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Stock-Based Compensation - Long-Term Incentive Plan Awards (Details) - $ / shares | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Measurement period |  |  |  | 3 years |  |
2021 | LTIP PSUs | 2015 SIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  |  | 19,890 |  |
Granted (in dollars per share) |  |  |  | $ 376.45 |  |
2021 | LTIP PSUs | 2015 SIP | Share-based Payment Arrangement, Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period | 2 years |  |  |  |  |
Award requisite service period | 24 months |  |  |  |  |
2021 | LTIP PSUs | 2015 SIP | Share-based Payment Arrangement, Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period | 3 years |  |  |  |  |
Award requisite service period | 36 months |  |  |  |  |
2021 | Maximum | LTIP PSUs | 2015 SIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights percentage | 200.00% |  |  |  |  |
2021 | Minimum | LTIP PSUs | 2015 SIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Financial performance achievement percentage | 100.00% |  |  |  |  |
2020 | LTIP PSUs | 2015 SIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |
Award requisite service period |  | 36 months |  |  |  |
Granted (in shares) |  |  |  |  | 38,174 |
Granted (in dollars per share) |  |  |  |  | $ 146.96 |
2020 | Maximum | LTIP PSUs | 2015 SIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights percentage |  | 200.00% |  |  |  |
2020 | Minimum | LTIP PSUs | 2015 SIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Financial performance achievement percentage |  | 90.00% |  |  |  |
2019 | LTIP PSUs | 2015 SIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |
Award requisite service period |  |  | 36 months |  |  |
Granted (in shares) |  |  |  |  |  | 41,793
Granted (in dollars per share) |  |  |  |  |  | $ 120.24
2019 | Maximum | LTIP PSUs | 2015 SIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights percentage |  |  | 200.00% | 200.00% |  |
2019 | Minimum | LTIP PSUs | 2015 SIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Financial performance achievement percentage |  |  | 90.00% |  |  |

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Financial Performance Achievement Percentage + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Percentage of vesting of award under share-based payment arrangement. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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