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Shareholders' Equity (Share Repurchase Program) (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Share Repurchase Program [Line Items] |  |  |
Number of shares repurchased (in shares) | 6,700 |  |
Aggregate cost of shares repurchased | $ 588,028 | $ 523,751 | $ 418,346
2023 Share Repurchase Program |  |  |
Share Repurchase Program [Line Items] |  |  |
Number of shares repurchased (in shares) | 6,679 | 4,459 | 0
Aggregate cost of shares repurchased | $ 588,028 | $ 364,639 | $ 0
Shares repurchased for cancellation (in shares) |  | 4,100 |
Shares repurchased for cancellation |  | $ 332,100 |
Aggregate cost of shares repurchased but not yet paid | $ 18,700 | $ 19,500 |
2020 Share Repurchase Program |  |  |
Share Repurchase Program [Line Items] |  |  |
Number of shares repurchased (in shares) | 0 | 2,641 | 7,562
Aggregate cost of shares repurchased | $ 0 | $ 159,112 | $ 418,346

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