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Financial Instruments (Detail) - Schedule of Notional Amounts and fair Values (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Jan. 31, 2013
Interest rate swap	$ 2,345	$ 2,789
Interest Rate Swap [Member]
Interest rate swap	36,759
Interest rate swap	$ 2,345

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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