Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Jan. 03, 2020	Dec. 28, 2018
Accounts Notes And Loans Receivable [Line Items]
Allowance for contract losses and doubtful accounts	$ (4,295)	$ (4,066)
Total accounts receivable, net	120,138	105,814
Billed accounts receivable
Accounts Notes And Loans Receivable [Line Items]
Accounts Receivable	85,579	73,905
Unbilled accounts receivable
Accounts Notes And Loans Receivable [Line Items]
Accounts Receivable	$ 38,854	$ 35,975