Summary of Components of Net Balance (Detail) - USD ($) $ in Thousands	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Goodwill [Line Items]
Goodwill	$ 1,384,397	$ 404,058
Accumulated impairment charges	(26,365)	(26,365)
Net balance	1,358,032	377,693	$ 377,693
European [Member]
Goodwill [Line Items]
Goodwill	980,339
Net balance	980,339
Other [Member]
Goodwill [Line Items]
Goodwill	42,871	42,871
Net balance	42,871	42,871	42,871
Towables [Member] | North American [Member]
Goodwill [Line Items]
Goodwill	343,935	343,935
Accumulated impairment charges	(9,113)	(9,113)
Net balance	334,822	334,822	$ 334,822
Motorized [Member] | North American [Member]
Goodwill [Line Items]
Goodwill	17,252	17,252
Accumulated impairment charges	$ (17,252)	$ (17,252)