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Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 29, 2016
Oct. 31, 2015
Oct. 29, 2016
Oct. 31, 2015
Defined Benefit Plan Disclosure [Line Items]        
Pension settlement charge $ 31,173   $ 31,173  
Funded Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 11,360 $ 11,453 33,778 $ 37,561
Interest cost 14,023 12,885 42,747 38,783
Expected return on plan assets (17,633) (19,546) (53,503) (58,532)
Recognized actuarial losses 7,943 8,048 22,362 25,142
Expense related to current period 15,693 12,840 45,384 42,954
Pension settlement charge 31,173   31,173  
Total expense 46,866 12,840 76,557 42,954
Unfunded Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 293 (215) 1,376 1,172
Interest cost 793 533 2,543 2,275
Recognized actuarial losses 783 211 2,512 2,969
Expense related to current period 1,869 529 6,431 6,416
Total expense $ 1,869 $ 529 $ 6,431 $ 6,416