Operating Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Operating Leased Assets [Line Items]
Operating Lease, Payments	$ 17,123
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 12,641
Operating Lease, Weighted Average Remaining Lease Term	3 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent	3.50%
Operating Lease, Cost		$ 19,984	$ 15,938
Cost of Sales [Member]
Operating Leased Assets [Line Items]
Operating Lease, Cost	$ 9,197
Selling, General and Administrative Expenses [Member]
Operating Leased Assets [Line Items]
Operating Lease, Cost	$ 8,974