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
	May 02, 2020	May 04, 2019
Funded Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 12,540	$ 11,049
Interest cost	12,519	12,990
Expected return on plan assets	(22,242)	(18,488)
Amortization of net actuarial loss and prior service cost	5,509	4,509
Total expense	8,326	10,060
Unfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	709	552
Interest cost	801	967
Expected return on plan assets	0	0
Amortization of net actuarial loss and prior service cost	1,034	936
Total expense	$ 2,544	$ 2,455