Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Jan. 01, 2012	Jan. 02, 2011
Summary of Long-Term Debt
Long term debt outstanding	$ 298.0	$ 250.0
4.04% Senior Notes due September 2015 [Member]
Summary of Long-Term Debt
Long term debt outstanding	75.0	75.0
4.74% Senior Notes due September 2017 [Member]
Summary of Long-Term Debt
Long term debt outstanding	100.0	100.0
5.30% Senior Notes due September 2020 [Member]
Summary of Long-Term Debt
Long term debt outstanding	75.0	75.0
$550.0 million revolving credit facility, weighted average rate of 2.48% at January 1, 2012 [Member]
Summary of Long-Term Debt
Long term debt outstanding	$ 48.0	$ 0