Financial Information Related to Funded Defined Benefit Pension Plan and Unfunded Supplemental Pension Plan (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016
Funded Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 11,804	$ 11,209	$ 23,609	$ 22,418
Interest cost	13,759	14,362	27,518	28,724
Expected return on plan assets	(17,382)	(17,935)	(34,764)	(35,870)
Recognized actuarial losses	5,574	7,210	11,154	14,419
Total expense	13,755	14,846	27,517	29,691
Unfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	587	542	1,175	1,083
Interest cost	843	875	1,686	1,750
Recognized actuarial losses	833	864	1,664	1,729
Total expense	$ 2,263	$ 2,281	$ 4,525	$ 4,562