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Stock-based Compensation - Equity Incentive Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Repurchase of common stock | [1] | $ 804.0 | $ 418.0 | $ 225.0
Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Repurchase of common stock (in shares) |  | 5,600,000 | 3,200,000 | 2,100,000
Repurchase of common stock |  | $ 764.0 | $ 373.0 | $ 196.0
Amended and Restated Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options outstanding, unvested (in shares) |  | 100,000 | 200,000 |
Outstanding, weighted average grant date fair value (in dollars per share) |  | $ 20.60 | $ 18.45 |
Stock options outstanding (in shares) |  | 700,000 | 800,000 |
Outstanding, weighted average exercise price (in dollars per share) |  | $ 69.88 | $ 67.98 |
Restricted stock granted (in shares) |  | 684,649 |  |
Repurchase of common stock (in shares) |  | 300,000 |  |
Repurchase of common stock |  | $ 33.4 |  |
Employee Stock Option | Amended and Restated Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options available for future grant (in shares) |  | 5,100,000 | 6,000,000.0 |
Stock option expiration period |  | 10 years |  |
Stock option vesting period |  | 5 years |  |
Restricted Stock | Amended and Restated Equity Incentive Plan | Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate fair value of all awards issued |  | $ 81.0 | $ 86.0 |
Restricted Stock | Amended and Restated Equity Incentive Plan | Director | Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option vesting period |  | 1 year |  |
Restricted Stock | Annual Incentive Plan | 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 | Annual Incentive Plan | 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) | Amended and Restated Equity Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option vesting period |  | 3 years |  |
Restricted Stock Units (RSUs) | Amended and Restated Equity Incentive Plan | Class A Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock granted (in shares) |  | 700,000 |  |
Aggregate fair value of all awards issued |  | $ 104.0 |  |
[1] | During fiscal 2025, 2024, and 2023, the Company purchased 5.6 million, 3.2 million and 2.1 million shares, respectively, of the Company’s Class A Common Stock for $764 million, $373 million, and $196 million, respectively. Additionally, during fiscal 2025, 2024, and 2023, the Company repurchased shares for $40 million, $45 million and $29 million, respectively, to cover the minimum statutory taxes on repurchases and restricted stock units that vested on various dates during those years.

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