Income Taxes - Schedule of Deferred Income Tax Balances (Detail) - USD ($) $ in Thousands	Jul. 31, 2019	Jul. 31, 2018
Schedule Of Deferred Income Tax Assets And Liabilities [Line Items]
Inventory basis	$ 807	$ 922
Employee benefits	5,272	3,427
Self-insurance reserves	5,185	6,368
Accrued product warranties	62,563	62,332
Accrued incentives	6,144	5,235
Sales returns and allowances	1,516	1,741
Accrued expenses	3,617	1,905
Property, plant and equipment	(22,699)	(9,060)
Deferred compensation	15,247	12,864
Intangibles	(143,861)	(9,151)
Net operating loss and other carryforwards	15,725
Unrealized gain/loss	(4,546)
Unrecognized tax benefits	2,689	2,581
Other	2,759	(720)
Valuation allowance	(12,945)
Deferred income tax (liability), net	$ (62,527)
Deferred income tax asset, net		$ 78,444