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STOCKHOLDERS' EQUITY (Tables) | 9 Months Ended
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Jan. 31, 2013
Summary of Stock Option Activity | A summary of stock option activity for the nine months ended January 31, 2013 is as follows:
|  | Stock Options |  |  | Weighted Average Exercise Price |
Outstanding, April 30, 2012 |  |  | 1,661 |  |  | $ | 10.55 |
Granted |  |  | 285 |  |  | $ | 4.03 |
Exercised |  |  | — |  |  | $ | — |
Forfeited |  |  | (589 | ) |  | $ | 11.43 |
Outstanding, January 31, 2013 |  |  | 1,357 |  |  | $ | 8.81 |
Exercisable, January 31, 2013 |  |  | 981 |  |  | $ | 10.64 |
Summary of Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity | A summary of restricted stock, restricted stock unit and performance stock unit activity for the nine months ended January 31, 2013 is as follows:
|  | Restricted Stock / Restricted Stock Units |  |  | Weighted Average Grant Price |  |  | Performance Stock Units (1) |  |  | Weighted Average Grant Price |
Outstanding, April 30, 2012 |  |  | 784 |  |  | $ | 4.47 |  |  |  | 596 |  |  | $ | 4.96 |
Granted |  |  | 415 |  |  | $ | 5.02 |  |  |  | 316 |  |  | $ | 5.17 |
Class A Common Stock Vested |  |  | (489 | ) |  | $ | 4.01 |  |  |  | — |  |  | $ | — |
Forfeited |  |  | (69 | ) |  | $ | 4.82 |  |  |  | (166 | ) |  | $ | 5.01 |
Outstanding, January 31, 2013 |  |  | 641 |  |  | $ | 5.09 |  |  |  | 746 |  |  | $ | 5.04 |
(1) | Performance stock units are included at the 100% attainment level. Attainment of maximum annual returns on net assets could result in the issuance of an additional 435 shares of Class A common stock.
Schedule of Fair Values of Stock Options Related to Shares Issued Under Employee Stock Purchase Plan | Our calculations of stock-based compensation expense associated with stock options and our Employee Stock Purchase Plan for the three and nine months ended January 31, 2013 and 2012 were made using the Black-Scholes valuation model. The fair value of stock options grants and shares to be purchased under our Employee Stock Purchase Plan were estimated assuming no expected dividend yield using the following weighted average assumptions for the three and nine months ended January 31, 2013 and 2012:
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Stock Options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected life |  |  | 6.79 years |  |  |  | — |  |  |  | 6.79 years |  |  |  | — |
Risk-free interest rate |  |  | 1.04 | % |  |  | 0.00 | % |  |  | 1.04 | % |  |  | 0.00 | %
Expected volatility |  |  | 84.55 | % |  |  | 0.00 | % |  |  | 84.55 | % |  |  | 0.00 | %
|  | Three Months Ended January 31, |  |  | Nine Months Ended January 31, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Employee Stock Purchase Plan: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected life |  |  | 0.5 years |  |  |  | 0.5 years |  |  |  | 0.5 years |  |  |  | 0.5 years |
Risk-free interest rate |  |  | 0.12 | % |  |  | 0.06 | % |  |  | 0.11 | % |  |  | 0.12 | %
Expected volatility |  |  | 53.09 | % |  |  | 53.78 | % |  |  | 43.73 | % |  |  | 47.54 | %

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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