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Leases (Lease Cost and Additional Information) (Details) - USD ($)
 12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Leases [Abstract]    
Amortization of ROU assets $ 36,000 $ 175,000
Interest on lease liabilities 3,000 4,000
Operating lease expense 12,152,000 10,728,000
Short-term lease expense 819,000 3,045,000
Variable lease expense 4,523,000 4,033,000
Sublease income (67,000) (22,000)
Total lease expense 17,466,000 17,963,000
Operating leases - Operating cash outflows 10,868,000 11,437,000
Finance leases - Operating cash outflows 3,000 4,000
Finance leases - Financing cash outflows 38,000 322,000
ROU assets obtained in the exchange for lease liabilities (non-cash): operating leases $ 24,987,000 $ 3,561,000