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Goodwill and Acquired Intangible Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2010
Goodwill and Intangible Assets Disclosure [Abstract]      
Intangible assets amortization expense $ 8.2 $ 6.3 $ 3.1