Business Combinations (Other Fiscal Twenty Twelve, Twenty Eleven and Twenty Ten Acquisitions) - Additional Information (Detail) (USD $)	12 Months Ended		12 Months Ended
	Oct. 31, 2010 Other Fiscal 2010 Acquisitions Y	Oct. 31, 2012 Other Fiscal 2010 Acquisitions	Oct. 31, 2010 Other Fiscal 2010 Acquisitions Minimum	Oct. 31, 2010 Other Fiscal 2010 Acquisitions Maximum	Oct. 31, 2012 Two Thousand Twelve Acquisitions	Oct. 31, 2012 Two Thousand Twelve Acquisitions Minimum	Oct. 31, 2012 Two Thousand Twelve Acquisitions Maximum	Oct. 31, 2011 Fiscal Two Thousand Eleven Acquisitions	Oct. 31, 2011 Fiscal Two Thousand Eleven Acquisitions Minimum	Oct. 31, 2011 Fiscal Two Thousand Eleven Acquisitions Maximum
Business Acquisition [Line Items]
Number of acquisitions completed	7				5			2
Total purchase consideration	$ 221,700,000				$ 212,900,000			$ 37,400,000
Goodwill arising from acquisition	110,800,000				123,400,000			30,600,000
Acquired goodwill expected to be deductible for tax purposes					11,800,000
Identifiable intangibles assets acquired	92,800,000				73,300,000			9,300,000
Definite lived intangible asset amortization period			1 year	10 years		1 year	8 years		2 years	10 years
Acquisition-related costs	10,600,000				6,800,000
Payable if milestones are achieved	10,000,000
Achievement of milestone period (in years)	3
Business acquisition, contingent consideration, at fair value on acquisition date	7,800,000
Contingent consideration liability		$ 0