Disclosure of costs incurred under the Value Creation Plan (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 30, 2019	Mar. 31, 2018
Restructuring Reserve [Roll Forward]
Cost of goods sold		$ 277,069	$ 278,968
Selling, general and administrative expenses		26,248	28,288
Value Creation Plan [Member]
Restructuring Reserve [Roll Forward]
Balance payable (receivable), Beginning		913	3,727
Costs incurred and charged to expense		1,858	2,195
Cash receipts (payments), net		(1,849)	(2,293)
Non-cash adjustments		2,102	(339)
Balance payable, Ending		3,024	3,290
Costs incurred and charged to expense to date		72,470
Cash payments, net to date		(47,474)
Non-cash adjustments to date		(21,972)
Cost of goods sold	[1]	0	100
Selling, general and administrative expenses	[2]	203	313
Other Expense	[3]	1,655	1,782
Value Creation Plan [Member] | Asset impairments and facility closure costs [Member]
Restructuring Reserve [Roll Forward]
Balance payable (receivable), Beginning	[4]	477	(700)
Costs incurred and charged to expense	[4]	256	1,650
Cash receipts (payments), net	[4]	(381)	700
Non-cash adjustments	[4]	0	(339)
Balance payable, Ending		352	1,311	[4]
Costs incurred and charged to expense to date		34,908
Cash payments, net to date		(10,059)
Non-cash adjustments to date		(24,497)
Value Creation Plan [Member] | Employee recruitment, retention and termination costs [Member]
Restructuring Reserve [Roll Forward]
Balance payable (receivable), Beginning	[5]	436	4,427
Costs incurred and charged to expense	[5]	1,508	435
Cash receipts (payments), net	[5]	(1,374)	(2,883)
Non-cash adjustments	[5]	2,102	0
Balance payable, Ending		2,672	1,979	[5]
Costs incurred and charged to expense to date		16,489
Cash payments, net to date		(16,342)
Non-cash adjustments to date		2,525
Value Creation Plan [Member] | Consulting fees and temporary labor costs [Member]
Restructuring Reserve [Roll Forward]
Balance payable (receivable), Beginning		0	0
Costs incurred and charged to expense		94	110
Cash receipts (payments), net		(94)	(110)
Non-cash adjustments			0
Balance payable, Ending		0	$ 0
Costs incurred and charged to expense to date		21,073
Cash payments, net to date		(21,073)
Non-cash adjustments to date		$ 0

[1] For the quarter ended March 31, 2018, inventory write-downs and facility closure costs recorded in cost of goods sold were allocated to the Consumer Products operating segment.

[2] Professional fees and employee retention and recruitment costs recorded in selling general and administrative expenses were allocated to Corporate Services.

[3] For the quarter ended March 30, 2019, employee termination, recruitment and relocation costs, net of the reversal of stock-based compensation, and facility closure costs recorded in other expense were allocated as follows: Global Ingredients reportable segment - $0.2 million (March 31, 2018 - $0.3 million); Consumer Products operating segment - $0.8 million (March 31, 2018 - $1.3 million); and Corporate Services - $0.7 million (March 31, 2018 - $0.1 million).

[4] Asset impairments and facility closure costs

[5] Employee recruitment, retention and termination costs