Annual report pursuant to Section 13 and 15(d)

Equity Method Investments Equity Method Investments - TOKIN and NTS (Details)

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Equity Method Investments Equity Method Investments - TOKIN and NTS (Details) - NT Sales Co., Ltd (NTS) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]      
KEMET's sales to NTS $ 49,841 $ 49,740 $ 52,883
NTS' sales to KEMET $ 1,112 $ 2,501 $ 1,616