Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 27, 2011	Dec. 28, 2010
Current assets:
Cash and cash equivalents	$ 222,640	$ 229,299
Trade accounts receivable, net	30,700	20,378
Other accounts receivable	24,009	17,962
Inventories	17,016	14,345
Prepaid expenses	31,228	23,905
Deferred income taxes	27,526	24,796
Total current assets	353,119	330,685
Property and equipment, net	492,022	444,094
Other assets:
Goodwill	108,071	94,442
Other intangible assets, net	67,269	48,402
Deposits and other	6,841	6,958
Total other assets	182,181	149,802
Total assets	1,027,322	924,581
Current liabilities:
Accounts payable	15,884	7,346
Accrued expenses	222,450	204,170
Total current liabilities	238,334	211,516
Deferred rent	54,055	47,974
Deferred income taxes	34,345	30,264
Other long-term liabilities	45,512	39,219
Total liabilities	372,246	328,973
Common stock, $.0001 par value:
Total Equity	655,076	595,608
Total Equity and Liabilities	1,027,322	924,581
Common Stock [Member] | Common Stock Class A [Member]
Common stock, $.0001 par value:
Total Equity	3	3
Common Stock [Member] | Common Stock Class B [Member]
Common stock, $.0001 par value:
Total Equity	0	0
Common Stock Class A [Member] | Common Stock Class A [Member]
Common stock, $.0001 par value:
Common Stock	3	3
Common Stock Class B [Member] | Common Stock Class B [Member]
Common stock, $.0001 par value:
Common Stock	0	0
Treasury Stock [Member]
Common stock, $.0001 par value:
Treasury stock, carried at cost; 2,048,338 shares at December 27,2011 and 1,119,092 shares at December 28, 2010	(175,595)	(78,990)
Total Equity	(175,595)	(78,990)
Preferred Stock [Member]
Common stock, $.0001 par value:
Preferred Stock, Value, Outstanding	0	0
Additional Paid-in Capital [Member]
Common stock, $.0001 par value:
Additional paid-in capital	150,093	130,005
Total Equity	150,093	130,005
Accumulated Other Comprehensive Income (Loss) [Member]
Common stock, $.0001 par value:
Accumulated other comprehensive income	308	275
Total Equity	308	275
Retained Earnings [Member]
Common stock, $.0001 par value:
Retained earnings	680,267	544,315
Total Equity	$ 680,267	$ 544,315