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Stock-Based Compensation And Employee Purchase Plan (Tables) | 12 Months Ended
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Mar. 31, 2018
Employee Stock Purchase Plan |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The estimated fair value of stock purchase rights granted under the Employee Stock Purchase Plan was estimated using the Black-Scholes pricing model with the following weighted-average assumptions:
|  |  | Years Ended March 31,
|  |  | 2018 |  |  | 2017 |  |  | 2016
Expected volatility |  |  | 40% |  |  | 37% |  |  | 43%
Expected dividend yield |  |  | - |  |  | - |  |  | -
Risk-free interest rate |  |  | 1.33% |  |  | 0.65% |  |  | 0.39%
Weighted average expected term (in years) |  |  | 0.8 years |  |  | 0.8 years |  |  | 0.8 years
Weighted average fair value of rights granted |  | $ | 4.10 |  | $ | 4.19 |  | $ | 3.25
Option Grants |
Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award | Stock Option activity under all the Company's stock option plans since March 31, 2015, is summarized as follows:
|  |  |  |  | Weighted
|  |  |  |  | Average
|  |  |  |  | Exercise
|  | Number of |  |  | Price
|  | Shares |  |  | Per Share
Outstanding at March 31, 2015 |  | 5,327,907 |  | $ | 5.19
Granted |  | 723,776 |  |  | 8.63
Exercised |  | (1,162,175) |  |  | 2.56
Canceled/Forfeited |  | (96,242) |  |  | 8.06
Outstanding at March 31, 2016 |  | 4,793,266 |  |  | 6.29
Granted |  | 407,392 |  |  | 14.63
Exercised |  | (603,998) |  |  | 2.34
Canceled/Forfeited |  | (134,248) |  |  | 8.41
Outstanding at March 31, 2017 |  | 4,462,412 |  |  | 7.52
Granted |  | 609,135 |  |  | 14.95
Exercised |  | (773,897) |  |  | 3.95
Canceled/Forfeited |  | (299,365) |  |  | 13.05
Outstanding at March 31, 2018 |  | 3,998,285 |  | $ | 8.93
Vested and expected to vest at March 31, 2018 |  | 3,998,285 |  | $ | 8.93
Exercisable at March 31, 2018 |  | 3,025,925 |  | $ | 7.66
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The fair value of each of the Company's option grants has been estimated on the date of grant using the Black-Scholes pricing model with the following assumptions:
|  |  | Years Ended March 31,
|  |  | 2018 |  |  | 2017 |  |  | 2016
Expected volatility |  |  | 41% |  |  | 44% |  |  | 53%
Expected dividend yield |  |  | - |  |  | - |  |  | -
Risk-free interest rate |  |  | 1.8% to 2.4% |  |  | 1.1% to 2.2% |  |  | 1.5% to 1.8%
Weighted average expected term (in years) |  |  | 4.8 years |  |  | 4.9 years |  |  | 5.4 years
Weighted average fair value of options granted |  | $ | 5.70 |  | $ | 5.74 |  | $ | 4.17
Stock Purchase Rights |
Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award | Stock Purchase Right activity since March 31, 2015 is summarized as follows:
|  |  |  |  | Weighted |  |  | Weighted
|  |  |  |  | Average |  |  | Average
|  |  |  |  | Grant-Date |  |  | Remaining
|  | Number of |  |  | Fair Market |  |  | Contractual
|  | Shares |  |  | Value |  |  | Term (in Years)
Balance at March 31, 2015 |  | 223,835 |  | $ | 5.92 |  |  | 1.50
Granted |  | - |  |  | - |  |  |
Vested and released |  | (115,789) |  |  | 5.32 |  |  |
Forfeited |  | (25,875) |  |  | 7.40 |  |  |
Balance at March 31, 2016 |  | 82,171 |  |  | 6.30 |  |  | 0.76
Granted |  | - |  |  | - |  |  |
Vested and released |  | (69,426) |  |  | 6.00 |  |  |
Forfeited |  | (1,375) |  |  | 6.72 |  |  |
Balance at March 31, 2017 |  | 11,370 |  |  | 8.10 |  |  | 1.09
Granted |  | - |  |  | - |  |  |
Vested and released |  | (6,395) |  |  | 8.26 |  |  |
Forfeited |  | - |  |  | - |  |  |
Balance at March 31, 2018 |  | 4,975 |  | $ | 7.88 |  |  | 0.10
Restricted Stock Units |
Disclosure Of Share-Based Compensation Arrangements By Share-Based Payment Award | Restricted Stock Unit activity since March 31, 2015 is summarized as follows:
|  |  |  |  | Weighted |  |  | Weighted Average
|  | Number of |  |  | Average Grant |  |  | Remaining Contractual
|  | Shares |  |  | Date Fair Value |  |  | Term (in Years)
Balance at March 31, 2015 |  | 2,698,686 |  | $ | 7.33 |  |  | 1.88
Granted |  | 2,681,997 |  |  | 8.78 |  |  |
Vested and released |  | (589,788) |  |  | 7.79 |  |  |
Forfeited |  | (246,096) |  |  | 8.15 |  |  |
Balance at March 31, 2016 |  | 4,544,799 |  |  | 8.08 |  |  | 1.67
Granted |  | 2,491,877 |  |  | 15.15 |  |  |
Vested and released |  | (1,600,831) |  |  | 7.89 |  |  |
Forfeited |  | (496,795) |  |  | 9.56 |  |  |
Balance at March 31, 2017 |  | 4,939,050 |  |  | 11.57 |  |  | 1.55
Granted |  | 3,481,870 |  |  | 14.41 |  |  |
Vested and released |  | (1,833,038) |  |  | 10.27 |  |  |
Forfeited |  | (652,339) |  |  | 12.73 |  |  |
Balance at March 31, 2018 |  | 5,935,543 |  | $ | 13.51 |  |  | 1.60

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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