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Subsequent Events - Schedule of gain on sale of business (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2017
JPY (¥)
Mar. 31, 2017
USD ($)
Rate
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Jun. 30, 2017
JPY (¥)
Subsequent Event [Line Items]            
Gain on sale | $     $ 0 $ 0 $ 5,644  
Exchange rate | Rate     11182.00%      
Scenario, Forecast            
Subsequent Event [Line Items]            
Gain on sale $ 81,804 ¥ 133.6        
KEMET’s equity ownership % 34.00%         34.00%
Scenario, Forecast | NEC TOKIN            
Subsequent Event [Line Items]            
Sales price $ 443,355         ¥ 495.8
Carrying amount of EMD net assets 68,971         77.1
Remove AOCI 4,619         5.2
Transaction related fees and taxes 6,099         6.8
Deferred tax asset 123,144         ¥ 13.8
Gain on sale $ 240,600 ¥ 392.9