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Condensed Consolidating Financial Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Oct. 31, 2012
Condensed Financial Statements, Captions [Line Items]    
Publicly registered U.S. senior notes $ 813,942 $ 757,969
U.S. [Member] | Senior Notes [Member]
   
Condensed Financial Statements, Captions [Line Items]    
Publicly registered U.S. senior notes $ 400,000 $ 400,000