Statements of Cash Flows Supplemental Disclosure (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
Other Significant Noncash Transactions [Line Items]
Capital lease obligations incurred	$ 0	$ 4,600,000	$ 0
Number of options exercised	714,014
Shares paid for tax withholding for share based compensation, shares	45,072	47,789	156,498
Shares paid for tax withholding for share based compensation, value	2,500,000	2,200,000	6,200,000
Stock Options Net Share Settlement [Member]
Other Significant Noncash Transactions [Line Items]
Aggregate exercise price value			$ 12,900,000