Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Income Statement [Abstract]
Net sales	$ 511,081	$ 458,550	$ 389,810
Cost of sales	352,097	318,452	270,678
Gross profit	158,984	140,098	119,132
Selling, general and administrative expenses	98,803	83,995	68,190
Fair value adjustment to contingent consideration		(3,000)
Income from operations	60,181	59,103	50,942
Interest expense, net	20,279	20,125	11,705
Debt extinguishment costs		3,431
Other expense, net			388
Income before income taxes	39,902	35,547	38,849
Income tax expense	63	11,800	15,297
Net income	$ 39,839	$ 23,747	$ 23,552
Net income per common share:
Basic	$ 0.80	$ 0.49	$ 0.49
Diluted	$ 0.77	$ 0.47	$ 0.47
Weighted average shares outstanding:
Basic	49,522	48,856	48,272
Diluted	51,728	50,579	50,368