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Condensed Consolidating Financial Information - 2015 Notes - Additional information (Detail) (USD $)	Jul. 31, 2013	Oct. 31, 2012	Oct. 31, 2011
Parent Company Only Financial Information [Line Items]
Long term debt	$ 1,259,414,000	$ 757,969,000	$ 747,686,000
Percentage of ownership owned by parent in guarantor subsidiaries	100.00%
Senior Notes 2015 [Member]
Parent Company Only Financial Information [Line Items]
Long term debt	400,000,000
Long term debt including accrued interest	$ 409,000,000

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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