Goodwill and Intangible Assets - Other Intangibles Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Jul. 31, 2018
Other Intangible Assets [Line Items]
Gross Carrying Amount	$ 71,622		$ 71,622		$ 81,460
Accumulated Amortization	(33,487)		(33,487)		(38,872)
Net Book Value	38,135		38,135		$ 42,588
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of Intangible Assets	1,443	$ 1,620	4,314	$ 4,930
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	5,708		5,708
Finite-Lived Intangible Assets, Amortization Expense, Year Two	5,183		5,183
Finite-Lived Intangible Assets, Amortization Expense, Year Three	5,144		5,144
Finite-Lived Intangible Assets, Amortization Expense, Year Four	5,002		5,002
Finite-Lived Intangible Assets, Amortization Expense, Year Five	2,025		$ 2,025
Customer relationships and other
Other Intangible Assets [Line Items]
Weighted Average Amortization Period			8 years		9 years
Gross Carrying Amount	52,203		$ 52,203		$ 61,944
Accumulated Amortization	(33,487)		(33,487)		(38,872)
Net Book Value	18,716		18,716		23,072
Trademarks
Other Intangible Assets [Line Items]
Gross Carrying Amount	19,419		19,419		19,516
Accumulated Amortization	0		0		0
Net Book Value	$ 19,419		$ 19,419		$ 19,516