Provision for Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Jul. 31, 2016
Income Tax [Line Items]
Effective income tax rate	32.00%	34.70%
New accounting pronouncement or change in accounting principle, effect of change on net income	$ 1,843
Interest and penalties related to uncertain tax benefits			$ 96
Decreases in unrecognized tax benefits resulting from effective settlement	892
Income tax benefit related to gross uncertain tax benefit releases, net	580
Expected decrease in unrecognized tax benefits due to resolution of uncertain tax positions	4,556
Expected decrease in interest due to resolution of uncertain tax positions	$ 922