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Pension Plans and Other Retirement Benefits - Financial Information Related to Funded Defined Benefit Pension Plan and Unfunded Supplemental Pension Plan (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2020
Nov. 02, 2019
Oct. 31, 2020
Nov. 02, 2019
Funded Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 12,512 $ 11,415 $ 37,592 $ 33,513
Interest cost 12,620 13,149 37,658 39,129
Expected return on plan assets (22,264) (18,630) (66,748) (55,606)
Amortization of net actuarial loss and prior service cost 6,028 5,556 17,046 14,574
Total expense 8,896 11,490 25,548 31,610
Unfunded Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 404 440 1,822 1,544
Interest cost 860 871 2,462 2,805
Expected return on plan assets 0 0 0 0
Amortization of net actuarial loss and prior service cost 1,394 471 3,462 2,343
Total expense $ 2,658 $ 1,782 $ 7,746 $ 6,692