INTANGIBLE ASSETS AND GOODWILL - Changes in Carrying Amount of Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Oct. 31, 2020	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 1,476,541		$ 1,476,541	$ 1,358,032
Goodwill acquired			80,218	62,366
Measurement period adjustment			2,728	871
Foreign currency translation and other			3,768	56,308
Impairment charge	0	$ 0	0	(1,036)	$ 0
Goodwill, Ending Balance		1,476,541	1,563,255	1,476,541	1,358,032
Other
Goodwill [Line Items]
Goodwill, Beginning Balance	104,826		104,826	42,871
Goodwill acquired			17,882	62,366
Measurement period adjustment			0	(411)
Foreign currency translation and other			0	0
Impairment charge
Goodwill, Ending Balance		104,826	122,708	104,826	42,871
North American Towables | Operating Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	333,786		333,786	334,822
Goodwill acquired			18,845	0
Measurement period adjustment			(7,656)	0
Foreign currency translation and other			0	0
Impairment charge				(1,036)
Goodwill, Ending Balance		333,786	344,975	333,786	334,822
North American Motorized | Operating Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	0		0	0
Goodwill acquired			43,491	0
Measurement period adjustment			10,384	0
Foreign currency translation and other			0	0
Impairment charge
Goodwill, Ending Balance		0	53,875	0	0
European | Operating Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 1,037,929		1,037,929	980,339
Goodwill acquired			0	0
Measurement period adjustment			0	1,282
Foreign currency translation and other			3,768	56,308
Impairment charge
Goodwill, Ending Balance		$ 1,037,929	$ 1,041,697	$ 1,037,929	$ 980,339