Derivatives and Hedging - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Jul. 31, 2020
Derivative [Line Items]
Foreign currency transaction gain (loss)	$ 1,984,000	$ 6,293,000	$ (8,969,000)	$ 9,136,000
Amount reclassified	0	$ 0	0	$ 0
Not designated as hedging instrument
Derivative [Line Items]
Notional amount	33,634,000		33,634,000		$ 34,862,000
Derivative liability	$ 1,774,000		$ 1,774,000		$ 1,824,000