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Summary of Business and Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Opening Balance $ (15,986)    
Closing Balance (13,980) (15,986)  
Expected return on plan assets (391)    
Actuarial losses (gains) 1,003    
Amortization of net actuarial loss 1,548    
Pension adjustments 924    
Total before tax 3,084    
Tax effect (1,078)    
Net of tax 2,006 (658) (5,586)
Pension Plan, Defined Benefit [Member]
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from AOCI, net of tax 2,006    
Amortization of prior service cost (credit) 0 0  
Expected return on plan assets 1,119 979  
Actuarial losses (gains) 596 3,951  
Amortization of net actuarial loss 2,264 2,184  
Accumulated Other Comprehensive Loss
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Opening Balance (15,986)    
Closing Balance (13,980) (15,986)  
Net of tax $ 2,006 $ (658) $ (5,586)