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Stock-Based Compensation - Narrative (Details) - Stock Incentive Plan 2015 - USD ($) $ in Thousands | 6 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Options granted (in shares) | 0 |
LTIP Performance Based PSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted (in shares) | 0 |
Stock Appreciation Rights |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted (in shares) | 0 |
Annual RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted (in shares) | 34,211 | 38,307
Award vesting period (in years) | 3 years |
Annual PSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted (in shares) | 0 | 19,938
Award vesting period (in years) | 3 years |
Annual RSUs and Annual PSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Awards granted (in shares) | 34,211 | 58,245
Unrecognized stock compensation expense | $ 11,219 |

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- Definition Amount of cost not yet recognized for nonvested 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 (i) -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 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=120381028&loc=d3e5070-113901 + Details
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