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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2022	May 01, 2021	Apr. 30, 2022	May 01, 2021
Changes in Accumulated Other Comprehensive Income (Loss) By Component
Stockholders' equity, beginning balance	$ 461,082,000	$ 433,534,000	$ 460,849,000	$ 401,037,000
Other comprehensive income (loss) before reclassifications	(3,668,000)	25,000	(6,088,000)	679,000
Amounts reclassified from AOCI	1,000	(17,000)	1,000	(131,000)
Total other comprehensive income (loss), net of tax	(3,667,000)	8,000	(6,087,000)	548,000
Stockholders' equity, ending balance	389,506,000	429,382,000	389,506,000	429,382,000
Tax (benefit) expense for gains and losses on available-for-sale securities	0	0	0	0
Total
Changes in Accumulated Other Comprehensive Income (Loss) By Component
Stockholders' equity, beginning balance	991,000	3,268,000	3,411,000	2,728,000
Total other comprehensive income (loss), net of tax	(3,667,000)	8,000	(6,087,000)	548,000
Stockholders' equity, ending balance	(2,676,000)	3,276,000	(2,676,000)	3,276,000
Available-for-sale Securities
Changes in Accumulated Other Comprehensive Income (Loss) By Component
Stockholders' equity, beginning balance	(1,259,000)	162,000	(290,000)	1,213,000
Other comprehensive income (loss) before reclassifications	(1,284,000)	(282,000)	(2,253,000)	(1,219,000)
Amounts reclassified from AOCI	1,000	(17,000)	1,000	(131,000)
Total other comprehensive income (loss), net of tax	(1,283,000)	(299,000)	(2,252,000)	(1,350,000)
Stockholders' equity, ending balance	(2,542,000)	(137,000)	(2,542,000)	(137,000)
Foreign Currency Translation
Changes in Accumulated Other Comprehensive Income (Loss) By Component
Stockholders' equity, beginning balance	2,250,000	3,106,000	3,701,000	1,515,000
Other comprehensive income (loss) before reclassifications	(2,384,000)	307,000	(3,835,000)	1,898,000
Amounts reclassified from AOCI	0	0	0	0
Total other comprehensive income (loss), net of tax	(2,384,000)	307,000	(3,835,000)	1,898,000
Stockholders' equity, ending balance	$ (134,000)	$ 3,413,000	$ (134,000)	$ 3,413,000

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount, before adjustment, of tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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