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Summary of Components of Net Balance (Detail) - USD ($) $ in Thousands | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill, gross | $ 404,058 |  |
Accumulated impairment charges | (26,365) |  |
Goodwill | 377,693 | $ 312,622 | $ 256,579
Towables |  |  |
Goodwill [Line Items] |  |  |
Goodwill, gross | 343,935 |  |
Accumulated impairment charges | (9,113) |  |
Goodwill | 334,822 | 269,751 | $ 256,579
Motorized |  |  |
Goodwill [Line Items] |  |  |
Goodwill, gross | 17,252 |  |
Accumulated impairment charges | (17,252) |  |
Other |  |  |
Goodwill [Line Items] |  |  |
Goodwill, gross | 42,871 |  |
Goodwill | $ 42,871 | $ 42,871 |

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