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Debt Debt (Phantom) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2010
May. 05, 2010
Debt Instrument [Line Items]        
Debt Instrument, Unamortized Discount, Current $ 0 $ 278    
Document Period End Date Mar. 31, 2016      
Debt Instrument, Unamortized Discount (Premium), Net $ 1,716 2,461    
Interest payable $ 15,683 15,678    
Revolving Line of Credit | LIBOR        
Debt Instrument [Line Items]        
Spread on variable rate basis (as a percent) 1.00%      
Senior Notes [Member]        
Debt Instrument [Line Items]        
Stated interest rate (as a percent) 10.50%     10.50%
Interest payable $ 15,500      
Advanced payment from OEM        
Debt Instrument [Line Items]        
Debt Instrument, Unamortized Discount $ 0 $ 45    
KEMET Electronics Corporation [Member] | Domestic Line of Credit [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Borrowing Base Calculation, Orderly Liquidation, Reduction Percentage     0.05%