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Debt Debt (Phantom)
$ in Thousands, € in Millions
12 Months Ended
Mar. 31, 2017
EUR (€)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
Mar. 31, 2016
USD ($)
Sep. 30, 2010
May 05, 2010
Debt Instrument [Line Items]            
Debt Instrument, Unamortized Discount, Current   $ 0   $ 278    
Document Period End Date Mar. 31, 2017          
Debt Instrument, Unamortized Discount (Premium), Net   0   1,716    
Interest payable   $ 15,603   15,683    
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% 10.50%     10.50%
Interest payable   $ 15,400   15,500    
Other Debt Obligations [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Unamortized Discount € 0.5 600        
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%