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Debt - Revolving Line of Credit Narrative (Details) - USD ($)
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2016
Dec. 19, 2014
Sep. 30, 2010
May 05, 2010
Debt Instrument [Line Items]              
Line of Credit Facility, Fair Value of Amount Outstanding $ 33,881,000 $ 33,881,000          
Proceeds from revolving line of credit 12,000,000 10,000,000 $ 42,340,000        
Repayments of line of credit $ 12,000,000 9,600,000 27,342,000        
Guarantor Subsidiaries [Member]              
Debt Instrument [Line Items]              
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions 100.00%            
Proceeds from revolving line of credit $ 12,000,000 8,000,000 37,340,000        
Repayments of line of credit 0 9,600,000 $ 22,342,000        
US Facility [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Fair Value of Amount Outstanding 31,881,000 19,881,000          
Proceeds from revolving line of credit 12,000,000            
Repayments of line of credit $ 0            
Foreign Line of Credit [Member]              
Debt Instrument [Line Items]              
Maximum borrowing capacity         $ 30,000,000.0    
Foreign Line of Credit [Member] | LIBOR              
Debt Instrument [Line Items]              
Stated interest rate (as a percent) 0.00%            
Foreign Line of Credit [Member] | Minimum | LIBOR              
Debt Instrument [Line Items]              
Spread on variable rate basis (as a percent) 2.25%            
Foreign Line of Credit [Member] | Minimum | Base Rate              
Debt Instrument [Line Items]              
Spread on variable rate basis (as a percent) 1.25%            
Foreign Line of Credit [Member] | Maximum | LIBOR              
Debt Instrument [Line Items]              
Spread on variable rate basis (as a percent) 2.75%            
Foreign Line of Credit [Member] | Maximum | Base Rate              
Debt Instrument [Line Items]              
Spread on variable rate basis (as a percent) 1.75%            
Foreign Line of Credit [Member] | KEMET Singapore              
Debt Instrument [Line Items]              
Borrowing base component one, percentage of borrower's accounts receivable that satisfy certain eligibility criteria         85.00%    
Domestic Line of Credit [Member]              
Debt Instrument [Line Items]              
Cash Dominion Trigger Event, Number of days Considered 5 days            
Cash Dominion Trigger Event, Availability under credit facility $ 3,750,000            
Required aggregate revolver commitments to maintain fixed charge coverage ratio $ 3,750,000            
Domestic Line of Credit [Member] | Base Rate              
Debt Instrument [Line Items]              
Stated interest rate (as a percent) 5.00%            
Spread on variable rate basis (as a percent) 1.50%            
Domestic Line of Credit [Member] | Minimum | LIBOR              
Debt Instrument [Line Items]              
Spread on variable rate basis (as a percent) 2.00%            
Domestic Line of Credit [Member] | Minimum | Base Rate              
Debt Instrument [Line Items]              
Spread on variable rate basis (as a percent) 1.00%            
Domestic Line of Credit [Member] | Maximum | LIBOR              
Debt Instrument [Line Items]              
Spread on variable rate basis (as a percent) 2.50%            
Domestic Line of Credit [Member] | Maximum | Base Rate              
Debt Instrument [Line Items]              
Spread on variable rate basis (as a percent) 1.50%            
Domestic Line of Credit [Member] | KEC              
Debt Instrument [Line Items]              
Borrowing base component one, percentage of borrower's accounts receivable that satisfy certain eligibility criteria         85.00%    
Borrowing base component two, fixed amount for determining second component for borrowing base         $ 6,000,000    
Borrowing base component two, percentage of net book value of inventory of borrower that satisfies certain eligibility criteria         40.00%    
Borrowing base component three, percentage of net orderly liquidation percentage of the appraised value of inventory that satisfies certain eligibility criteria         85.00%    
Borrowing base component three, fixed amount for determining second component for borrowing base         $ 5,100,000    
Borrowing base component three, percentage of net orderly liquidation percentage of the appraised value of equipment that satisfies certain eligibility criteria         80.00%    
Letter of Credit One [Member]              
Debt Instrument [Line Items]              
Credit facility, remaining borrowing capacity $ 29,200,000            
Line of Credit Facility, Fair Value of Amount Outstanding $ 33,881,000 33,881,000          
10.5% Senior Notes              
Debt Instrument [Line Items]              
Stated interest rate (as a percent) 10.50%     10.50%     10.50%
Debt issuance cost, net of amortization $ 1,400,000 2,800,000          
Revolving Line of Credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity         $ 75,000,000 $ 50,000,000.0  
Line of Credit Facility, Current Borrowing Capacity         60,000,000    
Credit facility, remaining borrowing capacity         $ 15,000,000    
Cash Dominion Trigger Event, Number of days Considered 5 days            
Cash Dominion Trigger Event, Availability under credit facility (as a percent) 12.50%            
Cash Dominion Trigger Event, Availability under credit facility $ 7,500,000            
Fixed charge coverage ratio 1.0            
Consecutive period of non occurrence of any condition to maintain fixed charge coverage ratio 45 days            
Required aggregate revolver commitments to maintain fixed charge coverage ratio (as a percent) 12.50%            
Required aggregate revolver commitments to maintain fixed charge coverage ratio $ 7,500,000            
Debt issuance cost, net of amortization $ 200,000 200,000          
Revolving Line of Credit | Greater than 33.3% and less than 66.6%              
Debt Instrument [Line Items]              
Unused line fee (as a percent) 0.50%            
Revolving Line of Credit | Greater than or equal to 66.6%              
Debt Instrument [Line Items]              
Unused line fee (as a percent) 0.375%            
Revolving Line of Credit | LIBOR              
Debt Instrument [Line Items]              
Spread on variable rate basis (as a percent) 1.00%            
Revolving Line of Credit | Maximum | Greater than 33.3% and less than 66.6%              
Debt Instrument [Line Items]              
Average daily balance as percentage of total revolving commitment 50.00%            
Revolving Line of Credit | Maximum | Greater than or equal to 66.6%              
Debt Instrument [Line Items]              
Average daily balance as percentage of total revolving commitment 50.00%            
Revolving Line of Credit | KEMET Singapore              
Debt Instrument [Line Items]              
Percentage of assets pledged as collateral 100.00%            
90 Day Borrowing Term [Member] | Singapore Facility [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Fair Value of Amount Outstanding $ 0            
Proceeds from revolving line of credit 0            
Repayments of line of credit 12,000,000            
30 Day Borrowing Term [Member] | Singapore Facility [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Fair Value of Amount Outstanding $ 2,000,000            
30 Day Borrowing Term [Member] | Singapore Facility [Member] | LIBOR              
Debt Instrument [Line Items]              
Stated interest rate (as a percent) 3.375%            
Spread on variable rate basis (as a percent) 2.50%            
Letter of Credit One [Member] | Singapore Facility [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Fair Value of Amount Outstanding   12,000,000          
Letter of Credit Two [Member] | Singapore Facility [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Fair Value of Amount Outstanding   $ 2,000,000