Accounts Receivable, Net (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2012	Dec. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts	$ (2,668)	$ (2,339)
Total accounts receivable, net	88,355	73,065
Billed accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	51,880	50,338
Unbilled accounts receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 39,143	$ 25,066