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Revolving Credit Facilities and Mortgage Payable - China Line of Credit (Details)
1 Months Ended 6 Months Ended
Nov. 02, 2018
USD ($)
Aug. 31, 2013
USD ($)
Sep. 30, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CNY (¥)
Aug. 31, 2013
CNY (¥)
China Credit Agreement            
Debt Instrument [Line Items]            
Guarantor obligation   108.50%        
Line of Credit | Subsequent Event | Second Amended China Credit Facility            
Debt Instrument [Line Items]            
Amount available under the credit agreement $ 24,786,000          
Line of Credit | Subsequent Event | Second Amended China Credit Facility, Overdraft Sublimit            
Debt Instrument [Line Items]            
Long-term line of credit 18,881,000          
Line of Credit | Revolving Credit Facility | Second Amended China Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 43,667,000       ¥ 300,000,000
Line of credit facility sublimit   $ 7,278,000       ¥ 50,000,000
Interest rate, effective percentage     4.57%      
Proceeds from lines of credit     $ 18,881,000      
Repayments of lines of credit     0      
Long-term line of credit     18,881,000      
Amount available under the credit agreement     $ 24,786,000      
Line of Credit | Revolving Credit Facility | Second Amended China Credit Facility, Overdraft Sublimit            
Debt Instrument [Line Items]            
Line of credit facility overdraft facility sublimit       $ 14,556,000 ¥ 100,000,000  
Line of Credit | Revolving Credit Facility | Subsequent Event | Second Amended China Credit Facility            
Debt Instrument [Line Items]            
Proceeds from lines of credit 0          
Repayments of lines of credit $ 0          
People's Bank Of China | Line of Credit | Revolving Credit Facility | Second Amended China Credit Facility            
Debt Instrument [Line Items]            
Interest rate multiplier for variable rate     4.35%      
Maximum | Second Amended China Credit Facility            
Debt Instrument [Line Items]            
Debt instrument term   12 months