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Stock-based Compensation - Summary of Stock Plans (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2010 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Repurchase of common stock |  | $ 224,451 | $ 419,291 | $ 318,068
Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Repurchase of common stock (in shares) |  | 2,100,000 | 4,700,000 |
EIP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options granted (in shares) |  | 300,000 | 100,000 |
Grant date fair value of options granted during period |  | $ 4,400 | $ 1,600 |
Fair value of options vested |  | 2,400 | 2,400 |
Intrinsic value of options exercised |  | $ 19,100 | $ 11,400 |
Stock options outstanding, unvested (in shares) |  | 400,000 | 300,000 |
Outstanding, weighted average grant date fair value (in dollars per share) |  | $ 15.61 | $ 12.73 |
Stock options outstanding (in shares) |  | 1,100,000 | 1,300,000 |
Outstanding, weighted average exercise price (in dollars per share) |  | $ 60.55 | $ 49.34 |
Restricted stock granted (in shares) |  | 1,184,107 |  |
Repurchase of common stock (in shares) |  | 300,000 |  |
Repurchase of common stock |  | $ 28,200 |  |
EIP | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options available for future grant (in shares) |  | 7,700,000 | 8,600,000 |
Stock option expiration period |  | 10 years |  |
Stock option vesting period |  | 5 years |  |
EIP | Restricted Stock | Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate fair value of all awards issued |  | $ 70,200 | $ 59,600 |
EIP | Restricted Stock Units (RSUs) | Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock granted (in shares) |  | 1,200,000 |  |
Aggregate fair value of all awards issued |  | $ 102,100 |  |
Annual Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option vesting period | 3 years |  |  |
Officer | Annual Incentive Plan | Restricted Stock | Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option vesting period |  | 3 years |  |
Stock issued upon conversion (in shares) |  | 1 |  |
Director | EIP | Restricted Stock | Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option vesting period |  | 1 year |  |

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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://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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