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Effective Tax Rate and Period Specific Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010
Income Taxes [Line Items]
Effective Tax Rate	(487.00%)	6.00%	297.00%	(4.00%)
Period specific items benefit	$ (3,717)	$ (2,275)	$ (5,052)	$ (1,922)

- 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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