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Financial Information Related to Funded Defined Benefit Pension Plan and Unfunded Supplemental Retirement Plan (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 01, 2015
Aug. 02, 2014
Aug. 01, 2015
Aug. 02, 2014
Funded Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 13,053 $ 10,123 $ 26,108 $ 20,246
Interest cost 12,949 12,297 25,898 24,594
Expected return on plan assets (19,493) (16,302) (38,986) (32,605)
Recognized actuarial losses 8,547 3,256 17,094 6,513
Total expense 15,056 9,374 30,114 18,748
Unfunded Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 694 449 1,387 899
Interest cost 871 694 1,742 1,388
Amortization of prior service cost       1
Recognized actuarial losses 1,379 306 2,758 609
Total expense $ 2,944 $ 1,449 $ 5,887 $ 2,897