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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 27, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Number and Weighted Average Exercise Price of Options Issued and Outstanding under all Stock Option Plans
The number and weighted-average exercise price of options issued and outstanding under all of the Company’s equity plans are as follows (in thousands, except for weighted-average exercise prices):
 
Six Months Ended 
 June 27, 2020
 
Shares
 
Weighted-Average
Exercise Price
Options outstanding, beginning of period
5,212

 
$
54.23

Granted
374

 
184.72

Canceled
(121
)
 
120.37

Exercised
(1,209
)
 
28.71

Options outstanding, end of period
4,256

 
$
71.06

Options exercisable, end of period
2,580

 
$
41.36


Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The number of RSUs issued and outstanding under all of the Company’s equity plans are as follows (in thousands, except for weighted-average grant date fair value amounts):
 
Six Months Ended 
 June 27, 2020
 
Units
 
Weighted-Average Grant
 Date Fair Value
RSUs outstanding, beginning of period
2,797

 
$
96.85

Granted
79

 
183.43

Canceled
(3
)
 
144.90

Expired

 

Vested
(26
)
 
134.61

RSUs outstanding, end of period
2,847

 
$
98.85


Schedule of Nonvested Performance-based Units Activity
The number of PSUs outstanding under all of the Company’s equity plans are as follows (in thousands, except for weighted-average grant date fair value amounts):
 
Six Months Ended 
 June 27, 2020
 
Units
 
Weighted-Average Grant
 Date Fair Value
PSUs outstanding, beginning of period
412

 
$
102.22

Granted
97

 
179.42

Canceled
(7
)
 
122.13

Expired

 

Vested
(29
)
 
90.69

PSUs outstanding, end of period
473

 
$
118.47


Schedule of 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
 
Six Months Ended
 
June 27,
2020
 
June 29,
2019
 
June 27,
2020
 
June 29,
2019
Risk-free interest rate
0.3% to 0.6%
 
1.8% to 2.4%
 
0.3% to 1.7%
 
1.8% to 2.6%
Expected term (in years)
5.1
 
5.2
 
5.1
 
5.2
Estimated volatility
26.9% to 35.5%
 
28.3% to 28.9%
 
26.9% to 35.5%
 
28.3% to 30.0%
Expected dividends
0%
 
0%
 
0%
 
0%
Weighted-average fair value of options granted
$60.12
 
$41.90
 
$49.82
 
$41.30