Schedule of Deferred Income Taxes (Detail) - Noncurrent Deferred Income Tax Assets (Liabilities) - USD ($) $ in Thousands	Jul. 31, 2018	Jul. 31, 2017
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Inventory basis	$ 922	$ 1,460
Employee benefits	3,427	6,471
Self-Insurance Reserves	6,368	9,940
Accrued product warranties	62,332	73,393
Accrued incentives	5,235	6,175
Sales returns and allowances	1,741	2,340
Accrued expenses	1,905	3,399
Property, plant and equipment	(9,060)	(8,151)
Deferred compensation	12,864	14,556
Intangibles	(9,151)	(17,184)
Unrecognized tax benefits	2,581	3,925
Other	(720)	(3,355)
Deferred income tax asset, net	$ 78,444	$ 92,969