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LEASES - Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2020
Lease, Cost [Abstract]    
Operating lease cost $ 2,837 $ 12,469
Short-term lease expense 1,802 2,254
Variable lease cost 4 50
Amortization of finance lease assets 2 38
Interest on finance lease liabilities 1 9
Total lease cost $ 4,646 $ 14,820