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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Balance, value at Dec. 29, 2018	$ 715,947	$ 484,064	$ (15,759)	$ 247,642
Balance, shares at Dec. 29, 2018		35,952
Impact of adoption of new standard | (ASU 2016-02) [Member]	(26,863)			(26,863)
Net earnings	7,469			7,469
Other comprehensive income	60		60
Dividends	(6,902)			(6,902)
Stock-based employee compensation	5,383	$ 5,383
Issuances of common stock for stock bonus plan and associate stock purchase plan	452	$ 452
Issuance of common stock and related tax benefit on stock option exercises, stock bonus plan and associate stock purchase plan, shares		30
Issuances of restricted stock, shares		444
Cancellations of stock-based awards, value	(1,744)	$ (1,744)
Cancellations of stock-based awards, shares		(107)
Balance, value at Apr. 20, 2019	693,802	$ 488,155	(15,699)	221,346
Balance, shares at Apr. 20, 2019		36,319
Balance, value at Dec. 28, 2019	$ 687,538	$ 490,233	(1,600)	198,905
Balance, shares at Dec. 28, 2019	36,351	36,351
Impact of adoption of new standard | (ASU 2016-13) [Member]	$ (1,612)			(1,612)
Net earnings	15,402			15,402
Other comprehensive income	80		80
Dividends	(6,997)			(6,997)
Share repurchase, value	(10,000)	$ (10,000)
Share repurchase, shares		(861)
Stock-based employee compensation	2,342	$ 2,342
Issuances of common stock for stock bonus plan and associate stock purchase plan	291	$ 291
Issuance of common stock and related tax benefit on stock option exercises, stock bonus plan and associate stock purchase plan, shares		21
Issuances of restricted stock, shares		293
Cancellations of stock-based awards, value	(1,352)	$ (1,352)
Cancellations of stock-based awards, shares		(122)
Balance, value at Apr. 18, 2020	$ 685,692	$ 481,514	$ (1,520)	$ 205,698
Balance, shares at Apr. 18, 2020	35,682	35,682

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