Selected Quarterly Financial Data (Unaudited) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2014		Oct. 31, 2013		Oct. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 1,298.9	$ 1,276.1	$ 1,231.3	$ 1,226.5	$ 1,236.8	$ 1,216.8	$ 1,173.6	$ 1,182.1	$ 5,032.8	[1]	$ 4,809.3	[1]	$ 4,300.3	[1]
Gross profit	142.0	131.4	127.9	118.0	135.2	121.1	125.4	114.2
Net income	$ 27.9	$ 19.4	$ 15.2	$ 13.1	$ 24.2	$ 16.0	$ 19.3	$ 13.4	$ 75.6		$ 72.9		$ 62.6
Net income per common share-Basic (in usd per share)	$ 0.50	$ 0.34	$ 0.27	$ 0.23	$ 0.44	$ 0.29	$ 0.35	$ 0.25	$ 1.35		$ 1.33		$ 1.16
Net income per common share-Diluted (in usd per share)	$ 0.49	$ 0.34	$ 0.27	$ 0.23	$ 0.43	$ 0.29	$ 0.35	$ 0.24	$ 1.32		$ 1.30		$ 1.14

[1] Substantially all of our long-lived assets are related to United States operations.