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Fair Values and Balance Sheet Presentation of Derivative Instruments which Include Cash Flow Forwards and Non-designated Forwards (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Liability Derivatives
Liability derivatives	$ (326)	$ (874)
Other receivables
Asset Derivatives
Asset derivatives	$ 1,208	$ 1,700

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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