CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income	Retained Earnings
Shares, Outstanding		136,382
Stockholders' equity at Dec. 27, 2014	$ 1,293,561	$ 1,342	$ 510,997	$ (1,137,085)	$ 0	$ 1,918,307
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under employee stock purchase plan	4,710	$ 1	4,709
Issuance of common stock under employee stock purchase plan, shares		68
Exercise of stock options and restricted stock units	36,979	$ 9	36,970
Exercise of stock options and restricted stock units, shares		1,190
Share-based compensation	19,420		19,420
Tax benefit of stock options exercised	27,032		27,032
Repurchase of shares to satisfy tax obligations	(2,997)
Repurchase of common stock, shares		(3,416)
Repurchase of common stock	(292,705)			(292,705)
Dividends paid	(103,101)					(103,101)
Net income	410,395					410,395
Stockholders' equity at Dec. 26, 2015	1,393,294	$ 1,352	596,131	(1,429,790)	0	2,225,601
Shares, Outstanding		134,224
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under employee stock purchase plan	4,809	$ 1	4,808
Issuance of common stock under employee stock purchase plan, shares		70
Exercise of stock options and restricted stock units	36,201	$ 7	36,194
Exercise of stock options and restricted stock units, shares		899
Share-based compensation	23,554		23,554
Tax benefit of stock options exercised	11,671		11,671
Repurchase of shares to satisfy tax obligations	(843)
Repurchase of common stock, shares		(4,398)
Repurchase of common stock	(331,708)			(331,708)
Dividends paid	(122,272)					(122,272)
Change in fair value of interest rate swap, net of taxes	1,392				1,392
Net income	437,120					437,120
Stockholders' equity at Dec. 31, 2016	1,453,218	$ 1,360	671,515	(1,761,498)	1,392	2,540,449
Shares, Outstanding		130,795
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under employee stock purchase plan	4,283	$ 1	4,282
Issuance of common stock under employee stock purchase plan, shares		83
Exercise of stock options and restricted stock units	12,047	$ 2	12,045
Exercise of stock options and restricted stock units, shares		349
Share-based compensation	29,202		29,202
Repurchase of shares to satisfy tax obligations	(816)
Repurchase of common stock, shares		(5,924)
Repurchase of common stock	(369,403)			(369,403)
Dividends paid	(133,828)					(133,828)
Change in fair value of interest rate swap, net of taxes	1,371				1,371
Net income	422,599					422,599
Stockholders' equity at Dec. 30, 2017	$ 1,418,673	$ 1,363	$ 716,228	$ (2,130,901)	$ 2,763	$ 2,829,220
Shares, Outstanding		125,303