Intangible Assets and Goodwill - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Jul. 31, 2016	Jun. 30, 2016
Intangible Assets And Goodwill [Line Items]
Amortization of intangible assets, finite lived	$ 18,215	$ 6,028
Goodwill	377,693		$ 377,693
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
Other
Intangible Assets And Goodwill [Line Items]
Goodwill	$ 42,871		$ 42,871