Goodwill and Acquired Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization expense	$ 2.2	$ 2.1
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	8.7
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Patents and other technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 0.2
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years