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Investment in NEC TOKIN Investment in NEC TOKIN Stock Purchase Agreement (Details)
$ in Thousands
3 Months Ended 8 Months Ended
Feb. 01, 2013
USD ($)
director_position
Jun. 30, 2016
USD ($)
number_of_times
Jun. 30, 2015
USD ($)
Apr. 30, 2015
number_of_times
Mar. 31, 2016
USD ($)
Mar. 31, 2015
Mar. 12, 2012
Schedule of Equity Method Investments [Line Items]              
Fair Value, Option, Changes in Fair Value, Gain (Loss)   $ (12,000) $ (29,200)        
NEC TOKIN Corporation [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Ownership Percentage   34.00%       34.00%  
Stockholders Agreement [Member] | NEC TOKIN Corporation [Member]              
Schedule of Equity Method Investments [Line Items]              
Number of Director Positions | director_position 7            
Put Option [Member] | NEC TOKIN Corporation [Member]              
Schedule of Equity Method Investments [Line Items]              
Derivative Assets (Liabilities), at Fair Value, Net   $ (32,600)     $ (20,600)    
KEMET Electronics Corporation [Member] | NEC TOKIN Corporation [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity Method Investment, Aggregate Cost $ 54,500            
Business Acquisition, Transaction Costs 4,500            
KEMET Electronics Corporation [Member] | Stock Purchase Agreement [Member] | NEC TOKIN Corporation [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            
KEMET Electronics Corporation [Member] | Stockholders Agreement [Member] | NEC TOKIN Corporation [Member]              
Schedule of Equity Method Investments [Line Items]              
Number of Director Positions | director_position 4            
KEMET Electronics Corporation [Member] | Option Agreement [Member] | NEC TOKIN Corporation [Member]              
Schedule of Equity Method Investments [Line Items]              
Business Acquisition Potential Future Purchase Price   $ 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      
KEMET Electronics Corporation [Member] | Put Option [Member] | NEC TOKIN Corporation [Member]              
Schedule of Equity Method Investments [Line Items]              
Business Acquisition Contingent Consideration Multiple Applied to LTMEBITDA to Determine Purchase Price | number_of_times   6          
Senior Notes [Member]              
Schedule of Equity Method Investments [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage   10.50%          
Fair Value, Measurements, Recurring [Member]              
Schedule of Equity Method Investments [Line Items]              
Fair Value, Option, Changes in Fair Value, Gain (Loss)   $ (12,000)          
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Put Option [Member] | NEC TOKIN Corporation [Member]              
Schedule of Equity Method Investments [Line Items]              
Fair Value, Option, Changes in Fair Value, Gain (Loss)   $ (12,000)