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Summary of Significant Accounting Policies - Changes in Product Warranty Accrual (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]      
Warranty accrual, beginning of period $ 1,416 $ 1,161 $ 838
Provision for warranty costs 800 1,144 1,560
Changes in pre-existing warranties (including changes in estimates) (61) (138) (52)
Settlements made (1,055) (1,027) (1,289)
Warranty accrual, end of period $ 1,222 $ 1,416 $ 1,161