Derivative Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain recognized in other comprehensive income (loss)	$ 451	$ 363	$ 1,148	$ 559
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ (60)	$ 105	$ (271)	$ 486