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Stock-Based Compensation (Tables)
 3 Months Ended
Jan. 02, 2016
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 January 2, 2016 and December 27, 2014, respectively, were estimated using the following weighted-average assumptions:
 
 
Employee Stock Purchase Plan
 
 
Three Months Ended
 
 
January 2,
2016
 
December 27,
2014
Expected life in years
 
0.5

 
0.5

Expected volatility
 
28.7
%
 
24.8
%
Risk-free interest rate
 
0.19
%
 
0.10
%
Expected dividend yield
 
—
%
 
—
%
Weighted average fair value per share
 
$
13.27

 
$
13.97
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
 
 
January 2, 2016
 
December 27, 2014
Risk-free interest rate
 
1.20
%
 
0.96
%
Volatility
 
27.0
%
 
28.7
%
Weighted average fair value
 
$74.48
 
$70.57
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 January 2, 2016 and December 27, 2014 (in thousands):
 
Three Months Ended
 
January 2, 2016
 
December 27, 2014
Cost of sales
$
605

 
$
597

Research and development
426

 
330

Selling, general and administrative
2,714

 
3,463

Income tax benefit
(351
)
 
(430
)
 
$
3,394

 
$
3,960
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 2016 (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 October 3, 2015
394

 
$
65.17

 
199

 
$
67.09

Granted
231

 
61.06

 
57

 
74.48

Vested (1)
(168
)
 
60.59

 
(57
)
 
48.48

Forfeited
(1
)
 
65.04

 
(38
)
 
48.48

Nonvested stock at January 2, 2016
456

 
$
64.78

 
161

 
$
74.09


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