Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Disaggregation Of Revenue [Line Items]
Segment revenues from external customers	$ 308,371	$ 320,713	$ 940,331	$ 987,198
Global Ingredients [Member]
Disaggregation Of Revenue [Line Items]
Segment revenues from external customers	136,754	137,254	419,770	410,022
Global Ingredients [Member] | Internationally-sourced organic ingredients [Member]
Disaggregation Of Revenue [Line Items]
Segment revenues from external customers	97,499	96,038	302,373	275,442
Global Ingredients [Member] | North American-sourced grains and seeds [Member]
Disaggregation Of Revenue [Line Items]
Segment revenues from external customers	39,255	41,216	117,397	134,580
Consumer Products [Member]
Disaggregation Of Revenue [Line Items]
Segment revenues from external customers	171,617	183,459	520,561	577,176
Consumer Products [Member] | Beverage products [Member]
Disaggregation Of Revenue [Line Items]
Segment revenues from external customers	76,530	71,678	242,329	232,203
Consumer Products [Member] | Frozen fruit products [Member]
Disaggregation Of Revenue [Line Items]
Segment revenues from external customers	80,446	88,768	240,052	274,172
Consumer Products [Member] | Snack products [Member]
Disaggregation Of Revenue [Line Items]
Segment revenues from external customers	$ 14,641	$ 23,013	$ 38,180	$ 70,801