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Reconciliation of Basic and Diluted Net Income Per Share Computations and Number of Dilutive Equity Awards Included in Dilutive Net Income Per Share Computation (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2018	Oct. 03, 2017	Oct. 02, 2018	Oct. 03, 2017
Earnings Per Share [Abstract]
Net income	$ 8,516	$ 2,389	$ 40,125	$ 21,294
Weighted-average shares outstanding – basic	21,118	21,354	20,861	21,620
Dilutive effect of equity awards	689	316	639	412
Weighted-average shares outstanding – diluted	21,807	21,670	21,500	22,032

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.