Intangible Assets and Goodwill - Additional Information (Detail) - USD ($) $ in Thousands	Oct. 31, 2015	Jul. 31, 2015
Intangible Assets And Goodwill [Line Items]
Goodwill	$ 312,622	$ 312,622
Towables
Intangible Assets And Goodwill [Line Items]
Goodwill	269,751	269,751
Other
Intangible Assets And Goodwill [Line Items]
Goodwill	$ 42,871	$ 42,871