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Finacial Instruments And Fair Value Measurements - Senior Notes Estimated Fair Value Compared to Carrying Amount (Detail) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2014
Oct. 31, 2013
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Line Items]    
Carrying amount $ 1,358.3 $ 1,217.2
Senior Notes Due 2017 [Member]
   
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Line Items]    
Estimated fair value 332.4 334.5
Carrying amount 301.6 301.8
Senior Notes Due 2019 [Member]
   
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Line Items]    
Estimated fair value 282.6 289.9
Carrying amount 244.5 244.4
Senior Notes Due 2021 [Member]
   
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments [Line Items]    
Estimated fair value 321.9 317.9
Carrying amount $ 270.8 $ 272.9