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Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Disclosure Provision For Income Taxes Abstract
Income tax expense (benefit)	$ 1,148	$ (1,445)	$ (835)	$ (4,429)
Effective Tax Rate	3.50%	(6.40%)	(1.10%)	(20.50%)

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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