Changes in Carrying Amount of Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Goodwill [Line Items]
Goodwill, gross	$ 329,874		$ 255,355
Accumulated impairment charges	(17,252)		(17,252)
Goodwill, Beginning Balance	256,579	$ 238,103
Goodwill acquired	56,043	18,476
Goodwill, Ending Balance	312,622	256,579
Towables
Goodwill [Line Items]
Goodwill, gross	269,751		238,103
Goodwill, Beginning Balance	256,579	238,103
Goodwill acquired	13,172	18,476
Goodwill, Ending Balance	269,751	$ 256,579
Motorized
Goodwill [Line Items]
Goodwill, gross	17,252		17,252
Accumulated impairment charges	(17,252)		$ (17,252)
Other
Goodwill [Line Items]
Goodwill, gross	42,871
Goodwill acquired	42,871
Goodwill, Ending Balance	$ 42,871