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Note 2 (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Allocated Share-based Compensation Expense $ 0.8 $ 1.5 $ 3.7 $ 5.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 0.7 $ 1.1 $ 3.3 $ 3.7