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Debt Term Loan Facility (JPY) (Details)
$ in Thousands, ¥ in Millions
9 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
JPY (¥)
Dec. 31, 2017
USD ($)
Nov. 07, 2018
USD ($)
Nov. 07, 2018
JPY (¥)
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]              
Long-term Debt $ 305,676 $ 305,676         $ 324,623
Proceeds from Issuance of Secured Debt   293,348   $ 334,978      
Term Loan Credit Agreement              
Debt Instrument [Line Items]              
Long-term Debt 0 0     $ 323,400   318,782
Debt, Prepayment Premium, Percent         1.00% 1.00%  
Interest Payable, Current             200
Term Loan Facility              
Debt Instrument [Line Items]              
Long-term Debt 291,152 291,152         $ 0
Interest Payable, Current $ 1,000 1,000          
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%  
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  
United States of America, Dollars | Term Loan Facility              
Debt Instrument [Line Items]              
Proceeds from Issuance of Secured Debt   $ 283,900          
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 | ¥     ¥ 12.5        
United States of America, Dollars | Term Loan B Tranche | Term Loan Facility              
Debt Instrument [Line Items]              
Long-term Debt         $ 146,000    
TIBOR | Term Loan B Tranche | Term Loan Facility              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.13%