Derivatives and Hedging - Narrative (Details) - USD ($)		3 Months Ended	6 Months Ended
	Feb. 01, 2019	Jan. 31, 2020	Jan. 31, 2020	Jul. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Foreign currency transaction gain (loss)		$ 3,802,000	$ 2,843,000
Amount reclassified		0	0
Not Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Foreign currency transaction gain (loss)	$ (70,777,000)
Derivative [Line Items]
Notional amount		$ 34,093,000	$ 34,093,000	$ 35,700,000