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		6 Months Ended
	Aug. 04, 2018	Jul. 29, 2017	Aug. 04, 2018	Jul. 29, 2017
Funded Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11,613	$ 11,804	$ 23,226	$ 23,609
Interest cost	13,965	13,759	27,930	27,518
Expected return on plan assets	(20,962)	(17,382)	(41,924)	(34,764)
Recognized actuarial losses	3,114	5,574	6,228	11,154
Total expense	7,730	13,755	15,460	27,517
Unfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	2,500		2,500
Service cost	611	587	1,222	1,175
Interest cost	853	843	1,706	1,686
Expected return on plan assets	0	0	0	0
Recognized actuarial losses	821	833	1,642	1,664
Total expense	$ 2,285	$ 2,263	$ 4,570	$ 4,525