Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments - Equity Method Investment Reconciliation (Details)

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Equity Method Investments - Equity Method Investment Reconciliation (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
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity [Abstract]          
Equity method investments $ 16,641   $ 16,641   $ 12,925
NT Sales Co., Ltd (NTS) [Member]          
Related Party Transactions [Abstract]          
Sales to NEC TOKIN 12,944 $ 12,805 37,524 $ 37,402  
Related Party Transaction, Purchases from Related Party $ 312 $ 495 $ 919 $ 1,266