Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended			0 Months Ended
	Oct. 15, 2011	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012	Oct. 10, 2014
Loss Contingencies [Line Items]
Rent expenses		$ 65.6	$ 64.4	$ 62.0
Number of buildings to be leased	2
Total square feet of buildings	341,000
Lease initiation date	March 1, 2015
Lease expiration period, (in years)	15 years
Extended lease term, years	19 years
Mentor litigation
Loss Contingencies [Line Items]
Jury verdict assessing damages, value					$ 36