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Investment in NEC TOKIN - Stock Purchase Agreement (Details)
$ in Thousands
3 Months Ended 6 Months Ended 8 Months Ended
Feb. 01, 2013
USD ($)
director_position
Sep. 30, 2016
USD ($)
number_of_times
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
number_of_times
Sep. 30, 2015
USD ($)
Apr. 30, 2015
number_of_times
Mar. 31, 2016
USD ($)
Mar. 12, 2012
Schedule of Equity Method Investments [Line Items]                
Change in value of NEC TOKIN option   $ 1,600 $ 2,200 $ (10,400) $ (27,000)      
Derivative Assets (Liabilities), at Fair Value, Net   $ (31,000)   (31,000)     $ (20,600)  
Recurring                
Schedule of Equity Method Investments [Line Items]                
Change in value of NEC TOKIN option       $ 10,400        
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   $ (31,000)   $ (31,000)     $ (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   1,600   (10,400)        
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