Acquisition of Kurbo Health, Inc. - Additional Information (Detail) - USD ($) $ in Thousands	Aug. 10, 2018	Sep. 28, 2019	Dec. 29, 2018
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, goodwill		$ 152,806	$ 152,519
Kurbo Health, Inc.
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, net purchase price	$ 3,063
Business acquisition, purchase price allocation, goodwill	1,101	$ 152,806	$ 152,519
Business acquisition, purchase price allocation, prepaid expenses	78
Business acquisition, purchase price allocation, other assets	32
Business acquisition, purchase price allocation, deferred revenue	57
Business acquisition, purchase price allocation, other liabilities	7
Kurbo Health, Inc. | Website Development
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, finite lived intangible assets	$ 1,916