Property Plant and Equipment (Details) - USD ($)	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 203,512,000	$ 201,195,000
Less accumulated depreciation and amortization	150,483,000	150,832,000
Property, plant and equipment, net	53,029,000	50,363,000
Depreciation and amortization	11,917,000	10,303,000	$ 9,343,000
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	193,832,000	186,935,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,680,000	$ 14,260,000