Changes in Carrying Amount of Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 377,693	$ 377,693
No activity
Goodwill acquired	1,008,472
Goodwill, Foreign currency translation	(28,133)
Goodwill, Ending Balance	1,358,032	377,693
Europe [Member]
Goodwill [Line Items]
No activity
Goodwill acquired	1,008,472
Goodwill, Foreign currency translation	(28,133)
Goodwill, Ending Balance	980,339
Other Segments [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	42,871	42,871
No activity
Goodwill, Ending Balance	42,871	42,871
Towables [Member] | North American [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	334,822	334,822
No activity
Goodwill, Ending Balance	$ 334,822	334,822
Motorized [Member] | North American [Member]
Goodwill [Line Items]
No activity