Income Taxes Significant Components of Deferred Income Tax Provision (Benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Schedule Of Components of Deferred Tax Provision [Line Items]
Net changes in gross deferred tax assets and liabilities	$ (8,331)	$ (10,491)	$ (20,381)
Deferred tax assets increasing goodwill	2	(1,747)	(5,618)
Deferred tax assets reducing/(increasing) equity	(283)	36	(1,178)
Deferred tax assets increasing deferred charge and other liabilities	(87)	(1,690)	(305)
Increase in beginning-of-year balance of the valuation allowance for deferred tax assets	6,711	14,948	22,458
Deferred Income Tax Expense (Benefit)	$ (1,988)	$ 1,056	$ (5,024)