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LEASES - Lease Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Leases [Abstract]        
Operating lease expense $ 8,377 $ 9,129 $ 25,750 $ 26,734
Finance lease expense:        
Amortization of assets 3,270 3,343 9,729 8,228
Interest on lease liabilities 555 456 1,673 1,322
Total finance lease expense 3,825 3,799 11,402 9,550
Variable and short-term lease expense 4,584 4,233 13,871 12,547
Total lease expense $ 16,786 $ 17,161 $ 51,023 $ 48,831