Annual report pursuant to Section 13 and 15(d)

Equity Method Investments - Reconciliation of Net Assets to Equity Investment Balance (Details)

v3.19.1
Equity Method Investments - Reconciliation of Net Assets to Equity Investment Balance (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Apr. 19, 2017
Schedule of Equity Method Investments [Line Items]      
Investment in TOKIN $ 12,925 $ 12,016  
Purchase price accounting basis adjustment:      
Indemnity asset for legal investigation     $ 8,500