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Debt - Mitsubishi Bank Loans (Details) - Mitsubishi Bank
$ in Millions
1 Months Ended
Feb. 25, 2015
JPY (¥)
Feb. 25, 2015
USD ($)
Jan. 31, 2018
JPY (¥)
Jan. 31, 2018
USD ($)
Mar. 31, 2017
JPY (¥)
Mar. 31, 2021
JPY (¥)
Mar. 31, 2021
USD ($)
Sep. 30, 2017
JPY (¥)
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Feb. 25, 2015
USD ($)
Mitsubishi Bank Term Loan A                      
Debt Instrument [Line Items]                      
Repayments of lines of credit     ¥ 500,000,000.0 $ 4.4              
Notes payable to banks | Mitsubishi Bank loans                      
Debt Instrument [Line Items]                      
Debt issuance costs ¥ 40,500,000                   $ 0.4
Notes payable to banks | Mitsubishi Bank loans | Tokyo interbank offer rate                      
Debt Instrument [Line Items]                      
Interest rate spread 1.40% 1.40%                  
Notes payable to banks | Mitsubishi Bank Term Loan A                      
Debt Instrument [Line Items]                      
Debt, aggregate principal amount ¥ 500,000,000.0                   4.4
Notes payable to banks | Mitsubishi Bank Term Loan B                      
Debt Instrument [Line Items]                      
Debt, aggregate principal amount 1,000,000,000                   $ 9.0
Debt, periodic principal payments 8,300,000 $ 0.1                  
Debt, lump sum payment on the maturity date ¥ 8,400,000 $ 0.1                  
Notes payable to banks | Mitsubishi Bank Term Loan B | Tokyo interbank offer rate                      
Debt Instrument [Line Items]                      
Interest rate spread 1.40% 1.40%                  
Notes payable to banks | 2017 Mitsubishi Bank Loan                      
Debt Instrument [Line Items]                      
Debt, aggregate principal amount               ¥ 690,000,000.0 $ 6.2    
Long-term debt           ¥ 345,000,000.0 $ 3.1        
Debt instrument, term         72 months            
Line of credit facility, outstanding         ¥ 690,000,000.0         $ 6.2  
Notes payable to banks | 2017 Mitsubishi Bank Loan | Tokyo interbank offer rate                      
Debt Instrument [Line Items]                      
Interest rate spread         1.00%            
Notes payable to banks | 2015 Mitsubishi Bank Loan                      
Debt Instrument [Line Items]                      
Long-term debt           ¥ 391,700,000 $ 3.5