Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 29, 2017	$ 723,063	$ 169,319	$ 499,934	$ 181,599	$ (127,789)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued	8,092	1,592	6,500	0	0
Shares repurchased	(155,601)	(3,502)	(10,340)	(141,759)	0
Stock compensation cost	18,321	0	18,321	0	0
Restricted stock cancelled (issued)	(772)	0	(772)	0	0
Net Earnings	267,331	0	0	267,331	0
Dividends declared	(66,725)	0	0	(66,725)	0
Reclassified to Retained Earnings from AOCI	0	0	0	15,453	(15,453)
Reclassified to Retained Earnings	(15,453)
Other comprehensive income (loss)	2,853	0	0	0	2,853
Ending Balance at Sep. 28, 2018	796,562	167,409	513,643	255,899	(140,389)
Beginning Balance at Jun. 29, 2018	711,805	167,130	505,342	185,407	(146,074)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued	3,419	279	3,140	0	0
Stock compensation cost	5,161	0	5,161	0	0
Net Earnings	92,681	0	0	92,681	0
Dividends declared	(22,189)	0	0	(22,189)	0
Other comprehensive income (loss)	5,685	0	0	0	5,685
Ending Balance at Sep. 28, 2018	796,562	167,409	513,643	255,899	(140,389)
Beginning Balance at Dec. 28, 2018	751,873	165,171	510,825	220,734	(144,857)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued	34,974	1,747	33,227	0	0
Shares repurchased	(2,683)	(60)	(186)	(2,437)	0
Stock compensation cost	19,700	0	19,700	0	0
Net Earnings	259,018	0	0	259,018	0
Dividends declared	(79,998)	0	0	(79,998)	0
Other comprehensive income (loss)	912	0	0	0	912
Ending Balance at Sep. 27, 2019	983,796	166,858	563,566	397,317	(143,945)
Beginning Balance at Jun. 28, 2019	925,958	166,792	556,170	342,308	(139,312)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued	2,289	126	2,163	0	0
Shares repurchased	(2,683)	(60)	(186)	(2,437)	0
Stock compensation cost	5,419	0	5,419	0	0
Net Earnings	84,132	0	0	84,132	0
Dividends declared	(26,686)	0	0	(26,686)	0
Other comprehensive income (loss)	(4,633)	0	0	0	(4,633)
Ending Balance at Sep. 27, 2019	$ 983,796	$ 166,858	$ 563,566	$ 397,317	$ (143,945)