Summary of Significant Accounting Policies - Calculation of EPS and Reconciliation of Weighted Average Common Shares Used in Calculation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2017	Sep. 30, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Numerator:
Net income	$ 20,293	$ 6,292	$ 10,255	$ 2,999	$ 4,122	$ 10,796	$ 7,350	$ 1,479	$ 39,839	$ 23,747	$ 23,552
Denominator:
Weighted-average common shares-Basic									49,522	48,856	48,272
Add: Dilutive effect of stock compensation plans									2,206	1,723	2,096
Weighted-average common shares-Diluted									51,728	50,579	50,368
Net income per common share:
Basic	$ 0.41	$ 0.13	$ 0.21	$ 0.06	$ 0.08	$ 0.22	$ 0.15	$ 0.03	$ 0.80	$ 0.49	$ 0.49
Diluted	$ 0.39	$ 0.12	$ 0.20	$ 0.06	$ 0.08	$ 0.21	$ 0.15	$ 0.03	$ 0.77	$ 0.47	$ 0.47