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 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013 item	Jul. 01, 2012
Stock-based compensation
Number of stock incentive plans			2
Shipping and Handling
Shipping and handling costs included in selling, general and administrative expense	$ 10.2	$ 9.2	$ 19.3	$ 18.8
Research and Development
Research and development costs included in selling, general, and administrative expense	$ 5.5	$ 5.2	$ 10.9	$ 10.5
ISOs \| Class A Common Stock
Stock-based compensation
Minimum exercise price as percentage of fair market value of common stock on grant date			100.00%
NSOs \| Class A Common Stock
Stock-based compensation
Minimum exercise price as percentage of fair market value of common stock on grant date			100.00%
Second Amended and Restated 2004 Stock Incentive Plan
Stock-based compensation
Number of stock-based compensation plans available for grant of new equity awards			1
Options granted (in shares)			9,500
Second Amended and Restated 2004 Stock Incentive Plan \| Stock options
Stock-based compensation
Vesting period if not immediate			4 years
Percentage of stock options becoming exercisable			25.00%
Expiration period			10 years
Second Amended and Restated 2004 Stock Incentive Plan \| Restricted stock
Stock-based compensation
Vesting rate per year for maximum vesting period			0.33
Granted (in shares)			3,167
Second Amended and Restated 2004 Stock Incentive Plan \| Restricted stock \| Maximum
Stock-based compensation
Vesting period if not immediate			3 years
Management Stock Purchase Plan \| Class A Common Stock
Stock-based compensation
Exercise price as percentage of fair market value of common stock on grant date			67.00%
Shares authorized	2,000,000		2,000,000
Management Stock Purchase Plan \| Restricted stock units (RSUs)
Stock-based compensation
Granted (in shares)			44,777	63,739
Number of common shares for each unit of award held			1
Fair value assumptions
Expected life			3 years	3 years
Expected stock price volatility (as a percent)			34.10%	38.30%
Expected dividend yield (as a percent)			0.90%	1.10%
Risk-free interest rate (as a percent)			0.40%	0.40%
Weighted average grant-date fair value (in dollars per share)			$ 18.05	$ 15.68
Management Stock Purchase Plan \| Restricted stock units (RSUs) \| Minimum
Stock-based compensation
Vesting period if not immediate			3 years