Stock-Based Compensation Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		0 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012 Stock Options	Jun. 30, 2012 Stock Options, 50 Month Vesting Class	Jun. 30, 2012 Stock Options, 100 Month Vesting Class	Jun. 30, 2012 Restricted Stock	Jun. 30, 2012 1993 Plan and 1998 Plan	Jul. 19, 2011 1993 Stock Plan	Jun. 30, 2012 1993 Stock Plan Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	$ 0.1	$ 0.1	$ 0.1	$ 0.1
Total unrecognized compensation cost related to stock option plan									$ 41.3
Period for recognition of costs related to stock options and restricted stock units (in years)					5 years 7 months 6 days			4 years 7 months 6 days
Increased number of shares available for issuance (in shares)										3.3
Shares reserved for future awards (in shares)											2.6
Stock options vesting period (in months)						50 months	100 months