Quarterly Results (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 23, 2016	Jun. 24, 2016	Mar. 25, 2016	Dec. 29, 2017	Dec. 30, 2016	Dec. 25, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 357,098	$ 325,076	$ 331,656	$ 287,690	$ 342,904	$ 297,917	$ 291,209	$ 260,836
Gross profit	91,973	80,905	82,596	73,904	89,064	74,392	71,803	65,958	$ 329,378	$ 301,217	$ 268,711
Operating profit	15,349	10,494	12,163	3,121	22,404	8,286	11,188	5,360	41,127	47,239	40,400
Income before income taxes	10,046	4,891	6,283	(2,812)	16,155	2,299	(14,479)	1,701	18,408	5,676	27,711
Net income	$ 9,483	$ 2,851	$ 3,674	$ (1,642)	$ 9,142	$ 1,343	$ (8,455)	$ 993	$ 14,366	$ 3,023	$ 16,209
Basic net income per share (in dollars per share)	$ 0.36	$ 0.11	$ 0.14	$ (0.06)	$ 0.35	$ 0.05	$ (0.33)	$ 0.04	$ 0.55	$ 0.12	$ 0.63
Diluted net income per share (in dollars per share)	$ 0.35	$ 0.11	$ 0.14	$ (0.06)	$ 0.34	$ 0.05	$ (0.33)	$ 0.04	$ 0.54	$ 0.12	$ 0.63
Business Acquisition [Line Items]
Tax benefit related to enactment of the Tax Act	$ 3,573								$ 3,573	$ 0	$ 0
Loss on debt extinguishment							$ 22,310		$ 0	$ 22,310	$ 0
Del Monte
Business Acquisition [Line Items]
Increase (decrease) in contingent consideration					$ (8,347)