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Condensed Consolidating Financial Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Oct. 31, 2012	Oct. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Publicly registered U.S. senior notes	$ 813,942	$ 757,969	$ 747,686
Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Publicly registered U.S. senior notes		400,000	400,000
U.S. [Member] \| Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Publicly registered U.S. senior notes	$ 400,000	$ 400,000

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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