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Investment in NEC TOKIN - Stock Purchase Agreement (Details)
$ in Thousands
3 Months Ended 8 Months Ended 9 Months Ended
Feb. 01, 2013
USD ($)
director_position
Dec. 31, 2016
USD ($)
number_of_times
Dec. 31, 2015
USD ($)
Apr. 30, 2015
number_of_times
Dec. 31, 2016
USD ($)
number_of_times
Dec. 31, 2015
USD ($)
Mar. 31, 2016
USD ($)
Mar. 12, 2012
Schedule of Equity Method Investments [Line Items]                
Change in value of NEC TOKIN option   $ 6,900 $ 700   $ (3,500) $ (26,300)    
Derivative Assets (Liabilities), at Fair Value, Net   $ (24,100)     (24,100)   $ (20,600)  
Recurring                
Schedule of Equity Method Investments [Line Items]                
Change in value of NEC TOKIN option         $ (3,500)      
Senior Notes [Member]                
Schedule of Equity Method Investments [Line Items]                
Rate   10.50%     10.50%      
NEC TOKIN Corporation [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity Method Investment, Ownership Percentage   34.00% 34.00%   34.00% 34.00%    
NEC TOKIN Corporation [Member] | Stockholders Agreement [Member]                
Schedule of Equity Method Investments [Line Items]                
Number of Director Positions | director_position 7              
NEC TOKIN Corporation [Member] | Put Option [Member]                
Schedule of Equity Method Investments [Line Items]                
Derivative Assets (Liabilities), at Fair Value, Net   $ (24,100)     $ (24,100)   $ (20,600)  
NEC TOKIN Corporation [Member] | Put Option [Member] | Recurring | Level 3                
Schedule of Equity Method Investments [Line Items]                
Change in value of NEC TOKIN option   6,900            
NEC TOKIN Corporation [Member] | KEMET Electronics Corporation [Member]                
Schedule of Equity Method Investments [Line Items]                
Equity Method Investment, Aggregate Cost $ 54,500              
Business Acquisition, Transaction Costs 4,500              
NEC TOKIN Corporation [Member] | KEMET Electronics Corporation [Member] | Stock Purchase Agreement [Member]                
Schedule of Equity Method Investments [Line Items]                
Business Acquisition, Percentage of Voting Interests Acquired               51.00%
Equity Method Investment, Ownership Percentage               34.00%
Payments to Acquire Businesses, Gross 50,000              
Payments to Acquire Equity Method Investments $ 50,000              
NEC TOKIN Corporation [Member] | KEMET Electronics Corporation [Member] | Stockholders Agreement [Member]                
Schedule of Equity Method Investments [Line Items]                
Number of Director Positions | director_position 4              
NEC TOKIN Corporation [Member] | KEMET Electronics Corporation [Member] | Option Agreement [Member]                
Schedule of Equity Method Investments [Line Items]                
Business Acquisition Potential Future Purchase Price   $ 50,000     $ 50,000      
Economic Ownership, Percentage of Ownership After Transaction       49.00%        
Sale of Stock, Percentage of Ownership after Transaction       51.00%        
Business Acquisition Contingent Consideration Multiple Applied to LTMEBITDA to Determine Purchase Price | number_of_times       6        
NEC TOKIN Corporation [Member] | KEMET Electronics Corporation [Member] | Put Option [Member]                
Schedule of Equity Method Investments [Line Items]                
Business Acquisition Contingent Consideration Multiple Applied to LTMEBITDA to Determine Purchase Price | number_of_times   6     6