The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph g
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 2
-Paragraph 12, 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 86
-Paragraph 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Accounting Policies (Details 4) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended											1 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011 2004 Stock Incentive Plan	Jul. 03, 2011 2004 Stock Incentive Plan Stock options	Jul. 03, 2011 2004 Stock Incentive Plan Restricted stock	Jul. 03, 2011 Prior stock incentive plan Stock options	Jul. 03, 2011 Class A Management Stock Purchase Plan	Jul. 03, 2011 Management Stock Purchase Plan Restricted stock units (RSUs)	Jul. 04, 2010 Management Stock Purchase Plan Restricted stock units (RSUs)	Jul. 03, 2011 Class A ISOs	Jul. 03, 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 (as a percent)												100.00%	50.00%
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 (in shares)										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 (in shares)									2,000,000
Granted (in shares)							1,400			96,454	158,473
Fair value assumptions
Expected life (in years)										3.0	3.0
Expected stock price volatility (as a percent)										44.90%	45.60%
Expected dividend yield (as a percent)										1.20%	1.50%
Risk-free interest rate (as a percent)										1.20%	1.50%
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	10.4	9.2	19.2	17.6
Research and Development
Research and development costs included in selling, general and administrative	$ 5.7	$ 4.5	$ 10.7	$ 9.7