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INTANGIBLE ASSETS AND GOODWILL - Changes in Carrying Amount of Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2020 | Jul. 31, 2020 | Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2019
Goodwill [Line Items] |  |  |  |  |
Goodwill, Beginning Balance | $ 1,476,541 |  | $ 1,476,541 | $ 1,358,032 |
Goodwill acquired |  |  | 80,218 | 62,366 |
Measurement period adjustment |  |  | 2,728 | 871 |
Foreign currency translation and other |  |  | 3,768 | 56,308 |
Impairment charge | 0 | $ 0 | 0 | (1,036) | $ 0
Goodwill, Ending Balance |  | 1,476,541 | 1,563,255 | 1,476,541 | 1,358,032
Other |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Beginning Balance | 104,826 |  | 104,826 | 42,871 |
Goodwill acquired |  |  | 17,882 | 62,366 |
Measurement period adjustment |  |  | 0 | (411) |
Foreign currency translation and other |  |  | 0 | 0 |
Impairment charge |  |  |  |  |
Goodwill, Ending Balance |  | 104,826 | 122,708 | 104,826 | 42,871
North American Towables | Operating Segments |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Beginning Balance | 333,786 |  | 333,786 | 334,822 |
Goodwill acquired |  |  | 18,845 | 0 |
Measurement period adjustment |  |  | (7,656) | 0 |
Foreign currency translation and other |  |  | 0 | 0 |
Impairment charge |  |  |  | (1,036) |
Goodwill, Ending Balance |  | 333,786 | 344,975 | 333,786 | 334,822
North American Motorized | Operating Segments |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Beginning Balance | 0 |  | 0 | 0 |
Goodwill acquired |  |  | 43,491 | 0 |
Measurement period adjustment |  |  | 10,384 | 0 |
Foreign currency translation and other |  |  | 0 | 0 |
Impairment charge |  |  |  |  |
Goodwill, Ending Balance |  | 0 | 53,875 | 0 | 0
European | Operating Segments |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Beginning Balance | $ 1,037,929 |  | 1,037,929 | 980,339 |
Goodwill acquired |  |  | 0 | 0 |
Measurement period adjustment |  |  | 0 | 1,282 |
Foreign currency translation and other |  |  | 3,768 | 56,308 |
Impairment charge |  |  |  |  |
Goodwill, Ending Balance |  | $ 1,037,929 | $ 1,041,697 | $ 1,037,929 | $ 980,339

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