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Leases (Lease Cost and Additional Information) (Details) - USD ($)
 12 Months Ended
Jul. 31, 2024
Jul. 31, 2023
Jul. 31, 2022
Leases [Abstract]      
Amortization of ROU assets $ 0 $ 5,000 $ 13,000
Interest on lease liabilities 0 0 1,000
Operating lease expense 8,414,000 10,439,000 11,658,000
Short-term lease expense 293,000 435,000 402,000
Variable lease expense 4,381,000 4,031,000 4,619,000
Sublease income (67,000) (67,000) (67,000)
Total lease expense 13,021,000 14,843,000 16,626,000
Operating leases - Operating cash outflows 8,983,000 10,604,000 11,864,000
Finance leases - Operating cash outflows 0 0 1,000
Finance leases - Financing cash outflows 0 4,000 15,000
ROU assets obtained in the exchange for lease liabilities (non-cash): operating leases $ 677,000 $ 3,211,000 $ 15,233,000