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Stock-Based Compensation (Tables)
 6 Months Ended
Dec. 29, 2013
Compensation and Retirement Disclosure [Abstract]  
Stock Option Activity
The following table summarizes the stock option activity for the six months ended December 29, 2013 (in thousands, except per share price data):
 
Stock Option
Shares
 
Weighted
Average Option
Exercise Price
per Share
 
Weighted
Average Grant
Date Fair Value
per Share
 
Aggregate
Intrinsic Value
Outstanding, June 30, 2013
1,187

 
$
17.08

 
 
 
$
4,978

Granted
4

 
$
24.76

 
$
6.82

 
 
Exercised
(673
)
 
$
16.19

 
 
 
$
5,330

Expired or forfeited
(5
)
 
$
16.83

 
 
 
 
Outstanding, December 29, 2013
513

 
$
18.31

 
 
 
$
3,919
Restricted Stock Unit Activity
The following table summarizes the RSU activity for the six months ended December 29, 2013 (in thousands, except per share price data):

 
Restricted Stock
Units
 
Weighted Average
 Grant Date
Fair Value Per Share
 
Aggregate
Intrinsic Value
Outstanding, June 30, 2013
3,696

 
$
21.31

 
$
77,394

Granted
69

 
$
24.73

 
 
Vested
(215
)
 
$
18.99

 
$
4,901

Expired or forfeited
(94
)
 
$
22.08

 
 
Outstanding, December 29, 2013
3,456

 
$
21.51

 
$
88,288
Additional Information Relating to Stock Options and RSU's
Additional information relating to the Company’s stock based compensation plans, including employee stock options and RSUs at December 29, 2013 and June 30, 2013 is as follows (in thousands):
 
December 29, 2013
 
June 30, 2013
Outstanding options exercisable
377

 
1,039

Options and RSUs available for grant
6,079

 
6,040

Total reserved common stock shares for stock option plans
10,048

 
10,923
Stock-Based Compensation Expense
For the three and six months ended December 29, 2013 and December 23, 2012, stock‑based compensation expense associated with the Company’s stock options and RSUs was as follows (in thousands):
 
Three Months Ended
 
Six Months Ended
 
December 29, 2013
 
December 23, 2012
 
December 29, 2013
 
December 23, 2012
Cost of sales
$
1,362

 
$
1,123

 
$
2,610

 
$
2,281

Selling, general and administrative expense
3,123

 
2,858

 
6,650

 
6,018

Research and development expense
2,142

 
1,397

 
4,229

 
2,818

Total stock‑based compensation expense
$
6,627

 
$
5,378

 
$
13,489

 
$
11,117
Stock Options Valuation Assumptions
The fair value of the stock options associated with the above compensation expense for the six months ended December 29, 2013 and December 23, 2012 was determined at the grant date using the Black‑Scholes option pricing model with the following weighted average assumptions:
 
December 29, 2013
 
December 23, 2012
Expected life
3.5 years

 
3.5 years

Risk free interest rate
0.70
%
 
0.36
%
Volatility
36.37
%
 
39.30
%
Dividend yield
0.00
%
 
0.00
%