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Stock-Based Compensation (Tables)
 3 Months Ended
Dec. 29, 2012
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 29, 2012 and December 31, 2011, respectively, were estimated using the following weighted-average assumptions:
 
 
Employee Stock Purchase Plan
 
 
Three Months Ended
 
 
 
December 29,
2012
 
December 31,
2011
 
Expected life in years
 
0.5

 
0.5

 
Expected volatility
 
34.8
%
 
49.3
%
 
Risk-free interest rate
 
0.2
%
 
0.1
%
 
Expected dividend yield
 
1.0
%
 
—

 
Weighted average fair value per share
 
$
10.60

 
$
14.93

 

    
There were no stock options granted during the three months ended December 29, 2012 and December 31, 2011.
 
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 29, 2012
 
December 31, 2011
Risk-free interest rate
0.33
%
 
0.39
%
Volatility
37.9
%
 
41.8
%
Weighted average fair value
$48.48
 
$71.59
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 29, 2012 and December 31, 2011 (in thousands):
 
Three Months Ended
 
 
December 29, 2012
 
December 31, 2011
 
Cost of sales
$
435

 
$
369

 
Research and development
476

 
393

 
Selling, general and administrative
4,083

 
3,260

 
Income tax benefit
(1,483
)
 
(1,328
)
 
 
$
3,511

 
$
2,694

 
Schedule of stock option activity
The following is a summary of option activity for our Stock Option Plans (in thousands, except per share amounts and weighted average remaining contractual term in years):
 
Number of
Shares
 
Weighted
Average
Exercise Price
Per Share
 
Weighted
Average
Remaining
Contractual
Term in Years
 
Aggregate
Intrinsic Value
Outstanding at September 29, 2012
641

 
$
27.86

 
 
 
 

Granted
—

 
—

 
 
 
 

Exercised
(68
)
 
26.96

 
 
 
 

Forfeitures
—

 
—

 
 
 
 

Expirations
—

 
—

 
 
 
 

Outstanding at December 29, 2012
573

 
$
27.97

 
3.2 years
 
$
12,168

Vested and expected to vest at December 29, 2012
573

 
$
27.97

 
3.2 years
 
$
12,168

Exercisable at December 29, 2012
556

 
$
27.47

 
3.0 years
 
$
12,083
Schedule of restricted stock award and restricted stock unit activity
The following table summarizes the activity of our time based and market- performance based restricted stock units for the first three months of fiscal 2013 (in thousands, except per share amounts):

 
Time Based Restricted Stock Units
 
Market-Based Performance Restricted Stock Units
 
Number of
Shares(1)
 
Weighted
Average
Grant Date
Fair Value
 
Number of
Shares(2)
 
Weighted
Average
Grant Date
Fair Value
Nonvested stock at September 29, 2012
440

 
$
47.81

 
152

 
$
57.55

Granted
242

 
42.28

 
97

 
48.48

Vested
(217
)
 
42.35

 
(28
)
 
49.50

Forfeited
—

 
—

 
(5
)
 
49.23

Nonvested stock at December 29, 2012
465

 
$
47.48

 
216

 
$
54.73


__________________________________________
(1)Service-based restricted stock vested during each fiscal year.
(2)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.