Summary of Total Cost and Employer Contributions (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Oct. 05, 2019	Oct. 06, 2018	Oct. 05, 2019	Oct. 06, 2018
401(k) Retirement Savings Plans
Defined Benefit Plan Disclosure [Line Items]
Total cost and employer contributions	$ 6,264	$ 6,013	$ 21,137	$ 19,600

Amount of cost for defined contribution plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration