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Revolving Credit Facilities and Mortgage Payable - China Line of Credit (Details)
2 Months Ended 12 Months Ended
May 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
May 25, 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]              
Debt instrument covenant percentage of facility amount in United States dollars guaranteed   108.50%          
Revolving Credit Facility | Line of Credit | Second Amended China Credit Facility              
Debt Instrument [Line Items]              
Interest rate multiplier for variable rate   115.00%          
Interest rate, effective percentage   5.00%          
Proceeds from lines of credit   $ 21,026,000          
Repayments of lines of credit   21,026,000          
Long-term line of credit   0          
Amount available under the credit agreement   $ 47,760,000          
Subsequent Event | Line of Credit | Second Amended China Credit Facility              
Debt Instrument [Line Items]              
Amount available under the credit agreement     $ 47,760,000        
Subsequent Event | Line of Credit | Second Amended China Credit Facility, Overdraft Sublimit              
Debt Instrument [Line Items]              
Long-term line of credit     $ 0        
Subsequent Event | Revolving Credit Facility | Line of Credit | Second Amended China Credit Facility              
Debt Instrument [Line Items]              
Proceeds from lines of credit $ 0            
Line of Credit | Revolving Credit Facility | Second Amended China Credit Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity           $ 47,760,000 ¥ 300,000,000
Capacity available for specific purpose other than for trade purchases           $ 7,960,000 ¥ 50,000,000
Line of Credit | Revolving Credit Facility | Second Amended China Credit Facility, Overdraft Sublimit              
Debt Instrument [Line Items]              
Overdraft facility sublimit       $ 15,920,000 ¥ 100,000,000    
People's Bank Of China | Revolving Credit Facility | Line of Credit | 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