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Effective Tax Rate and Period Specific Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010
Income Taxes [Line Items]
Effective Tax Rate	(6.00%)	5.00%	(20.00%)	(12.00%)
Period specific items benefit	$ (3,719)	$ (359)	$ (8,770)	$ (2,281)

- 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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