Consolidated Statements of Cash Flows (unaudited) (USD $)	9 Months Ended
	Sep. 24, 2013	Sep. 25, 2012
Cash flows from operations:
Net income	$ 141,921,000	$ 121,836,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	75,961,000	67,290,000
Stock-based compensation expense	7,841,000	6,596,000
Excess tax benefit from exercise of stock options	(7,818,000)	(7,251,000)
Deferred income taxes	7,991,000	(2,984,000)
Other	3,538,000	1,951,000
Changes in operating assets and liabilities, excluding the effect of acquisitions and dispositions:
Trade and other accounts receivable, net	2,241,000	2,294,000
Inventories	299,000	(430,000)
Prepaid expenses and other	4,920,000	(12,363,000)
Deposits and other	1,005,000	90,000
Accounts payable	425,000	(8,059,000)
Accrued expenses	(26,741,000)	47,336,000
Deferred rent	3,464,000	4,096,000
Other long-term liabilities	(3,536,000)	(916,000)
Net cash provided by operating activities	211,511,000	219,486,000
Cash flows from investing activities:
Additions to property and equipment	(124,334,000)	(105,285,000)
Acquisitions, net of cash acquired	(2,446,000)	(47,951,000)
Proceeds from sale-leaseback transactions	2,085,000	0
Purchases of investments	(97,919,000)	0
Proceeds from Sale, Maturity and Collection of Investments	97,936,000	0
Net cash used in investing activities	(124,678,000)	(153,236,000)
Cash flows from financing activities:
Repurchase of common stock	(200,465,000)	(11,326,000)
Exercise of employee stock options	456,000	3,204,000
Excess tax benefit from exercise of stock options	7,818,000	7,251,000
Proceeds from issuance of common stock under employee benefit plans	2,178,000	1,865,000
Net cash provided by (used in) financing activities	(190,013,000)	994,000
Net increase (decrease) in cash and cash equivalents	(103,180,000)	67,244,000
Cash and cash equivalents at beginning of period	297,141,000	222,640,000
Cash and cash equivalents at end of period	$ 193,961,000	$ 289,884,000