Debt (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Jan. 01, 2012	Sep. 21, 2011
Debt (Textual) [Abstract]
Unsecured revolving credit agreement				$ 200
Debt (Additional Textual) [Abstract]
Annual facility fee	0.175%
Outstanding borrowings	0	0	0
Maximum amount of uncommitted line of credit	20
Uncommitted line of credit initiation date	Feb. 10, 2010
Senior notes maturity	150
Long term debt maturing current year	Nov. 12, 2012
Senior long term notes due	30
Overall weighted average interest rate on its debt and capital lease obligations spot rate	5.90%	5.90%	5.90%
Overall weighted average interest rate on debt and capital lease obligations	6.10%	6.00%
Debt and capital lease obligations	595.3
Outstanding borrowing	$ 25
Minimum [Member]
Debt (Textual) [Abstract]
Fixed charges ratio	100.00%
Operating cash flow ratio	100.00%
Maximum [Member]
Debt (Textual) [Abstract]
Fixed charges ratio	150.00%
Operating cash flow ratio	600.00%