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Leases (Lease Cost and Additional Information) (Details) - USD ($)
 3 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Leases [Abstract]    
Amortization of ROU assets $ 3,000 $ 4,000
Interest on lease liabilities 0 0
Operating lease expense 2,837,000 2,924,000
Short-term lease expense 101,000 94,000
Variable lease expense 1,087,000 1,176,000
Sublease income (17,000) (17,000)
Total lease expense 4,011,000 4,181,000
Operating leases - Operating cash outflows 2,906,000 2,828,000
Finance leases - Financing cash outflows 3,000 6,000
ROU assets obtained in the exchange for lease liabilities (non-cash): operating leases $ 2,573,000 $ 6,667,000