Assets And Liabilities Measured At Fair Value On Recurring Basis (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
Jul. 31, 2012 Year
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration arising from a business combination	$ 0.7
Contingent consideration payable period (in years)	2

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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+ Details