Stockholders' Equity (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		12 Months Ended
	Feb. 28, 2011	Feb. 28, 2010	Jan. 01, 2012	Jan. 02, 2011	Jan. 03, 2010
Stockholder's Equity (Textual) [Abstract]
Stock options maximum life			10 Years
Share based compensation expense			$ 5.8	$ 4.7	$ 5.2
Stockholders Equity (Additional Textual) [Abstract]
Preferred stocks issued
Preferred stocks outstanding
Number of Treasury stock shares			577,923
Number of common stock shares repurchased			658,562		36,239
Number of common stock shares authorized to repurchase			2,500,000
Amount of common stock share repurchase			34.9		0.8
Stock options exercisable period and maximum life			Stock options become exercisable in one-third increments on the first, second and third anniversary of the grant and have a maximum 10 year life
Stock options proportion exercisable on first second and third year			0.33
Vesting period over which employee stock option grants are evenly expensed			3 years
Share based compensation expense			5.8	4.7	5.2
Grant date fair value of stock options granted			$ 18.94	$ 16.44	$ 10.02
Share based compensation arrangement by share based payment award shares expected to be issued in three equal installment			109,557
Number of share issued			36,531
Non-Employee Stock Option Plan [Member]
Stockholder's Equity (Textual) [Abstract]
Stock options maximum life			10 Years
Pretax intrinsic value of options exercised			18.5	4.3
Intrinsic value of options outstanding			44.1
Intrinsic value of options exercisable			40.3
Amount of cash received from exercise of stock options			14.8	3.9
Unrecognized compensation cost related to non-vested stock option awards			5.8
Weighted average period for non-vested stock option awards expected to be recognized			1.3
Restricted Stock Award Program [Member]
Stockholder's Equity (Textual) [Abstract]
Unrecognized compensation cost related to non-vested stock option awards			1.5
Weighted average period for non-vested stock option awards expected to be recognized			1.3
Share based compensation expense			1.4	1.2	1.1
Shares of restricted stock issued and outstanding			117,432
Grant received by officers and executives as percentage of participants annual base salary				30.00%
Stockholders Equity (Additional Textual) [Abstract]
Share based compensation expense			1.4	1.2	1.1
Performance Share Plan [Member]
Stockholder's Equity (Textual) [Abstract]
Unrecognized compensation cost related to non-vested stock option awards			0
Share based compensation expense			3.7	2.6	2.6
Shares of common stock issued in installments of performance share plan	47,589	44,751			53,834
Market price of issued share			$ 55.58
Stockholders Equity (Additional Textual) [Abstract]
Share based compensation expense			$ 3.7	$ 2.6	$ 2.6
Maximum [Member]
Stockholder's Equity (Textual) [Abstract]
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			9 months
Minimum [Member]
Stockholder's Equity (Textual) [Abstract]
Period of historical stock price corresponded to the expected term of the option			5 years
Period used for the exchange traded option included the longest dated options			6 months