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Stock-Based Compensation (Tables)
3 Months Ended
Jul. 28, 2012
Stock-Based Compensation [Abstract]  
Schedule of Grants Made During the Period
The table below summarizes the grants made during the first quarter of fiscal 2013:

(Unaudited, shares/units in millions)
 
Shares/units
granted
 
Liability/
Equity
award
 
Settlement
Stock options
 
0.2
 
Equity
 
Common shares
Stock appreciation rights ("SARs")
 
0.1
 
Liability
 
Cash
Restricted stock units
 
0.2
 
Liability
 
Cash
Performance-based units
 
0.1
 
Liability
 
Cash
Performance-based shares
 
0.1
 
Equity
 
Common shares
Stock Options, Valuation Assumptions
The fair value of stock options granted during the first quarter of fiscal 2013 was calculated using the following assumptions:

(Unaudited)
 
7/28/12
 
Risk-free interest rate
  0.75%
Dividend rate
  0%
Expected life in years
  5.0 
Stock price volatility
  83.8%
Fair value per share
 $7.87 

Stock Appreciation Rights ("SARs"). We granted 0.1 million stock appreciation rights to employees during the first quarter of fiscal 2013. SARs will be paid in cash upon vesting and as such were accounted for as liability-based awards that will be remeasured to reflect the fair value at the end of each reporting period. These awards vest at 25% per year, beginning one year from the grant date for a term of four years. The fair value for the SARs is estimated at the end of each period using the Black-Scholes option-pricing model, which requires management to make certain assumptions. The average expected life was based on the contractual term of the SARs and expected employee exercise and post-vesting employment termination trends (which is consistent with the expected life of our option awards). The risk-free rate was based on U.S. Treasury issues with a term equal to the expected life assumed at the end of the reporting period.

The fair value of the SARs granted during the first quarter of fiscal 2013 was calculated using the following assumptions:

(Unaudited)
 
7/28/12
 
Risk-free interest rate
  0.75%
Dividend rate
  0%
Expected life in years
  5.0 
Stock price volatility
  84.0%
Fair value per share
 $7.88