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Credit Facility (Details) (USD $)
0 Months Ended 1 Months Ended 9 Months Ended
Sep. 28, 2012
Dec. 31, 2011
Jun. 29, 2012
Revolving Credit Facility [Member]
May 31, 2012
Revolving Credit Facility [Member]
Sep. 28, 2012
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]          
Repayment of Oustanding Balance, Line of Credit       $ 500,000,000  
Line of Credit Facility, Covenant Terms     five-year    
Line of Credit Facility, Amount Outstanding   0      
Unsecured Revolving Credit Facility, Maximum Borrowing Capacity     250,000,000    
Total Borrowings Under Unsecured Revolving Credit Facilty - Short Term 0 500,000,000      
Increase in borrowing capacity of line of credit         $ 250,000,000