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Stock-Based Compensation (Tables)
 3 Months Ended
Dec. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of weighted-average assumptions used to estimate fair value of stock options granted and shares purchased
The fair values of shares purchased under the Employee Stock Purchase Plan (“ESPP”) for the three months ended December 30, 2017 and December 31, 2016, respectively, were estimated using the following weighted-average assumptions:
 
 
Employee Stock Purchase Plan
 
 
Three Months Ended
 
 
December 30,
2017
 
December 31,
2016
Expected life in years
 
0.5

 
0.5

Expected volatility
 
47.9
%
 
31.6
%
Risk-free interest rate
 
1.21
%
 
0.47
%
Expected dividend yield
 
—
%
 
—
%
Weighted average fair value per share
 
$
70.75

 
$
23.37
Schedule of weighted average assumptions of performance units
The weighted average fair value for these performance units was determined using a Monte Carlo simulation model incorporating the following weighted average assumptions:
 
 
Three Months Ended
 
 
December 30, 2017
 
December 31, 2016
Risk-free interest rate
 
1.7
%
 
1.3
%
Volatility
 
37.0
%
 
31.0
%
Weighted average fair value
 
$315.05
 
$163.17
Schedule of stock-based compensation expense
The following table shows total stock-based compensation expense and related tax benefits included in the condensed consolidated statements of operations for the three months ended December 30, 2017 and December 31, 2016 (in thousands):
 
 
Three Months Ended
 
 
December 30,
2017
 
December 31,
2016
Cost of sales
 
$
988

 
$
960

Research and development
 
668

 
1,053

Selling, general and administrative
 
5,420

 
7,642

Income tax benefit
 
(1,609
)
 
(1,489
)
 
 
$
5,467

 
$
8,166
Schedule of restricted stock award and restricted stock unit activity
The following table summarizes the activity of our time-based and performance restricted stock units for the first three months of fiscal 2018 (in thousands, except per share amounts):
 
Time Based Restricted Stock Units
 
Performance Restricted Stock Units
 
Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
 
Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
Nonvested stock at September 30, 2017
399

 
$
118.83

 
176

 
$
105.34

Granted
90

 
260.64

 
78

 
315.05

Vested (1)
(198
)
 
83.69

 
(95
)
 
70.57

Forfeited
(1
)
 
145.96

 
—

 
—

Nonvested stock at December 30, 2017
290

 
$
152.82

 
159

 
$
155.76


__________________________________________
(1)Service-based restricted stock units vested during the fiscal year. Performance-based restricted stock units included at 100% of target goal; under the terms of the awards, the recipient may earn between 0% and 200% of the award.