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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2016 | Oct. 31, 2016 | Jul. 31, 2018 | Jul. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Borrowings on revolving credit facility |  |  |  | $ 360,000
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 |  |  |
Jayco, Corp. | Consideration Funded By Credit Facility |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Borrowings on revolving credit facility | $ 360,000 |  |  |
Dealer Network | Jayco, Corp. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets amortization period | 20 years |  |  |
Amortizable intangible assets, amortization method |  |  | Accelerated cash flow basis |
Trademarks |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Intangible assets amortization period |  |  | 17 years |
Trademarks | Jayco, Corp. |  |  |  |
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 |

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