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Debt Term Loan Facility (JPY) (Details)
$ in Thousands, ¥ in Billions
3 Months Ended
Dec. 31, 2018
Nov. 08, 2018
USD ($)
Nov. 08, 2018
JPY (¥)
Jun. 30, 2019
USD ($)
Jun. 30, 2019
JPY (¥)
Jun. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Nov. 07, 2018
USD ($)
Nov. 07, 2018
JPY (¥)
Debt Instrument [Line Items]                  
Long-term Debt       $ 312,096     $ 294,471    
Proceeds from Issuance of Secured Debt       12,541   $ 0      
Term Loan Credit Agreement                  
Debt Instrument [Line Items]                  
Long-term Debt               $ 323,400  
Debt, Prepayment Premium, Percent               1.00% 1.00%
Payment for Debt Extinguishment or Debt Prepayment Cost   $ 3,200              
Term Loan Facility                  
Debt Instrument [Line Items]                  
Long-term Debt       284,623     $ 276,808   ¥ 33.0
Proceeds from Issuance of Secured Debt   283,900 ¥ 32.1            
Proceeds from Debt, Net of Issuance Costs   $ 281,800              
Interest Payable, Current       1,700          
Term Loan A Tranche | Term Loan Facility                  
Debt Instrument [Line Items]                  
Long-term Debt               $ 146,000 ¥ 16.5
Debt Instrument, Periodic Payment, Principal       $ 12,800 ¥ 1.4        
Debt Instrument, Interest Rate, Stated Percentage               2.00% 2.00%
Term Loan B Tranche | Term Loan Facility                  
Debt Instrument [Line Items]                  
Long-term Debt               $ 146,000 ¥ 16.5
Debt Instrument, Interest Rate, Stated Percentage               2.25% 2.25%
TIBOR | Term Loan B Tranche | Term Loan Facility                  
Debt Instrument [Line Items]                  
Basis spread on variable rate 0.13%