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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, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Effective Tax Rate and Period specific Income Tax Expense (Benefit)
Effective Tax Rate	(19.00%)	(487.00%)	(5.00%)	297.00%
Period specific items benefit			$ (5,245)

- 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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