Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Apr. 30, 2016	[1]	Apr. 30, 2015	Apr. 30, 2016		Apr. 30, 2015
Income Tax Disclosure [Abstract]
Effective income tax rate reconciliation, percent	34.20%		40.60%	13.60%	[2]	28.70%	[3]
Tax Credit				$ 4.8		$ 3.6
Tax credit state employment based						$ 1.8

[1] The effective tax rate for the three months ended April 30, 2016 was lower than the rate for the three months ended April 30, 2015 primarily due to the positive impact of the 2016 WOTC.

[2] Reflects $4.8 million of WOTC from the retroactive reinstatement of the WOTC for calendar year 2015, as well as the impact of the 2016 WOTC.

[3] Reflects $3.6 million of credits from the retroactive reinstatement of the WOTC for calendar year 2014 and state employment-based tax credits of $1.8 million.