Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2014 state	Jul. 31, 2013	Jul. 31, 2014 state	Jul. 31, 2013
Income Tax Disclosure [Abstract]
Effective income tax rate reconciliation, percent	40.50%	40.50%	41.60%	35.80%
Unrecognized tax benefits	$ 88.6		$ 88.6
Unrecognized tax benefits, if recognized	$ 81.9		$ 81.9
Number of states in which entity operates	50		50