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Condensed Consolidating Financial Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
Oct. 31, 2012
Condensed Financial Statements, Captions [Line Items]    
Publicly registered senior notes $ 788,446 $ 757,969
Senior Notes [Member]
   
Condensed Financial Statements, Captions [Line Items]    
Publicly registered senior notes $ 400,000 $ 400,000