Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 30, 2014	Dec. 31, 2013	Dec. 25, 2012
Cash flows from operations:
Net Income	$ 179,293,000	$ 196,169,000	$ 173,448,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	124,109,000	106,523,000	90,939,000
Stock-based compensation expense	10,077,000	10,703,000	9,094,000
Tax benefit from exercise of stock options	(3,089,000)	(8,100,000)	(8,587,000)
Deferred income taxes	10,459,000	10,356,000	20,334,000
Loss on disposals of property and equipment	1,547,000	5,764,000	3,995,000
Other	3,070,000	589,000	475,000
Changes in operating assets and liabilities, excluding the effect of acquisitions:
Trade and other accounts receivable, net	(22,139,000)	3,021,000	(31,414,000)
Inventories	(895,000)	(2,186,000)	(2,440,000)
Prepaid expenses	(8,524,000)	(841,000)	(10,995,000)
Deposits and other	239,000	1,449,000	161,000
Accounts payable	1,978,000	8,162,000	(6,513,000)
Accrued expenses	35,288,000	13,372,000	49,246,000
Deferred rent	1,067,000	5,868,000	5,718,000
Other long-term liabilities	2,599,000	(2,432,000)	(4,005,000)
Net cash provided by operating activities	335,079,000	348,417,000	289,456,000
Cash flows from investing activities:
Additions to property and equipment	(224,217,000)	(192,010,000)	(152,328,000)
Acquisitions, net of cash acquired	0	(2,446,000)	(47,951,000)
Purchase of investments	0	97,919,000	0
Proceeds from sale of investments	0	97,936,000	0
Proceeds from sale-leaseback transactions	12,900,000	6,132,000	4,538,000
Net cash used in investing activities	(211,317,000)	(188,307,000)	(195,741,000)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt	100,000,000	0	0
Debt Issuance Cost	(193,000)	0	(1,097,000)
Repurchase of common stock	(159,503,000)	(339,409,000)	(31,566,000)
Exercise of employee stock options	1,116,000	573,000	4,455,000
Tax benefit from exercise of stock options	3,089,000	8,100,000	8,587,000
Proceeds from issuance of common stock under employee benefit plans	3,247,000	2,842,000	2,462,000
Payment of Deferred Acquisition Holdback	(270,000)	(4,112,000)	(2,055,000)
Net cash (used in) provided by financing activities	(52,514,000)	(332,006,000)	(19,214,000)
Net (decrease) increase in cash and cash equivalents	71,248,000	(171,896,000)	74,501,000
Cash and Cash Equivalents, at Carrying Value	125,245,000	297,141,000	222,640,000
Cash and Cash Equivalents, at Carrying Value	$ 196,493,000	$ 125,245,000	$ 297,141,000