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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, 2015	Jan. 31, 2014	Jan. 31, 2013
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Currently payable	$ 12,663us-gaap_CurrentIncomeTaxExpenseBenefit	$ 20,098us-gaap_CurrentIncomeTaxExpenseBenefit	$ 26,894us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred expense (benefit)	(958)us-gaap_DeferredIncomeTaxExpenseBenefit	623us-gaap_DeferredIncomeTaxExpenseBenefit	(1,803)us-gaap_DeferredIncomeTaxExpenseBenefit
Income taxes	$ 11,705us-gaap_IncomeTaxExpenseBenefit	$ 20,721us-gaap_IncomeTaxExpenseBenefit	$ 25,091us-gaap_IncomeTaxExpenseBenefit

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.