Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Mar. 29, 2019	Jan. 29, 2019	Dec. 28, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for contract losses and doubtful accounts	$ (4,713)		$ (4,066)
Total accounts receivable, net	118,864	$ 6,000	105,814
Billed accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	78,814		73,905
Unbilled accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable	$ 44,763		$ 35,975