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Benefit Plans (Details) (USD $)
3 Months Ended 9 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Oct. 29, 2011
Benefit Plans        
Employer contribution to pension plan $ 1,200,000   $ 3,300,000  
Expected employer contribution to pension plan for remainder of current fiscal year 1,100,000   1,100,000  
Components of net periodic benefit costs:        
Service cost 817,000 831,000 2,450,000 2,494,000
Interest cost 1,823,000 1,800,000 5,470,000 5,400,000
Net actuarial loss 1,283,000 492,000 3,849,000 1,475,000
Amortization of prior service cost 157,000 157,000 470,000 470,000
Net periodic benefit costs $ 4,080,000 $ 3,280,000 $ 12,239,000 $ 9,839,000