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LEASES - Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Lease, Cost [Abstract]    
Operating lease cost $ 4,228 $ 4,816
Short-term lease expense 407 226
Variable lease cost 8 40
Amortization of finance lease assets 0 18
Interest on finance lease liabilities 2 4
Total lease cost $ 4,645 $ 5,104