Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Income Tax Disclosure [Abstract]
Tax benefit from expiring status of limitation	$ 19.0	$ 3.4	$ 19.0	$ 3.4
Tax benefit from expiring status of limitation, related interest			1.0
Benefits relating to adoption of ASU 2016-09	$ 1.8		1.8
Work Opportunity Tax Credit			4.9	3.6
Tax benefit, deductions for energy efficient government buildings			$ 1.2
Tax credit state employment based		$ 1.8		$ 1.8