Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Narrative (Details)

v3.20.1
Commitments and Contingencies - Narrative (Details)
€ in Millions, $ in Millions, $ in Millions, $ in Millions, ₩ in Billions
3 Months Ended 12 Months Ended
Nov. 30, 2018
USD ($)
Nov. 30, 2018
KRW (₩)
Jun. 27, 2018
USD ($)
Jun. 27, 2018
CAD ($)
Mar. 21, 2018
EUR (€)
Mar. 21, 2018
USD ($)
Sep. 02, 2015
Dec. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
TWD ($)
Loss Contingencies [Line Items]                    
Document Period End Date                 Mar. 31, 2020 Mar. 31, 2020
Taiwan | Minimum                    
Loss Contingencies [Line Items]                    
Damages sought, value                 $ 20.2 $ 609.1
U.S. Class Action Complaint [Member]                    
Loss Contingencies [Line Items]                    
Litigation settlement, amount               $ 62.0    
TOKIN                    
Loss Contingencies [Line Items]                    
Loss contingency accrual                 77.4  
TOKIN | Settled Litigation | UNITED STATES                    
Loss Contingencies [Line Items]                    
Litigation settlement, amount                 $ 13.8  
Payment period             5 years      
Fine, number of payments                 6 6
Litigation Settlement, Amount Awarded to Other Party Yearly Installment                 $ 2.3  
Fine, Number of Payments Paid                 5 5
TOKIN | Settled Litigation | CANADA                    
Loss Contingencies [Line Items]                    
Damages paid, value     $ 2.2 $ 2.9            
TOKIN | Pending Litigation [Member] | Taiwan                    
Loss Contingencies [Line Items]                    
Litigation Settlement, Amount Awarded from Other Party                 $ 8.1 $ 243.6
TOKIN | Competition Laws of the European Union                    
Loss Contingencies [Line Items]                    
Litigation settlement, amount         € 8.8 $ 10.3        
TOKIN | Monopoly and Fair Trade Laws [Member] | KOREA, REPUBLIC OF                    
Loss Contingencies [Line Items]                    
Litigation settlement, amount $ 7.2 ₩ 8.1                
NEC TOKIN Corporation | Competition Laws of the European Union                    
Loss Contingencies [Line Items]                    
Litigation settlement, amount         € 5.0 $ 5.9        
30 days from date of settlement [Member] | U.S. Class Action Complaint [Member]                    
Loss Contingencies [Line Items]                    
Litigation settlement, amount               $ 10.0