Intangible Assets and Goodwill - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jan. 31, 2017	Oct. 31, 2016	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016	Jul. 31, 2016	Jun. 30, 2016
Intangible Assets And Goodwill [Line Items]
Amortization of intangible assets, finite lived	$ 15,279		$ 5,854	$ 33,494	$ 11,882
Goodwill	377,693			377,693		$ 377,693
Pre-tax, non-cash goodwill impairment charge					$ 9,113
Jayco, Corp.
Intangible Assets And Goodwill [Line Items]
Goodwill							$ 74,184
Jayco, Corp. | Backlog
Intangible Assets And Goodwill [Line Items]
Amortization of intangible assets, finite lived		$ 8,267
Towables
Intangible Assets And Goodwill [Line Items]
Goodwill	334,822			334,822		334,822
Other
Intangible Assets And Goodwill [Line Items]
Goodwill	$ 42,871			$ 42,871		$ 42,871