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Note 6 - Share-Based Compensation (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Number of Shares Counted Against the Plan's Share Reserve for Every One Share Issued in Connection with Stock Awards 1.67  
Number of Shares Counted Against the Plan's Share Reserve for Each One Share Returned Or Deemed Not To Have Been Issued from the Plan 1.67  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) $ 6.56 $ 6.23
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars) $ 2.0 $ 5.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 257,000 1,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 500,000 400,000
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period Grant Date Fair Value (in Dollars) 3.5 2.7
Stock Issued During Period, Shares, Restricted Stock Award, Gross 400,000 500,000
Stock Issued During Period, Value, Restricted Stock Award, Gross (in Dollars) 6.1 5.6
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) $ 14.86 $ 12.35
The 2012 Plan [Member] | New Awards and Outstanding Awards Under 2012 Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 6,700,000  
The 2012 Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 7,400,000  
Stock Options [Member]
   
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars) 6.0  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 1 year 328 days  
Restricted Stock [Member]
   
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars) $ 9.9  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years