Financial Information Related to Funded Defined Benefit Pension Plan and Unfunded Supplemental Pension Plan (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2017	Oct. 29, 2016	Oct. 28, 2017	Oct. 29, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension settlement charge		$ 31,173		$ 31,173
Funded Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11,655	11,360	$ 35,264	33,778
Interest cost	13,866	14,023	41,384	42,747
Expected return on plan assets	(17,309)	(17,633)	(52,073)	(53,503)
Recognized actuarial losses	5,428	7,943	16,582	22,362
Expense related to current period	13,640	15,693	41,157	45,384
Pension settlement charge		31,173		31,173
Total expense	13,640	46,866	41,157	76,557
Unfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	403	293	1,578	1,376
Interest cost	820	793	2,506	2,543
Recognized actuarial losses	641	783	2,305	2,512
Expense related to current period	1,864	1,869	6,389	6,431
Total expense	$ 1,864	$ 1,869	$ 6,389	$ 6,431