Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments Narrative (Details)

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Equity Method Investments Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 16,641   $ 16,641   $ 12,925
Novasentis [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 0   $ 0   977
Nippon Yttrium Co., Ltd (NYC) [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investment, Ownership Percentage 30.00%   30.00%    
Equity method investments $ 8,384   $ 8,384   8,215
NT Sales Co., Ltd (NTS) [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investment, Ownership Percentage 33.00%   33.00%    
Equity method investments $ 1,426   $ 1,426   1,218
KEMET Jianghai [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investment, Ownership Percentage 50.00%   50.00%    
Equity method investments $ 6,831   $ 6,831   $ 2,515
NT Sales Co., Ltd (NTS) [Member] | TOKIN [Member] | Discontinued Operations, Disposed of by Sale [Member]          
Schedule of Equity Method Investments [Line Items]          
Equity Method Investment, Ownership Percentage 67.00%   67.00%    
KEMET Jianghai [Member]          
Schedule of Equity Method Investments [Line Items]          
Related Party Transaction, Purchases from Related Party $ 1,028 $ 0 $ 1,599 $ 0  
NT Sales Co., Ltd (NTS) [Member]          
Schedule of Equity Method Investments [Line Items]          
Related Party Transaction, Purchases from Related Party $ 312 $ 495 $ 919 $ 1,266