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Revolving Credit Facilities and Mortgage Payable - China Line of Credit (Details)
1 Months Ended 9 Months Ended
Feb. 01, 2019
USD ($)
Aug. 31, 2013
Dec. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CNY (¥)
Oct. 31, 2016
USD ($)
Oct. 31, 2016
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 $ 43,613,000            
Line of Credit | Subsequent Event | Second Amended China Credit Facility, Overdraft Sublimit              
Debt Instrument [Line Items]              
Long-term line of credit 0            
Line of Credit | Revolving Credit Facility | Second Amended China Credit Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity           $ 43,613,000 ¥ 300,000,000
Line of credit facility sublimit           $ 7,269,000 ¥ 50,000,000
Interest rate, effective percentage     4.79%        
Proceeds from lines of credit     $ 18,857,000        
Repayments of lines of credit     18,857,000        
Long-term line of credit     0        
Amount available under the credit agreement     $ 43,613,000        
Line of Credit | Revolving Credit Facility | Second Amended China Credit Facility, Overdraft Sublimit              
Debt Instrument [Line Items]              
Line of credit facility overdraft facility sublimit       $ 14,538,000 ¥ 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            
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