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Summary of Components of Net Balance (Detail) - USD ($) $ in Thousands | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill | $ 1,384,397 | $ 404,058 |
Accumulated impairment charges | (26,365) | (26,365) |
Net balance | 1,358,032 | 377,693 | $ 377,693
European [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 980,339 |  |
Net balance | 980,339 |  |
Other [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 42,871 | 42,871 |
Net balance | 42,871 | 42,871 | 42,871
Towables [Member] | North American [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 343,935 | 343,935 |
Accumulated impairment charges | (9,113) | (9,113) |
Net balance | 334,822 | 334,822 | $ 334,822
Motorized [Member] | North American [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 17,252 | 17,252 |
Accumulated impairment charges | $ (17,252) | $ (17,252) |

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