Derivatives and Hedging - Narrative (Details) - USD ($)	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Jul. 31, 2020
Derivative [Line Items]
Foreign currency transaction gain (loss)	$ 5,482,000	$ (1,254,000)
Amount reclassified	0	$ 0
Not designated as hedging instrument
Derivative [Line Items]
Notional amount	33,806,000		$ 34,862,000
Derivative liability	$ 1,854,000		$ 1,824,000