Leases (Lease Cost and Additional Information) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Leases [Abstract]
Amortization of ROU assets	$ 1,000	$ 3,000	$ 4,000	$ 7,000
Operating lease expense	2,756,000	2,940,000	5,593,000	5,864,000
Short-term lease expense	117,000	117,000	218,000	211,000
Variable lease expense	1,011,000	1,142,000	2,098,000	2,318,000
Sublease income	(16,000)	(16,000)	(33,000)	(33,000)
Total lease expense	$ 3,869,000	$ 4,186,000	7,880,000	8,367,000
Operating leases - Operating cash outflows			5,593,000	5,850,000
Finance leases - Financing cash outflows			4,000	11,000
ROU assets obtained in the exchange for lease liabilities (non-cash): operating leases			$ 2,838,000	$ 14,812,000