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 04, 2019	May 05, 2018
Funded Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11,049	$ 11,613
Interest cost	12,990	13,965
Expected return on plan assets	(18,488)	(20,962)
Recognized actuarial losses	4,509	3,114
Total expense	10,060	7,730
Unfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	552	611
Interest cost	967	853
Expected return on plan assets	0	0
Recognized actuarial losses	936	821
Total expense	$ 2,455	$ 2,285