Supplemental Cash Flow Information (Disclosure of supplemental cash flow information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Changes in Operating Assets and Liabilities
Accounts receivable	$ 13,348	$ 14,416	$ 1,742	$ (1,019)
Inventories	(20,195)	(43,924)	(13,705)	(42,121)
Accounts payable and accrued liabilities	19,887	13,571	17,300	27,386
Other operating assets and liabilities	(259)	(6,515)	(116)	(3,507)
Changes in operating assets and liabilities, total	12,781	(22,452)	5,221	(19,261)
Non-Cash Investing and Financing Activities
Change in additions to property, plant and equipment included in accounts payable and accrued liabilities	472	337	(680)	(5,439)
Change in accrued withholding taxes on stock-based awards included in accounts payable and accrued liabilities	(8,477)	0	0	0
Change in accrued dividends on preferred stock included in accounts payable and accrued liabilities	0	0	(305)	0
Change in proceeds receivable from sale of sunflower business	0	0	385	0
Change in accounts payable and accrued liabilities related to discontinued operations	$ 0	$ (6,324)	$ 0	$ 0