Goodwill and Intangible Assets - Other Intangibles Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019	Jul. 31, 2019
Other Intangible Assets [Line Items]
Gross Carrying Amount	$ 65,477		$ 65,477		$ 65,466
Accumulated Amortization	(31,897)		(31,897)		(29,343)
Net Book Value	33,580		33,580		$ 36,123
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Amortization of Intangible Assets	1,291	$ 1,434	2,582	$ 2,870
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	5,163		5,163
Finite-Lived Intangible Assets, Amortization Expense, Year Two	5,163		5,163
Finite-Lived Intangible Assets, Amortization Expense, Year Three	4,894		4,894
Finite-Lived Intangible Assets, Amortization Expense, Year Four	2,025		2,025
Finite-Lived Intangible Assets, Amortization Expense, Year Five	0		$ 0
Customer relationships and other
Other Intangible Assets [Line Items]
Weighted Average Amortization Period			9 years		9 years
Gross Carrying Amount	46,561		$ 46,561		$ 46,595
Accumulated Amortization	(31,897)		(31,897)		(29,343)
Net Book Value	14,664		14,664		17,252
Trademarks
Other Intangible Assets [Line Items]
Gross Carrying Amount	18,916		18,916		18,871
Accumulated Amortization	0		0		0
Net Book Value	$ 18,916		$ 18,916		$ 18,871