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Leases (Lease Cost and Additional Information) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Leases [Abstract]        
Amortization of ROU assets $ 3,000 $ 16,000 $ 7,000 $ 28,000
Interest on lease liabilities 0 1,000 0 2,000
Operating lease expense 2,940,000 2,861,000 5,864,000 5,349,000
Short-term lease expense 117,000 255,000 211,000 502,000
Variable lease expense 1,142,000 1,190,000 2,318,000 2,154,000
Sublease income (16,000) (16,000) (33,000) (33,000)
Total lease expense $ 4,186,000 $ 4,307,000 8,367,000 8,002,000
Operating leases - Operating cash outflows     5,850,000 5,050,000
Finance leases - Operating cash outflows     0 2,000
Finance leases - Financing cash outflows     11,000 28,000
ROU assets obtained in the exchange for lease liabilities (non-cash): operating leases     $ 14,812,000 $ 25,663,000