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Property Plant and Equipment (Details) - USD ($)	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 186,326,000	$ 171,910,000
Less accumulated depreciation and amortization	151,040,000	144,873,000
Property, plant and equipment, net	35,286,000	27,037,000
Depreciation and amortization	9,343,000	10,386,000	$ 11,927,000
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	170,600,000	156,314,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 15,726,000	$ 15,596,000

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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