Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands				3 Months Ended	12 Months Ended
	Jun. 30, 2016	May 01, 2015	Jan. 05, 2015	Jul. 31, 2015	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Business Acquisition [Line Items]
Borrowings on revolving credit facility						$ 360,000
Payment to acquire business, net					$ 5,039	$ 557,651	$ 194,486
Jayco, Corp.
Business Acquisition [Line Items]
Payment to acquire business	$ 576,060
Asset purchase agreement date	Jun. 30, 2016
Asset purchase effective date	Jun. 30, 2016
Purchase price adjustment	$ 5,039
Amortizable intangible assets, weighted average useful life	19 years 3 months 18 days
Payment to acquire business, net	$ 562,690
Cash on hand at the acquisition date	18,409
Jayco, Corp. | Consideration Funded By Credit Facility
Business Acquisition [Line Items]
Borrowings on revolving credit facility	$ 360,000
Postle Operating, LLC
Business Acquisition [Line Items]
Asset purchase agreement date							May 01, 2015
Asset purchase effective date					May 01, 2015
Amortizable intangible assets, weighted average useful life		12 years 3 months 18 days
Payment to acquire business, net		$ 144,048
Cash on hand at the acquisition date		$ 2,963
Cruiser RV, LLC and DRV, LLC
Business Acquisition [Line Items]
Payment to acquire business			$ 47,412
Asset purchase agreement date			Dec. 31, 2014
Purchase price adjustment				$ 1,173
Amortizable intangible assets, weighted average useful life			13 years 10 months 24 days
Payment to acquire business, net			$ 47,523	47,523
Cash on hand at the acquisition date			$ 1,062	$ 1,062			$ 1,062
Dealer Networks | Jayco, Corp.
Business Acquisition [Line Items]
Intangible assets amortization period	20 years
Amortizable intangible assets, amortization method					Accelerated cash flow basis
Dealer Networks | Cruiser RV, LLC and DRV, LLC
Business Acquisition [Line Items]
Intangible assets amortization period			12 years
Amortizable intangible assets, amortization method					Accelerated cash flow basis
Trademarks
Business Acquisition [Line Items]
Intangible assets amortization period					18 years
Trademarks | Jayco, Corp.
Business Acquisition [Line Items]
Intangible assets amortization period	20 years
Amortizable intangible assets, amortization method					Straight-line basis
Trademarks | Postle Operating, LLC
Business Acquisition [Line Items]
Intangible assets amortization period		15 years
Amortizable intangible assets, amortization method					Straight-line basis
Trademarks | Cruiser RV, LLC and DRV, LLC
Business Acquisition [Line Items]
Intangible assets amortization period			20 years
Amortizable intangible assets, amortization method					Straight-line basis
Backlog | Jayco, Corp.
Business Acquisition [Line Items]
Intangible assets amortization period	3 months
Amortizable intangible assets, amortization method					Straight-line basis
Backlog | Postle Operating, LLC
Business Acquisition [Line Items]
Intangible assets amortization period		42 days
Amortizable intangible assets, amortization method					Straight-line basis
Backlog | Cruiser RV, LLC and DRV, LLC
Business Acquisition [Line Items]
Intangible assets amortization period			42 days
Amortizable intangible assets, amortization method					Straight-line basis
Customer Relationships | Postle Operating, LLC
Business Acquisition [Line Items]
Intangible assets amortization period		12 years
Amortizable intangible assets, amortization method					Accelerated cash flow basis