Business Segments and Significant Customers - Net Revenues from External Customers (Details) - USD ($)	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Business segments revenue by products
Net revenues from external customers	$ 63,365,000	$ 66,529,000	$ 69,263,000	$ 69,855,000	$ 68,664,000	$ 69,865,000	$ 66,422,000	$ 77,607,000	$ 73,746,000.000	$ 72,556,000.000	$ 71,852,000.000	$ 67,509,000.000	$ 269,012,000	$ 282,558,000	$ 285,663,000
Percentage of net revenue													100.00%	100.00%	100.00%
Frozen Products
Business segments revenue by products
Net revenues from external customers													$ 160,550,000	$ 167,166,000	$ 179,518,000
Percentage of net revenue													59.70%	59.20%	62.80%
Frozen Products | Berries Beverage Blends and Desserts Product
Business segments revenue by products
Net revenues from external customers													$ 112,099,000	$ 121,632,000	$ 118,473,000
Percentage of net revenue													41.70%	43.10%	41.50%
Frozen Products | Vegetables Product
Business segments revenue by products
Net revenues from external customers													$ 48,451,000	$ 45,534,000	$ 61,045,000
Percentage of net revenue													18.00%	16.10%	21.30%
Snack Products
Business segments revenue by products
Net revenues from external customers													$ 108,462,000	$ 115,392,000	$ 106,145,000
Percentage of net revenue													40.30%	40.80%	37.20%
Snack Products | Indulgent Specialty Snacks Product
Business segments revenue by products
Net revenues from external customers													$ 38,187,000	$ 44,482,000	$ 49,091,000
Percentage of net revenue													14.20%	15.70%	17.20%
Snack Products | Healthy Natural Snacks Product
Business segments revenue by products
Net revenues from external customers													$ 70,275,000	$ 70,910,000	$ 57,054,000
Percentage of net revenue													26.10%	25.10%	20.00%