Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets Schedule of Goodwill (Details)

v3.20.1
Goodwill and Intangible Assets Schedule of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Goodwill [Line Items]      
Goodwill $ 41,210 $ 40,294 $ 40,294
Goodwill, Acquired During Period 916 0  
Solid Capacitors      
Goodwill [Line Items]      
Goodwill 35,584 35,584 35,584
Goodwill, Acquired During Period 0 0  
Film and Electrolytic      
Goodwill [Line Items]      
Goodwill 916 0 0
Goodwill, Acquired During Period 916 0  
Electro-magnetic, Sensors & Actuators [Member]      
Goodwill [Line Items]      
Goodwill 0 0 0
Goodwill, Acquired During Period 0 0  
Corporate      
Goodwill [Line Items]      
Goodwill 4,710 4,710 $ 4,710
Goodwill, Acquired During Period 0 $ 0  
Novasentis | Film and Electrolytic      
Goodwill [Line Items]      
Goodwill $ 900