Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments Narrative (Details)

v3.19.2
Equity Method Investments Narrative (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 14,238 $ 12,925
Novasentis [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 27.90%  
Equity method investments $ 671 977
Nippon Yttrium Co., Ltd (NYC) [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 30.00%  
Equity method investments $ 7,884 8,215
NT Sales Co., Ltd (NTS) [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 33.00%  
Equity method investments $ 1,258 1,218
KEMET Jianghai [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00%  
Equity method investments $ 4,425 $ 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%