Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Fiscal Year (Details)	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 25, 2011	Dec. 25, 2011
Fiscal Year [Line Items]
Fiscal year duration	P53W		P52W
Second quarter year-to-date duration	P40W	P39W
Minimum
Fiscal Year [Line Items]
Fiscal year duration	P52W
Maximum
Fiscal Year [Line Items]
Fiscal year duration	P53W