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Stockholders' Equity - LTIP NQSOs (Details) - Stock Incentive Plan 2015 - LTIP NQSOs - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Number of Shares |  |  |
Number of shares outstanding beginning of period (in shares) | 192 | 0 |
Granted (in shares) | 205 | 208 |
Forfeited (in shares) |  | (16) |
Number of shares outstanding end of period (in shares) | 397 | 192 | 0
Weighted- Average Grant-Date Fair Value |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 61.86 | $ 0.00 |
Granted (in dollars per share) | 69.29 | 61.86 |
Forfeited (in dollars per share) |  | 61.86 |
Outstanding at the end of the period (in dollars per share) | $ 65.70 | $ 61.86 | $ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Weighted- Average Remaining Contractual Term (Years) | 7 years 29 days | 9 years 4 days | 0 years
Aggregate Intrinsic Value | $ 9,700 | $ 0 | $ 0
2017 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Award vesting period (in years) | 9 years |  |
2018 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |
Award vesting period (in years) | 7 years |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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