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Share-Based Compensation (Tables)
3 Months Ended
Apr. 04, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number and Weighted Average Exercise Price of Options Issued and Outstanding under all Stock Option Plans
Share-Based Compensation
The number and weighted-average exercise price of options issued and outstanding under all of the Company’s stock option plans are as follows (in thousands, except for exercise prices):
 
Three Months Ended 
 April 4, 2015
 
Shares
 
Average
Exercise Price
Options outstanding, beginning of period
9,956

 
$
23.59

Granted
282

 
$
30.41

Canceled
(52
)
 
$
22.46

Exercised
(273
)
 
$
18.31

Options outstanding, end of period
9,913

 
$
23.93

Options exercisable, end of period
6,114

 
$
24.07

Options available for grant, end of period
5,528

 
 
Range of Assumptions Used and Resulting Weighted-Average Fair Value of Options Granted at Date of Grant
The range of assumptions used and the resulting weighted-average fair value of options granted at the date of grant were as follows:
 
Three Months Ended
 
April 4,
2015
 
March 29,
2014
Risk-free interest rate
1.3% to 1.8%
 
1.5% to 1.6%
Expected term (in years)
5.5
 
5.1
Estimated volatility
33.5% to 37.4%
 
32.5% to 32.8%
Expected dividends
0%
 
0%
Weighted-average fair value of options granted
$10.35
 
$8.89