Intangible Assets and Goodwill - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020	Jul. 31, 2020	Jul. 31, 2019
Goodwill [Line Items]
Goodwill	$ 1,353,120	$ 1,581,990	$ 1,353,120	$ 1,476,541	$ 1,358,032
Goodwill acquired		80,218
Measurement period adjustments			5,087
Foreign currency translation		25,231	(8,890)
Impairment charge			(1,109)
Other
Goodwill [Line Items]
Goodwill	42,871	122,708	42,871	104,826	42,871
Goodwill acquired		17,882
Measurement period adjustments			0
Foreign currency translation		0	0
Impairment charge			0
Europe | Recreational vehicles
Goodwill [Line Items]
Goodwill	976,536	1,063,160	976,536	1,037,929	980,339
Goodwill acquired		0
Measurement period adjustments			5,087
Foreign currency translation		25,231	(8,890)
Impairment charge			0
North American Towables | North America | Recreational vehicles
Goodwill [Line Items]
Goodwill	333,712	352,631	333,712	333,786	334,822
Goodwill acquired		18,845
Measurement period adjustments			0
Foreign currency translation		0	0
Impairment charge	(1,109)		(1,109)
North American Motorized | North America | Recreational vehicles
Goodwill [Line Items]
Goodwill	$ 0	43,491	0	$ 0	$ 0
Goodwill acquired		43,491
Measurement period adjustments			0
Foreign currency translation		$ 0	0
Impairment charge			$ 0