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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 9 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Oct. 29, 2011
Correction of Prior Years Pension Accruals
        
Defined Benefit Plan Disclosure [Line Items]        
Total expense $ 22,300   $ 22,300  
Pension Funded Plan
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 11,709 8,893 31,359 25,393
Interest cost 10,856 10,019 31,381 28,925
Expected return on plan assets (13,216) (12,275) (41,068) (36,794)
Recognized actuarial losses 4,926 3,515 19,121 8,141
Total expense 36,592 10,152 63,110 25,665
Pension Funded Plan | Expense Related to Current Period
        
Defined Benefit Plan Disclosure [Line Items]        
Total expense 14,275 10,152 40,793 25,665
Pension Funded Plan | Correction of Prior Years Pension Accruals
        
Defined Benefit Plan Disclosure [Line Items]        
Total expense 22,317   22,317  
Pension Unfunded Plan
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 407 359 1,086 892
Interest cost 609 558 1,749 1,807
Amortization of prior service cost 1 1 2 3
Recognized actuarial losses 894 86 1,844 500
Total expense 1,911 1,004 4,681 3,202
Pension Unfunded Plan | Expense Related to Current Period
        
Defined Benefit Plan Disclosure [Line Items]        
Total expense $ 1,911 $ 1,004 $ 4,681 $ 3,202