Schedule of Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Jul. 31, 2016	Jul. 31, 2015
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Total net current deferred income tax asset		$ 59,864
Net deferred tax asset	$ 53,417	39,301
Current Deferred Income Tax Assets (Liabilities)
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Inventory basis		467
Employee benefits		3,625
Self-insurance reserves		10,411
Accrued product warranties		39,486
Accrued incentives		3,959
Sales returns and allowances		1,520
Accrued expenses		2,067
Unrecognized tax benefits		367
Other		(2,038)
Total net current deferred income tax asset		59,864
Noncurrent Deferred Income Tax Assets (Liabilities)
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Inventory basis	1,196
Employee benefits	4,587
Self-insurance reserves	10,504
Accrued product warranties	43,388
Accrued incentives	5,154
Sales returns and allowances	1,642
Accrued expenses	2,607
Property, plant and equipment	(4,164)	(707)
Deferred compensation	9,145	6,367
Tax credit carry forward	256	110
Intangibles	(22,308)	(30,246)
Unrecognized tax benefits	4,105	3,913
Other	$ (2,695)
Total net long-term deferred income tax (liability)		$ (20,563)