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Income Taxes - Significant components of the company's income tax provision (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Currently payable	$ 20,098	$ 26,894	$ 19,705
Deferred expense (benefit)	623	(1,803)	5,358
Income taxes	$ 20,721	$ 25,091	$ 25,063

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.