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Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Disclosure Provision For Income Taxes Abstract
Income tax expense (benefit)	$ (2,764)	$ (3,595)	$ (1,983)	$ (2,984)
Effective Tax Rate	(19.00%)	(487.00%)	(5.00%)	297.00%

- 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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