Intangible Assets and Goodwill - Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Jul. 31, 2020	Jul. 31, 2019
Goodwill [Line Items]
Goodwill	$ 1,577,828	$ 1,396,401	$ 1,476,541	$ 1,358,032
Goodwill acquired	80,218	62,366
Measurement period adjustments	569	1,282
Foreign currency translation	20,500	(24,243)
Impairment charge		(1,036)
Other
Goodwill [Line Items]
Goodwill	122,708	105,237	104,826	42,871
Goodwill acquired	17,882	62,366
Measurement period adjustments	0	0
Foreign currency translation	0	0
Impairment charge		0
Europe | Recreational vehicles
Goodwill [Line Items]
Goodwill	1,058,429	957,378	1,037,929	980,339
Goodwill acquired	0
Measurement period adjustments	0	1,282
Foreign currency translation	20,500	(24,243)
Impairment charge		0
North American Towables | North America | Recreational vehicles
Goodwill [Line Items]
Goodwill	344,975	333,786	333,786	334,822
Goodwill acquired	18,845	0
Measurement period adjustments	(7,656)	0
Foreign currency translation	0	0
Impairment charge		(1,036)
North American Motorized | North America | Recreational vehicles
Goodwill [Line Items]
Goodwill	51,716	0	$ 0	$ 0
Goodwill acquired	43,491	0
Measurement period adjustments	8,225	0
Foreign currency translation	$ 0	0
Impairment charge		$ 0