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Condensed Consolidating Financial Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Jul. 31, 2013 Senior notes 2020 [Member]	Jul. 16, 2013 Senior notes 2020 [Member]
Debt Instrument [Line Items]
Notes issued, aggregate principal amount	$ 831,300	$ 757,969	$ 225,000	$ 225,000

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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