v2.4.0.8

Stockholders' Equity (Tables) | 12 Months Ended
--- | ---
Apr. 30, 2014
Stock Option Activity | Stock option activity was as follows:
|  | Number of Options (in thousands) |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in thousands) |
Balance as of April 30, 2012 |  |  | 12,083 |  |  | $ | 4.57 |  |  |  |  |  |  |  |  |
Options granted |  |  | 5,053 |  |  |  | 8.43 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (4,597 | ) |  |  | 2.45 |  |  |  |  |  |  |  |  |
Options forfeited |  |  | (1,710 | ) |  |  | 7.49 |  |  |  |  |  |  |  |  |
Balance as of April 30, 2013 |  |  | 10,829 |  |  |  | 6.83 |  |  |  |  |  |  |  |  |
Options granted |  |  | 2,092 |  |  |  | 8.32 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (3,360 | ) |  |  | 3.34 |  |  |  |  |  |  |  |  |
Options forfeited |  |  | (2,470 | ) |  |  | 10.22 |  |  |  |  |  |  |  |  |
Balance as of April 30, 2014 |  |  | 7,091 |  |  | $ | 7.74 |  |  |  | 7.02 |  |  | $ | 6,264 |
Options vested and expected to vest at April 30, 2014 |  |  | 6,901 |  |  | $ | 7.70 |  |  |  | 6.98 |  |  | $ | 6,253 |
Options vested and exercisable as of April 30, 2014 |  |  | 3,658 |  |  | $ | 6.71 |  |  |  | 5.40 |  |  | $ | 5,982 |
Summary of Stock Options | The summary of stock options as of April 30, 2014 is as follows (number of options in thousands):
|  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Number of Options |  |  | Weighted Average Exercise Price |
$0.00 – $2.86 |  |  | 789 |  |  | $ | 2.04 |  |  |  | 4.31 |  |  |  | 766 |  |  | $ | 2.02 |
$2.96 – $4.85 |  |  | 381 |  |  | $ | 4.36 |  |  |  | 5.98 |  |  |  | 377 |  |  | $ | 4.35 |
$4.86 – $4.86 |  |  | 759 |  |  | $ | 4.86 |  |  |  | 4.19 |  |  |  | 714 |  |  | $ | 4.86 |
$5.35 – $6.54 |  |  | 725 |  |  | $ | 6.40 |  |  |  | 8.10 |  |  |  | 333 |  |  | $ | 6.31 |
$6.58 – $7.32 |  |  | 733 |  |  | $ | 7.08 |  |  |  | 8.96 |  |  |  | 195 |  |  | $ | 6.82 |
$7.39 – $7.50 |  |  | 759 |  |  | $ | 7.41 |  |  |  | 8.80 |  |  |  | 88 |  |  | $ | 7.39 |
$7.51 – $9.46 |  |  | 815 |  |  | $ | 8.88 |  |  |  | 7.94 |  |  |  | 300 |  |  | $ | 8.72 |
$9.51 – $9.60 |  |  | 713 |  |  | $ | 9.53 |  |  |  | 7.93 |  |  |  | 133 |  |  | $ | 9.59 |
$10.24 – $12.60 |  |  | 843 |  |  | $ | 11.91 |  |  |  | 6.21 |  |  |  | 473 |  |  | $ | 12.24 |
$13.95 – $18.67 |  |  | 574 |  |  | $ | 14.64 |  |  |  | 7.73 |  |  |  | 279 |  |  | $ | 14.74 |
$0.00 – $18.67 |  |  | 7,091 |  |  | $ | 7.74 |  |  |  | 7.02 |  |  |  | 3,658 |  |  | $ | 6.71 |
Restricted Stock Activity | Restricted stock activity was as follows (number of restricted shares in thousands):
|  | Number of Restricted Shares |  |  | Weighted Average Grant Date Fair Value |
Unvested balance as of April 30, 2012 |  |  | 16 |  |  | $ | 18.67 |
Restricted shares granted |  |  | 1,251 |  |  |  | 11.14 |
Restricted shares vested |  |  | (67 | ) |  |  | 15.59 |
Restricted shares forfeited |  |  | (105 | ) |  |  | 14.71 |
Unvested balance as of April 30, 2013 |  |  | 1,095 |  |  | $ | 10.63 |
Restricted shares granted |  |  | 2,629 |  |  |  | 8.30 |
Restricted shares vested |  |  | (321 | ) |  |  | 11.11 |
Restricted shares forfeited |  |  | (426 | ) |  |  | 11.18 |
Unvested balance as of April 30, 2014 |  |  | 2,977 |  |  | $ | 8.44 |
Employee Stock Purchase Plan |
Assumptions Used to Estimate Fair Value of Options and ESSP Using Black-Scholes Option Pricing Model | The fair value of the Company’s ESPP was estimated at the date of grant using a Black-Scholes option pricing model with the following assumptions:
|  | Year Ended April 30,
|  | 2014 |  | 2013 |  | 2012
Expected volatility |  | 36% – 43% |  | 36% – 37% |  | —
Risk-free interest rate |  | 0.05% – 0.11% |  | 0.10% – 0.11% |  | —
Expected term (in years) |  | 0.5 |  | 0.5 |  | —
Dividend yield |  | — |  | — |  | —
Stock Options |
Assumptions Used to Estimate Fair Value of Options and ESSP Using Black-Scholes Option Pricing Model | The fair value of the Company’s options was estimated at the date of grant using a Black-Scholes option pricing model with the following assumptions:
|  | Year Ended April 30,
|  | 2014 |  | 2013 |  | 2012
Expected volatility |  | 53% – 54% |  | 54% – 55% |  | 55% – 58%
Risk-free interest rate |  | 1.30% – 2.09% |  | 0.83% – 1.40% |  | 1.05% – 2.14%
Expected term (in years) |  | 6.00 – 6.25 |  | 5.94 – 6.25 |  | 5.75 – 6.25
Dividend yield |  | — |  | — |  | —

X
- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration