Stock Based Compensation Stock Based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 27, 2011 years	Dec. 28, 2010 years	Dec. 29, 2009 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted stock (in shares)	566	569
Nonvested restricted stock, Weighted Average Grant Date Fair Value (in dollars per share)	$ 58.07	$ 50.52
Granted restricted stock (in shares)	132	160
Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 102.12	$ 76.22
Vested restricted stock in Period (in shares)	157	136
Vested in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 50.34	$ 48.84
Forfeited in Period (in shares)	39	27
Forfeited in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 66.43	$ 53.26
Nonvested restricted stock (in shares)	502	566
Nonvested restricted stock, Weighted Average Grant Date Fair Value (in dollars per share)	$ 71.47	$ 58.07
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ (428)	$ (575)	$ (821)
Allocated Share-based Compensation Expense, Net of Tax	694	935	1,333
Effect on earnings per share, basic (in dollars per share)	$ 0.02	$ 0.03	$ 0.04
Effect on earnings per share, diluted (in dollars per share)	$ 0.02	$ 0.03	$ 0.04
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding stock options (in shares)	216	814	1,452
Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 48.17	$ 44.04	$ 40.73
Options, Grants in Period (in shares)	4	4	7
Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)	$ 103.64	$ 67.94	$ 52.23
Exercise of employee stock options, Shares (in shares)	(65)	(598)	(627)
Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)	$ 49.37	$ 42.68	$ 36.39
Options, Exercises in Period, Total Intrinsic Value	4,703	20,867	13,115
Options, Forfeitures and Expirations in Period (in shares)	(6)	(4)	(18)
Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price (in dollars per share)	$ 49.14	$ 49.63	$ 46.91
Outstanding stock options (in shares)	149	216	814
Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 48.98	$ 48.17	$ 44.04
Options, Outstanding, Weighted Average Remaining Contractual Term (in years)	1.9
Options, Outstanding, Intrinsic Value	13,672
Options, Number Exercisable (in shares)	99
Options, Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 50.26
Options, Exercisable, Weighted Average Remaining Contractual Term (in years)	1.8
Options, Exercisable, Intrinsic Value	8,940
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Number of Outstanding Options (in shares)	149
Outstanding Options, Weighted Average Remaining Term (in years)	1.9
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 48.98
Number of Exercisable Options (in shares)	99
Exercisable Options, Weighted Average Exercise Price (in dollars per share)	$ 50.26
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 37.46	$ 27.97	$ 21.70
Fair Value Assumptions, Expected Term (in years)	5.0	5.0	5.0
Fair Value Assumptions, Expected Volatility Rate (as a percent)	40.30%	41.00%	41.80%
Fair Value Assumptions, Risk Free Interest Rate (as a percent)	1.30%	1.80%	2.40%
Fair Value Assumptions, Expected Dividend Rate (as a percent)	0.00%	0.00%	0.00%
Stock Options [Member] | Exercise Price Range 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 36.57
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 40.35
Number of Outstanding Options (in shares)	14
Outstanding Options, Weighted Average Remaining Term (in years)	2.1
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 37.46
Number of Exercisable Options (in shares)	11
Exercisable Options, Weighted Average Exercise Price (in dollars per share)	$ 36.80
Stock Options [Member] | Exercise Price Range 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 40.36
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 44.41
Number of Outstanding Options (in shares)	56
Outstanding Options, Weighted Average Remaining Term (in years)	1.7
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 43.24
Number of Exercisable Options (in shares)	29
Exercisable Options, Weighted Average Exercise Price (in dollars per share)	$ 43.13
Stock Options [Member] | Exercise Price Range 3 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 44.42
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 48.02
Number of Outstanding Options (in shares)	20
Outstanding Options, Weighted Average Remaining Term (in years)	0.6
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 47.95
Number of Exercisable Options (in shares)	20
Exercisable Options, Weighted Average Exercise Price (in dollars per share)	$ 47.95
Stock Options [Member] | Exercise Price Range 4 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 48.03
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 52.24
Number of Outstanding Options (in shares)	39
Outstanding Options, Weighted Average Remaining Term (in years)	2.6
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 51.02
Number of Exercisable Options (in shares)	19
Exercisable Options, Weighted Average Exercise Price (in dollars per share)	$ 51.21
Stock Options [Member] | Exercise Price Range 5 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 52.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 60.07
Number of Outstanding Options (in shares)	8
Outstanding Options, Weighted Average Remaining Term (in years)	1.0
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 56.73
Number of Exercisable Options (in shares)	8
Exercisable Options, Weighted Average Exercise Price (in dollars per share)	$ 56.41
Stock Options [Member] | Exercise Price Range 6 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 60.08
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit	$ 72.58
Number of Outstanding Options (in shares)	8
Outstanding Options, Weighted Average Remaining Term (in years)	2.2
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 68.23
Number of Exercisable Options (in shares)	8
Exercisable Options, Weighted Average Exercise Price (in dollars per share)	$ 68.23
Stock Options [Member] | Exercise Price Range 7 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit	$ 72.59
Number of Outstanding Options (in shares)	4
Outstanding Options, Weighted Average Remaining Term (in years)	5.0
Outstanding Options, Weighted Average Exercise Price (in dollars per share)	$ 103.64
Number of Exercisable Options (in shares)	4
Exercisable Options, Weighted Average Exercise Price (in dollars per share)	$ 103.64
Stock Options [Member] | General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Compensation Expense Charged to general and administrative	$ 1,122	$ 1,510	$ 2,154
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Nonvested restricted stock (in shares)	30	22	0
Nonvested restricted stock, Weighted Average Grant Date Fair Value (in dollars per share)	$ 60.90	$ 55.20	$ 0.00
Granted restricted stock (in shares)	8	8	23
Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 100.46	$ 75.80	$ 55.20
Vested restricted stock in Period (in shares)	(2)	0	0
Vested in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 55.20	$ 0.00	$ 0.00
Forfeited in Period (in shares)	(6)	0	(1)
Forfeited in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 59.18	$ 0.00	$ 55.20
Nonvested restricted stock (in shares)	30	30	22
Nonvested restricted stock, Weighted Average Grant Date Fair Value (in dollars per share)	$ 72.68	$ 60.90	$ 55.20
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Term	4.4	4.9	5.6
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value	$ 2,064,000	$ 1,244,000	$ 293,000
Equity Instuments Convertible Shares (in shares)	3
Equity Instruments, Convertible, Weighted Average Conversion Price (in dollars per share)	$ 55.20
Equity Instruments, Convertible, Weighted Average Contractual Term Remaining (in years)	3.6
Equity Instruments, Convertible, Aggreagte Intrinsic Value	$ 263,000