XML 65 R64.htm IDEA: XBRL DOCUMENT

Effective Tax Rate and Period Specific Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Effective Tax Rate and Period specific Income Tax Expense (Benefit)
Effective Tax Rate	3.00%	(35.00%)
Period specific items benefit	$ (1,327)	$ (1,334)

- 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.

+ References+ Details