Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Jan. 01, 2021	Jan. 03, 2020
Accounts Notes And Loans Receivable [Line Items]
Allowance for contract losses and doubtful accounts	$ (3,995)	$ (4,295)
Total accounts receivable, net	111,565	120,138
Billed accounts receivable
Accounts Notes And Loans Receivable [Line Items]
Accounts Receivable	80,298	85,579
Unbilled accounts receivable
Accounts Notes And Loans Receivable [Line Items]
Accounts Receivable	$ 35,262	$ 38,854