Derivatives and Hedging - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020	Jul. 31, 2020
Derivative [Line Items]
Foreign currency transaction gain (loss)	$ (16,436,000)	$ 3,802,000	$ (10,954,000)	$ 2,843,000
Amount reclassified	0			$ 0
Not designated as hedging instrument
Derivative [Line Items]
Notional amount	34,431,000		34,431,000		$ 34,862,000
Derivative liability	$ 1,932,000		$ 1,932,000		$ 1,824,000