Accounting Policies (Details 4) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended								1 Months Ended
	Oct. 02, 2011	Oct. 03, 2010	Oct. 02, 2011 year segment M plan week	Oct. 03, 2010	Oct. 02, 2011 2004 Stock Incentive Plan	Oct. 03, 2010 2004 Stock Incentive Plan	Oct. 02, 2011 2004 Stock Incentive Plan plan	Oct. 03, 2010 2004 Stock Incentive Plan	Oct. 02, 2011 2004 Stock Incentive Plan Stock options year	Oct. 03, 2010 2004 Stock Incentive Plan Stock options year	Oct. 02, 2011 2004 Stock Incentive Plan Restricted stock	Oct. 03, 2010 2004 Stock Incentive Plan Restricted stock	Oct. 02, 2011 2004 Stock Incentive Plan Restricted stock	Oct. 03, 2010 2004 Stock Incentive Plan Restricted stock	Oct. 02, 2011 Prior stock incentive plan Stock options	Oct. 02, 2011 Class A Management Stock Purchase Plan	Oct. 02, 2011 Management Stock Purchase Plan Restricted stock units (RSUs) year	Oct. 03, 2010 Management Stock Purchase Plan Restricted stock units (RSUs) year	Oct. 02, 2011 Class A ISOs	Oct. 02, 2011 Class A NSOs	Jan. 31, 2011 Patrick S. O'Keefe
Stock-based compensation
Number of stock incentive plans			3
Number of stock-based compensation plans available for grant of new equity awards							1
Period over which options become exercisable (in years)									4Y						5Y		3Y
Percentage of stock options becoming exercisable per year									25% per year						20% per year
Expiration period (in years)									10Y						10Y
Minimum exercise price as percentage of fair market value of common stock on grant date																			100.00%	50.00%
Number of options issued to key employees (in shares)					280,000	282,500	280,000	282,500
Minimum vesting period if not immediate (in years)													1Y
Maximum vesting period (in years)													3Y
Vesting rate per year for maximum vesting period													one-third per year
Number of common shares for each unit of award held																	1
Exercise price as percentage of fair market value of common stock on grant date (as a percent)																67.00%
Minimum period over which options are deferred (in years)																	Three years
Shares authorized																2,000,000
Granted (in shares)											107,786	104,975	109,186	104,975			96,454	158,473
Fair value assumptions
Expected life (in years)									6.0	6.0							3.0	3.0
Expected stock price volatility (as a percent)									40.90%	41.30%							44.90%	45.60%
Expected dividend yield (as a percent)									1.50%	1.30%							1.20%	1.50%
Risk-free interest rate (as a percent)									1.60%	1.90%							1.20%	1.50%
Weighted average grant-date fair value of stock options (in dollars per share)									$ 10.19	$ 12.36
Weighted average grant-date fair value (in dollars per share)																	$ 16.25	$ 12.81
Separation Agreement
Charge related to separation agreement																					$ 6.3
Expected cash severance related to separation agreement																					3.3
Non-cash charge related to separation agreement																					3.0
Shipping and Handling
Shipping cost	9.2	8.6	28.4	25.7
Research and Development
Research and development costs included in selling, general and administrative	$ 5.3	$ 4.3	$ 16.0	$ 14.0