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Summary of Revenues by Geographic Region (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2011
Geographic Information [Line Items]                      
Revenues $ 1,236,773 $ 1,216,768 $ 1,173,617 $ 1,182,123 $ 1,090,001 $ 1,079,235 $ 1,057,244 $ 1,073,785 $ 4,809,281 $ 4,300,265 $ 4,246,842
Domestic country
                     
Geographic Information [Line Items]                      
Revenues                 4,710,821 4,253,793 4,198,937
All other countries
                     
Geographic Information [Line Items]                      
Revenues                 $ 98,460 $ 46,472 $ 47,905