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Leases (Lease Cost and Additional Information) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2024
Jan. 31, 2023
Leases [Abstract]        
Amortization of ROU assets $ 0 $ 1,000 $ 0 $ 4,000
Operating lease expense 2,080,000 2,756,000 4,338,000 5,593,000
Short-term lease expense 65,000 117,000 173,000 218,000
Variable lease expense 916,000 1,011,000 1,945,000 2,098,000
Sublease income (16,000) (16,000) (33,000) (33,000)
Total lease expense $ 3,045,000 $ 3,869,000 6,423,000 7,880,000
Operating leases - Operating cash outflows     4,439,000 5,593,000
Finance leases - Financing cash outflows     0 4,000
ROU assets obtained in the exchange for lease liabilities (non-cash): operating leases     $ 20,000 $ 2,838,000