’s economic interest %                     34.00%    
Senior Notes [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Rate                         10.50%