Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2016	Apr. 30, 2015
Segment Reporting Information [Line Items]
Net sales	$ 1,284,054	$ 1,174,255	$ 3,289,476	$ 2,948,663
Income (loss) from continuing operations before income taxes	116,283	94,561	259,862	195,404
Corporate
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	(11,166)	(9,063)	(31,718)	(24,807)
Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	121,008	103,624	279,473	220,211
Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	96,893	83,771	213,186	173,390
Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	24,115	19,853	66,287	46,821
Operating Segments | Other
Segment Reporting Information [Line Items]
Income (loss) from continuing operations before income taxes	6,441		12,107
Continuing Operations
Segment Reporting Information [Line Items]
Net sales	1,284,054	1,174,255	3,289,476	2,948,663
Continuing Operations | Operating Segments | Recreational vehicles
Segment Reporting Information [Line Items]
Net sales	1,242,204	1,174,255	3,179,167	2,948,663
Continuing Operations | Operating Segments | Recreational vehicles | Towables
Segment Reporting Information [Line Items]
Net sales	934,574	919,358	2,377,571	2,294,226
Continuing Operations | Operating Segments | Recreational vehicles | Motorized
Segment Reporting Information [Line Items]
Net sales	307,630	$ 254,897	801,596	$ 654,437
Continuing Operations | Operating Segments | Other
Segment Reporting Information [Line Items]
Net sales	61,572		159,965
Continuing Operations | Intercompany Eliminations
Segment Reporting Information [Line Items]
Net sales	$ (19,722)		$ (49,656)