Receivables (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Valuation and Qualifying Accounts Disclosure [Line Items]
Client cash collections	$ 2,700,000,000	$ 2,200,000,000
Cash collections received from third party arrangements with nonrecourse payment assignments	69,100,000	68,200,000
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation allowances and reserves, charged to cost and expense	$ 13,483,000	$ 11,365,000	$ 9,856,000