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Debt Debt - TOKIN Term Loan Facility (Details)
$ in Thousands, ¥ in Millions
12 Months Ended
Nov. 07, 2018
USD ($)
Nov. 07, 2018
JPY (¥)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
JPY (¥)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Nov. 07, 2018
JPY (¥)
Debt Instrument [Line Items]              
Payment for Debt Extinguishment or Debt Prepayment Cost     $ 0   $ 3,234 $ 0  
Interest     47   211    
Term Loan Facility              
Debt Instrument [Line Items]              
Long-term Debt     $ 258,678   $ 276,808    
Debt Instrument, Interest Rate, Effective Percentage     3.00%        
Term Loan Credit Agreement              
Debt Instrument [Line Items]              
Long-term Debt $ 323,400            
Debt, Prepayment Premium, Percent 1.00%           1.00%
Term Loan A Tranche | Term Loan Facility              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage 2.00%           2.00%
Term Loan B Tranche | Term Loan Facility              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage 2.25%           2.25%
Term Loan B Tranche | Term Loan Facility | TIBOR              
Debt Instrument [Line Items]              
Debt Instrument, Basis Spread on Variable Rate     0.13% 0.13%      
United States of America, Dollars | Term Loan Facility              
Debt Instrument [Line Items]              
Proceeds from Issuance of Secured Debt $ 283,900            
Net proceeds 281,800            
United States of America, Dollars | Term Loan A Tranche | Term Loan Facility              
Debt Instrument [Line Items]              
Long-term Debt 146,000            
Debt Instrument, Periodic Payment, Principal | ¥       ¥ 12.7      
United States of America, Dollars | Term Loan B Tranche | Term Loan Facility              
Debt Instrument [Line Items]              
Long-term Debt $ 146,000            
Japan, Yen | Term Loan Facility              
Debt Instrument [Line Items]              
Long-term Debt | ¥             ¥ 33,000.0
Proceeds from Issuance of Secured Debt | ¥   ¥ 32,100.0          
Japan, Yen | Term Loan A Tranche | Term Loan Facility              
Debt Instrument [Line Items]              
Long-term Debt | ¥             16,500.0
Debt Instrument, Periodic Payment, Principal | ¥       ¥ 1,400.0      
Japan, Yen | Term Loan B Tranche | Term Loan Facility              
Debt Instrument [Line Items]              
Long-term Debt | ¥             ¥ 16,500.0
Property, Plant and Equipment | Term Loan Facility              
Debt Instrument [Line Items]              
Debt Instrument, Collateral Amount     $ 51,400