Stockholder's Equity (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended							1 Months Ended		12 Months Ended							2 Months Ended
	Dec. 30, 2012	Jan. 01, 2012	Jan. 02, 2011	Dec. 30, 2012 Stock Options [Member]	Jan. 01, 2012 Stock Options [Member]	Jan. 02, 2011 Stock Options [Member]	Dec. 30, 2012 Non-Employee Stock Option [Member]	Feb. 28, 2011 Performance Shares [Member]	Feb. 28, 2010 Performance Shares [Member]	Dec. 30, 2012 Performance Shares [Member]	Jan. 01, 2012 Performance Shares [Member] installment	Jan. 02, 2011 Performance Shares [Member]	Jan. 03, 2010 Performance Shares [Member]	Dec. 30, 2012 Restricted Stock [Member]	Jan. 01, 2012 Restricted Stock [Member]	Jan. 02, 2011 Restricted Stock [Member]	Feb. 22, 2013 Subsequent Event [Member] Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options maximum life	10 years						10 years
Preferred stocks issued
Preferred stocks outstanding
Stock options proportion exercisable on first second and third year	0.3333
Share-based compensation expense				$ 8.0	$ 5.8	$ 4.7				$ 3.2	$ 3.7	$ 2.6		$ 1.4	$ 1.4	$ 1.2
Vesting period over which employee stock option grants are evenly expensed				3 years
Period of historical stock price corresponded to the expected term of the option	6 years
Period used for the exchange traded option included the longest dated options	3 months
Grant date fair value of stock options granted	$ 23.90	$ 18.94	$ 16.44
Period after issuance until stock options exercisable							1 year
Pretax intrinsic value of options exercised		22.3	18.5
Intrinsic value of options outstanding	42.1
Intrinsic value of options exercisable	38.9
Amount of cash received from exercise of stock options		19.9	14.8
Unrecognized compensation cost related to non-vested awards				$ 8.0						$ 6.5				$ 1.4
Weighted average period for non-vested awards expected to be recognized				1 year 4 months 18 days										1 year 3 months 18 days
Performance period for judging awards										3 years
Shares of common stock issued in installments of performance share plan								47,589	44,751				53,834
Share based compensation arrangement by share based payment award, shares expected to be issued in three equal installments											109,557
Number of equal annual installments											3
Market price of issued shares										$ 55.58
Number of shares issued										36,531							23,519
Number of shares expected to be issued in 2014, maximum										36,493
Grant received by officers and executives as percentage of participants annual base salary														30.00%
Shares of restricted stock issued and outstanding														121,769