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Stock-based Compensation - Equity Incentive Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 01, 2010 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Repurchase of common stock |  | $ 417,641 | $ 224,451 | $ 419,291
Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Repurchase of common stock (in shares) |  | 3,200,000 | 2,100,000 |
Repurchase of common stock |  | $ 372,800 | $ 196,200 |
Equity Incentive Plan Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options outstanding, unvested (in shares) |  | 200,000 | 400,000 |
Outstanding, weighted average grant date fair value (in dollars per share) |  | $ 18.45 | $ 15.61 |
Stock options outstanding (in shares) |  | 800,000 | 1,100,000 |
Outstanding, weighted average exercise price (in dollars per share) |  | $ 67.98 | $ 60.55 |
Restricted stock granted (in shares) |  | 982,447 |  |
Repurchase of common stock (in shares) |  | 300,000 |  |
Repurchase of common stock |  | $ 42,300 |  |
Restricted Stock and Other Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option vesting period | 3 years |  |  |
Equity Incentive Plan Options | Equity Incentive Plan Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options available for future grant (in shares) |  | 6,000,000 | 7,700,000 |
Stock option expiration period |  | 10 years |  |
Stock option vesting period |  | 5 years |  |
Restricted Stock and Other Awards | Equity Incentive Plan Options | Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate fair value of all awards issued |  | $ 86,200 | $ 70,200 |
Restricted Stock and Other Awards | Equity Incentive Plan Options | Director | Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option vesting period |  | 1 year |  |
Restricted Stock and Other Awards | Restricted Stock and Other Awards | Officer | 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 |  |
Restricted Stock and Other Awards | Restricted Stock and Other Awards | Director | Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option vesting period |  | 3 years |  |
Restricted Stock Units (RSUs) | Equity Incentive Plan Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option vesting period |  | 3 years |  |
Restricted Stock Units (RSUs) | Equity Incentive Plan Options | Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock granted (in shares) |  | 1,000,000 |  |
Aggregate fair value of all awards issued |  | $ 97,200 |  |

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