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Commitments and Contingencies (Details 3) (USD $) In Millions, unless otherwise specified	Oct. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
Purchase commitments for inventory	$ 235.5

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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