Schedule of Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Inventory basis	$ 467	$ (183)
Employee benefits	3,625	2,543
Self-insurance reserves	10,411	10,139
Accrued product warranties	39,486	33,629
Accrued incentives	3,959	3,553
Sales returns and allowances	1,520	1,419
Accrued expenses	2,067	1,523
Unrecognized tax benefits	367	614
Other	(2,038)	(1,840)
Total net current deferred income tax asset	59,864	51,397
Property, plant and equipment	(707)	(983)
Deferred compensation	6,367	4,811
Tax credit carry forward	110	790
Intangibles	(30,246)	(31,681)
Unrecognized tax benefits	3,913	7,675
Total net long-term deferred income tax (liability)	(20,563)	(19,388)
Net deferred tax asset	$ 39,301	$ 32,009