Intangible Assets and Goodwill - Additional Information (Detail) - USD ($) $ in Thousands	Apr. 30, 2018	Jul. 31, 2017
Intangible Assets And Goodwill [Line Items]
Goodwill	$ 377,693	$ 377,693
Recreational vehicles | Towables
Intangible Assets And Goodwill [Line Items]
Goodwill	334,822	334,822
Other
Intangible Assets And Goodwill [Line Items]
Goodwill	$ 42,871	$ 42,871