CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Dividend Declared	Dividend Paid	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Dividend Declared	Retained Earnings Dividend Paid	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interest
Beginning Balance at Dec. 30, 2017	$ 514,577				$ 43,354	$ 7,029	$ 467,296				$ (3,611)	$ 509
Comprehensive income:
Net income (loss)	93,326						93,377					(51)
Other comprehensive income (loss), net of tax	12										12
Change in ownership of non-controlling interest	(175)						(43)					(132)
Cash dividends	(51,085)						(51,085)
Common shares – treasury:
Shares purchased	(29,424)				(755)	(24,033)	(4,636)
Shares issued under Members' Stock Purchase Plan and stock awards, net of tax	36,028				983	35,045
Ending Balance at Dec. 29, 2018	563,259				43,582	18,041	504,909				(3,599)	326
Ending Balance (Impact of Implementation of Lease Guidance) at Dec. 29, 2018				$ 2,999						$ 2,999
Comprehensive income:
Net income (loss)	110,503						110,505					(2)
Other comprehensive income (loss), net of tax	(3,735)										(3,735)
Reclassification of Stranded Tax Effects (ASU 2018-02)	0						739				(739)
Cash dividends	(52,232)						(52,232)
Common shares – treasury:
Shares purchased	(83,907)				(2,286)	(44,424)	(37,197)
Shares issued under Members' Stock Purchase Plan and stock awards, net of tax	47,481				1,299	46,182
Ending Balance at Dec. 28, 2019	584,368			$ (131)	42,595	19,799	529,723			$ (131)	(8,073)	324
Comprehensive income:
Net income (loss)	41,919						41,917					2
Other comprehensive income (loss), net of tax	$ (1,080)										(1,080)
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Cash dividends		$ (231)	$ (52,096)					$ (231)	$ (52,096)
Common shares – treasury:
Shares purchased	$ (6,390)				(214)	(4,988)	(1,188)
Shares issued under Members' Stock Purchase Plan and stock awards, net of tax	24,386				538	23,848
Ending Balance at Jan. 02, 2021	$ 590,745				$ 42,919	$ 38,659	$ 517,994				$ (9,153)	$ 326