Leases (Lease Cost and Additional Information) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2023
Leases [Abstract]
Amortization of ROU assets	$ 0	$ 0	$ 5,000
Operating lease expense	7,489,000	8,414,000	10,439,000
Short-term lease expense	137,000	293,000	435,000
Variable lease expense	4,560,000	4,381,000	4,031,000
Sublease income	(28,000)	(67,000)	(67,000)
Total lease expense	12,158,000	13,021,000	14,843,000
Operating leases - Operating cash outflows	8,277,000	8,983,000	10,604,000
Finance leases - Financing cash outflows	0	0	4,000
ROU assets obtained in the exchange for lease liabilities (non-cash): operating leases	$ 5,428,000	$ 677,000	$ 3,211,000