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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Oct. 01, 2021	Jul. 02, 2021	Apr. 02, 2021	Sep. 25, 2020	Jun. 26, 2020	Mar. 27, 2020	Oct. 01, 2021	Sep. 25, 2020	Jan. 01, 2021
Equity, Class of Treasury Stock [Line Items]
Total cost	$ 2,103,000	$ 8,603,000	$ 2,110,000	$ 932,000		$ 1,006,000
Amount available under repurchase plan	11,500,000						$ 11,500,000
Stock repurchase authorized	$ 167,200,000						$ 167,200,000
Shares repurchased for employee net vesting obligations, shares	8			8			118	135
Shares repurchased for employee net vesting obligations, value	$ 155,000			$ 111,000			$ 1,800,000	$ 2,100,000
Dividend declared			$ 0.40
Dividend payment	$ 3,192,000	$ 3,227,000	$ 3,254,000	$ 3,024,000	$ 3,050,000	$ 13,000
Dividends payable, date declared, year	2021						2021
Dividends payable, date to be paid, year and month	2021-12						2021-12
Minimum [Member]
Equity, Class of Treasury Stock [Line Items]
Dividend declared									$ 0.36
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Dividend declared									$ 0.38
Share Repurchase Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock	113			75			738	148
Purchase price per share	$ 18.68			$ 12.41			$ 17.35	$ 13.09
Total cost	$ 2,100,000			$ 900,000			$ 12,800,000	$ 1,900,000
Stock Appreciation Rights ("SARs") [Member]
Equity, Class of Treasury Stock [Line Items]
SARs outstanding	2,900						2,900
Exercise price	$ 4.00						$ 4.00
Expiration date							Feb. 08, 2022

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