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Assets Held for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
May 31, 2020
Aug. 31, 2020
Aug. 31, 2019
Assets held for sale      
Assets held for sale     $ 1,064
Gain on sale of property   $ 2,551  
Pawtucket, RI manufacturing facility      
Assets held for sale      
Assets held for sale     1,050
Gain on sale of property $ 760 760  
Randolph, MA - Property      
Assets held for sale      
Assets held for sale     $ 14
Gain on sale of property   $ 1,791