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Subsequent Events - Tokin (Details)
¥ in Millions, $ in Millions
Apr. 14, 2017
JPY (¥)
Feb. 23, 2017
USD ($)
Feb. 23, 2017
JPY (¥)
Apr. 19, 2017
Apr. 14, 2017
USD ($)
Rate
Apr. 14, 2017
JPY (¥)
Rate
Apr. 09, 2017
Rate
Mar. 31, 2017
Rate
Subsequent Event [Line Items]                
Exchange rate               11182.00%
Subsequent Event                
Subsequent Event [Line Items]                
Exchange rate         10887.40% 10887.40% 10875.10%  
NEC TOKIN | Subsequent Event                
Subsequent Event [Line Items]                
Purchase price         $ 442.7 ¥ 49,600    
Proceeds | ¥ ¥ 99              
NEC TOKIN | KEC                
Subsequent Event [Line Items]                
Consideration transferred   $ 148.8 ¥ 16,200          
Purchase price paid   $ 55.2 ¥ 6,000          
NEC TOKIN | KEC | Subsequent Event                
Subsequent Event [Line Items]                
Interest acquired       66.00%