Intangible Assets and Goodwill - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Goodwill [Line Items]
Impairment charges	$ 0	$ 10,057	$ 0	$ 10,057
Goodwill impairment loss				1,109
North American Towables \| North America \| Recreational vehicles
Goodwill [Line Items]
Goodwill impairment loss		$ 1,109		$ 1,109

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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