Per Share Amounts and Common Shares Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Equity [Abstract]
Net (loss) income	$ (2,275)	$ 5,996
Weighted-average shares outstanding, basic	41,517,000	42,747,000
Weighted-average shares, partially-paid share subscriptions	315,000	330,000
Basic weighted average shares	41,832,000	43,077,000
Incremental shares from assumed exercise of stock subscription purchase rights	0	5,000
Incremental shares from assumed exercise of stock options and awards	0	2,040,000
Diluted weighted-average shares	41,832,000	45,122,000
Net income per share basic	$ (0.05)	$ 0.14
Net income per share diluted	$ (0.05)	$ 0.13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding at January 1, 2024	41,347,394
Shares purchased	(384,581)
Shares sold	165,385
Options and awards exercised	376,296
Shares outstanding at March 30, 2024	41,504,494
Employee options exercisable	1,498,678
Common stock, shares subscribed but unissued	1,259,250
Purchase rights, outstanding	455,754
Share-Based Payment Arrangement
Equity [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,802,000	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,802,000	0
Stock subscription rights
Equity [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	72,000	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	72,000	0
Common shares, net of treasury shares [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding at January 1, 2024	32,848,308
Shares purchased	(365,026)
Shares sold	32
Options and awards exercised	376,296
Shares outstanding at March 30, 2024	32,859,610
Redeemable shares [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding at January 1, 2024	8,499,086
Shares purchased	(19,555)
Shares sold	165,353
Options and awards exercised	0
Shares outstanding at March 30, 2024	8,644,884
Stock option plans [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee options exercisable	1,498,678