Operating Lease Cost (Details) - USD ($) $ in Thousands		12 Months Ended
	Aug. 01, 2019	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Operating Leased Assets [Line Items]
Operating Lease, Payments		$ 18,334	$ 17,123
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 9,769	$ 16,522	$ 12,641
Operating Lease, Weighted Average Remaining Lease Term		3 years	3 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent		3.30%	3.50%
Operating Lease, Cost				$ 19,984
Cost of Sales [Member]
Operating Leased Assets [Line Items]
Operating Lease, Cost		$ 8,268	$ 9,197
Selling, General and Administrative Expenses [Member]
Operating Leased Assets [Line Items]
Operating Lease, Cost		$ 8,625	$ 8,974