Operations in Different Geographic Areas (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 29, 2023	Dec. 30, 2022	Dec. 31, 2021
Operations in Different Geographic Areas [Line Items]
Property, equipment and leasehold improvements, net		$ 75,318	$ 65,539
Revenues	[1]	536,766	513,293	$ 466,269
United States
Operations in Different Geographic Areas [Line Items]
Property, equipment and leasehold improvements, net		74,668	64,742
Revenues	[1]	470,078	450,445	397,001
Foreign Countries
Operations in Different Geographic Areas [Line Items]
Property, equipment and leasehold improvements, net		650	797
Revenues	[1]	$ 66,688	$ 62,848	$ 69,268

[1] Geographic revenues are allocated based on the location of the client.