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Revolving Credit Facilities and Mortgage Payable - Japan Line of Credit (Details) - Japan Credit Facility
12 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
JPY (¥)
May 30, 2017
USD ($)
Mar. 31, 2016
USD ($)
Notes Payable and Long-Term Debt        
Covenant compliance, period of not having losses 2 years      
Maximum        
Notes Payable and Long-Term Debt        
Current borrowing capacity   ¥ 5,500,000,000   $ 49,000,000
Debt instrument term   6 months    
Tokyo Interbank Offered Rate (TIBOR)        
Notes Payable and Long-Term Debt        
Spread on variable interest rate (as a percent)   0.40%    
Tokyo Interbank Offered Rate (TIBOR) 0.06%      
Interest rate, effective percentage 0.46%      
Revolving Credit Facility | Line of Credit        
Notes Payable and Long-Term Debt        
Current borrowing capacity $ 0      
Long-term line of credit 38,000,000      
Repayments of lines of credit 35,000,000      
Amount available under the credit agreement $ 49,000,000      
Subsequent Event | Line of Credit        
Notes Payable and Long-Term Debt        
Long-term line of credit     $ 0  
Amount available under the credit agreement     49,000,000  
Subsequent Event | Revolving Credit Facility | Line of Credit        
Notes Payable and Long-Term Debt        
Long-term line of credit     $ 0