Derivatives and Hedging - Narrative (Details) - USD ($)		3 Months Ended		9 Months Ended
	Feb. 01, 2019	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Jul. 31, 2019
Derivative [Line Items]
Foreign currency transaction gain (loss)		$ 6,293,000		$ 9,136,000
Amount reclassified		0		0
Not Designated as Hedging Instrument
Derivative [Line Items]
Foreign currency transaction gain (loss)	$ (70,777,000)
Notional amount		38,827,000		38,827,000		$ 35,700,000
Derivative liability		$ 1,604,000		$ 1,604,000		$ 1,226,000
Erwin Hymer Group | Not Designated as Hedging Instrument
Derivative [Line Items]
Foreign currency transaction gain (loss)			$ 2,930,000		$ (70,777,000)