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Components of Receivables (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Jan. 02, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables and other $ 15,167 $ 11,939
Unbilled costs and accrued profits 2,280 371
Less: allowance for doubtful accounts 0 0
Trade and other accounts receivable, net of allowances of $0 at both December 31, 2016 and January 2, 2016 $ 17,447 $ 12,310