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Investment in NEC TOKIN - Equity Method Investment Reconciliation (Details)
$ in Thousands, ¥ in Millions, TWD in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jul. 26, 2016
USD ($)
May 02, 2016
USD ($)
suit
installment
Mar. 29, 2016
USD ($)
Mar. 29, 2016
JPY (¥)
Dec. 09, 2015
USD ($)
Dec. 09, 2015
TWD
Sep. 02, 2015
USD ($)
installment
Apr. 19, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
May 05, 2010
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity [Abstract]                          
Investment in TOKIN                     $ 8,750 $ 63,416  
Indemnity asset for legal investigation               $ 8,500          
NEC TOKIN Corporation [Member]                          
Related Party Transactions [Abstract]                          
Loss Contingency Accrual                     84,300    
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   2                      
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         $ 40,800                
TAIWAN, PROVINCE OF CHINA | United States of America, Dollars | Minimum [Member]                          
Related Party Transactions [Abstract]                          
Loss Contingency, Damages Sought, Value         $ 20,400                
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 | United States of America, Dollars | Settled Litigation [Member]                          
Related Party Transactions [Abstract]                          
Loss Contingency, Damages Paid, Value $ 200                        
NEC TOKIN Corporation [Member]                          
Related Party Transactions [Abstract]                          
Sales to NEC TOKIN               727 $ 4,814 $ 13,096      
NEC TOKIN's sales to KEMET               $ 356 $ 2,350 $ 6,112      
KEC’s economic interest %                 34.00% 34.00% 34.00%    
Senior Notes [Member]                          
Schedule of Equity Method Investments [Line Items]                          
Rate                         10.50%