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Share-Based Compensation (Tables) | 12 Months Ended
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Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Restricted Shares | A summary of the Company’s RSUs granted under the Plan is presented below:
RSUs |  | Shares (in thousands) |  | Weighted-Average Grant-Date Fair Value
Vested and Nonvested at March 31, 2014 |  | 437.5 |  |  | $ | 16.76 |
Granted |  | 106.9 |  |  | 33.33 |
Vested and issued |  | (154.4 | ) |  | 13.37 |
Forfeited |  | (27.7 | ) |  | 21.45 |
Vested and nonvested at March 31, 2015 |  | 362.3 |  |  | 22.74 |
Vested at March 31, 2015 |  | 76.6 |  |  | 11.62 |
Granted |  | 266.1 |  |  | 42.41 |
Vested and issued |  | (155.6 | ) |  | 18.31 |
Forfeited |  | (5.0 | ) |  | 39.61 |
Vested and nonvested at March 31, 2016 |  | 467.8 |  |  | 35.22 |
Vested at March 31, 2016 |  | 69.8 |  |  | 14.76 |
Granted |  | 68.4 |  |  | 55.44 |
Vested and issued |  | (94.7 | ) |  | 28.51 |
Forfeited |  | (91.4 | ) |  | 41.71 |
Vested and nonvested at March 31, 2017 |  | 350.1 |  |  | 39.29 |
Vested at March 31, 2017 |  | 63.4 |  |  | 20.12 |
Stock Options, Valuation Assumptions | The weighted-average grant-date fair values of the options granted during 2017, 2016, and 2015 were $21.75, $17.24, and $15.95, respectively.
| Year Ended March 31,
| 2017 |  | 2016 |  | 2015
Expected volatility | 37.8 | % |  | 40.2 | % |  | 47.3 | %
Expected dividends | — |  |  | — |  |  | — |
Expected term in years | 6.0 |  |  | 6.0 |  |  | 6.0 |
Risk-free rate | 1.7 | % |  | 1.7 | % |  | 2.2 | %
Stock Option Activity | A summary of option activity under the Plan is as follows:
Options |  | Shares (in thousands) |  | Weighted-Average Exercise Price |  | Weighted- Average Remaining Contractual Term |  | Aggregate Intrinsic Value (in thousands)
Outstanding at March 31, 2014 |  | 994.9 |  |  | $ | 15.24 |  |  |  |  |
Granted |  | 317.9 |  |  | 33.54 |  |  |  |  |
Exercised |  | (386.3 | ) |  | 10.24 |  |  |  |  |
Forfeited or expired |  | (55.3 | ) |  | 26.77 |  |  |  |  |
Outstanding at March 31, 2015 |  | 871.2 |  |  | 23.40 |  |  |  |  |
Granted |  | 208.2 |  |  | 42.13 |  |  |  |  |
Exercised |  | (348.0 | ) |  | 19.22 |  |  |  |  |
Forfeited or expired |  | (3.7 | ) |  | 35.72 |  |  |  |  |
Outstanding at March 31, 2016 |  | 727.7 |  |  | 30.70 |  |  |  |  |
Granted |  | 264.3 |  |  | 55.86 |  |  |  |  |
Exercised |  | (126.8 | ) |  | 31.75 |  |  |  |  |
Forfeited or expired |  | (92.9 | ) |  | 42.66 |  |  |  |  |
Outstanding at March 31, 2017 |  | 772.3 |  |  | 37.70 |  |  | 7.3 |  | $ | 14,118 |
Exercisable at March 31, 2017 |  | 367.4 |  |  | 25.40 |  |  | 6.0 |  | $ | 11,083 |

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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 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
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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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