Segmented information (Narrative) (Details)	12 Months Ended
Dec. 29, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]
Description Of Effect On Previously Reported Segment Information For Change In Composition Of Reportable Segments	In 2018, the Company transferred certain of its specialty ingredient operations from the Raw Material Sourcing and Supply operating segment to the Healthy Beverages platform of the Consumer Products operating segment. This realignment reflects a change in commercial responsibilities for these operations and resulting changes in reporting and accountability to the Company’s Chief Executive Officer. These operations produce liquid bases, including for the Company’s non-dairy aseptic beverage operations, as well as spray-dried ingredients. The segment information presented below for years ended December 30, 2017 and December 31, 2016 has been restated to reflect this realignment. Specifically, for the years ended December 30, 2017 and December 31, 2016, revenues of $13.6 million and $15.5 million, respectively, and operating income of $2.0 million and $2.0 million, respectively, generated by these operations have been reclassified from Global Ingredients to Consumer Products.
Segment Reporting Disclosure Of Major Customers	1

Disclosure of the extent of enterprise reliance on its major customers. For example, includes revenues from transactions with a single external customer amounting to 10 percent or more of the entity's revenues, the total amount of revenues from each such customer, and the identity of the segment or segments reporting the revenues. A group of entities that the entity knows to be under common control generally will be considered a single customer for inclusion in this item. The federal government, a state government, a local government (for example, a county or municipality), or a foreign government each will generally be considered as a single customer for inclusion in this item.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9054-108599

Name:	us-gaap_SegmentReportingDisclosureOfMajorCustomers
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration