Leases (Lease Cost and Additional Information) (Details) - USD ($)	3 Months Ended
	Oct. 31, 2023	Oct. 31, 2022
Leases [Abstract]
Amortization of ROU assets	$ 0	$ 3,000
Operating lease expense	2,258,000	2,837,000
Short-term lease expense	108,000	101,000
Variable lease expense	1,029,000	1,087,000
Sublease income	(17,000)	(17,000)
Total lease expense	3,378,000	4,011,000
Operating leases - Operating cash outflows	2,319,000	2,906,000
Finance leases - Financing cash outflows	0	3,000
ROU assets obtained in the exchange for lease liabilities (non-cash): operating leases	$ 20,000	$ 2,573,000