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Stock-Based Compensation - LTIP NQSOs (Details) - Stock Incentive Plan 2015 - LTIP NQSOs - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Number of Shares |  |  |  |  |  |  |
Number of shares outstanding beginning of period (in shares) |  |  |  |  | 361,383 | 397,340 | 191,786
Granted (in shares) |  |  |  |  | 0 | 0 | 205,554
Forfeited (in shares) |  |  |  |  |  | (35,957) |
Exercised (in shares) |  |  |  |  | (58,444) |  |
Number of shares outstanding end of period (in shares) | 302,939 | 361,383 | 397,340 | 191,786 | 302,939 | 361,383 | 397,340
Weighted- Average Grant-Date Fair Value |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  |  | $ 65.35 | $ 65.70 | $ 61.86
Granted (in dollars per share) |  |  |  |  |  |  | 69.29
Forfeited (in dollars per share) |  |  |  |  |  | (69.29) |
Exercised (in dollars per share) |  |  |  |  | (61.86) |  |
Outstanding at the end of the period (in dollars per share) | $ 66.02 | $ 65.35 | $ 65.70 | $ 61.86 | $ 66.02 | $ 65.35 | $ 65.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |  |  |  |
Weighted- Average Remaining Contractual Term (Years) | 5 years | 6 years 2 months 12 days | 7 years 1 month 6 days | 9 years |  |  |
Aggregate Intrinsic Value | $ 20,594 | $ 29,504 | $ 9,666 | $ 0 | $ 20,594 | $ 29,504 | $ 9,666

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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