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Financial Information Related to Funded Defined Benefit Retirement Plan And Unfunded Supplemental Pension Plan (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 28, 2012
Jul. 30, 2011
Jul. 28, 2012
Jul. 30, 2011
Pension Funded Plan
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 9,825 $ 8,250 $ 19,651 $ 16,500
Interest cost 10,263 9,453 20,525 18,906
Expected return on plan assets (13,926) (12,260) (27,853) (24,519)
Recognized actuarial losses 7,097 2,313 14,195 4,626
Total expense 13,259 7,756 26,518 15,513
Pension Unfunded Plan
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost 339 267 679 533
Interest cost 570 625 1,140 1,249
Amortization of prior service cost 1 1 2 2
Recognized actuarial losses 475 207 950 414
Total expense $ 1,385 $ 1,100 $ 2,771 $ 2,198