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Stock-Based Compensation
 9 Months Ended
Mar. 31, 2013
Share-based Compensation [Abstract]  
Stock-Based Compensation
Stock-Based Compensation
The Company currently has one equity-based compensation plan from which stock-based compensation awards can be granted to employees and directors. In addition, the Company has plans that have been terminated as to future grants, but under which options are currently outstanding.
During the first quarter of fiscal 2013, the Company initiated grants of performance-based stock option and stock unit awards. The compensation expense for an award with a performance condition is based on the probable outcome of that performance condition. Compensation expense is recognized if the Company believes it is probable that the performance condition will be achieved and is adjusted for subsequent changes in the estimate or actual outcome. As with non-performance based awards, compensation expense is recognized over the vesting period. The vesting period runs from the date of grant to the expected date that the performance objective is likely to be achieved.
The Company also has an Employee Stock Purchase Plan ("ESPP") that provides employees with the opportunity to purchase the Company’s common stock at a discount. The ESPP was amended in the second quarter of fiscal 2012 to increase the six-month participation period to a twelve-month participation period, divided into two equal six-month purchase periods, and to provide for a look-back feature. At the end of each six-month period, employees purchase the Company's common stock through the ESPP at 15% less than the fair market value of the common stock on the first day of the twelve-month participation period or the purchase date, whichever is lower. The plan amendment also provides for an automatic reset feature to start participants on a new twelve-month participation period if the share value declines during the first six-month purchase period.
Stock Option Awards
The following table summarizes outstanding option awards as of March 31, 2013, and changes during the nine months then ended (shares in thousands): 
 
Number of Shares
 
Weighted-Average Exercise Price
Outstanding at June 24, 2012
8,800

 
$
36.71

Granted
3,354

 
28.31

Exercised
(1,569
)
 
27.79

Forfeited or expired
(453
)
 
37.41

Outstanding at March 31, 2013
10,132

 
$
35.28


Restricted Stock and Stock Unit Awards
A summary of nonvested shares of restricted stock and stock unit awards outstanding as of March 31, 2013, and changes during the nine months then ended, is as follows (shares in thousands):
 
Number of
  Shares/Units  
 
Weighted-
Average Grant-
Date Fair
Value
Nonvested at June 24, 2012
517

 
$
37.41

Granted
350

 
28.11

Vested
(181
)
 
35.16

Forfeited
(7
)
 
29.86

Nonvested at March 31, 2013
679

 
$
33.29


Stock-Based Compensation Valuation and Expense
The Company accounts for its employee stock-based compensation plan using the fair value method. The fair value method requires the Company to estimate the grant date fair value of its stock-based awards and amortize this fair value to compensation expense over the requisite service period or vesting term.
To estimate the fair value of the Company's stock option awards, the Company currently uses the Black-Scholes option-valuation model. The determination of the fair value of stock-based payment awards on the date of grant using an option-valuation model is affected by the Company's stock price as well as assumptions regarding a number of complex and subjective variables. These variables include the expected stock price volatility over the term of the awards, actual and projected employee stock option exercise behaviors, risk-free interest rate and expected dividends. Due to the inherent limitations of option-valuation models available today, including future events that are unpredictable and the estimation process utilized in determining the valuation of the stock-based awards, the ultimate value realized by award holders may vary significantly from the amounts expensed in the Company's financial statements.
For restricted stock and stock unit awards, grant date fair value is based upon the market price of the Company's common stock on the date of the grant. This fair value is then amortized to compensation expense over the requisite service period or vesting term.
Stock-based compensation expense is reduced by estimated forfeitures such that expense is recognized only for those stock-based awards that are expected to vest. A forfeiture rate is estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from initial estimates.

Total stock-based compensation expense was as follows (in thousands):
 
Three Months Ended
 
Nine Months Ended
Income Statement Classification
March 31,
2013
 
March 25,
2012
 
March 31,
2013
 
March 25,
2012
Cost of revenue, net
$
2,334

 
$
2,104

 
$
6,875

 
$
5,433

Research and development
3,441

 
2,738

 
10,445

 
7,769

Sales, general and administrative
8,140

 
7,407

 
23,625

 
21,682

Total
$
13,915

 
$
12,249

 
$
40,945

 
$
34,884