Annual report pursuant to Section 13 and 15(d)

Equity Method Investments - TOKIN's Joint Ventures (Details)

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Equity Method Investments - TOKIN's Joint Ventures (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 16,593 $ 12,925
Nippon Yttrium Co., Ltd (NYC)    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 30.00%  
Equity method investments $ 8,617 8,215
NT Sales Co., Ltd (NTS)    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 33.00%  
Equity method investments $ 1,509 $ 1,218
TOKIN | NT Sales Co., Ltd (NTS) | Disposed of by Sale    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 67.00%