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Stock-Based Compensation - Stock Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation, pre-tax | $ 26,897 | $ 26,816 | $ 22,701
Income tax benefit | (6,557) | (6,496) | (5,441)
Total stock-based compensation, net of tax | $ 20,340 | 20,320 | 17,260
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized (in shares) | 1,000,000 |  |
Award purchase period (in months) | 6 months |  |
Discount from market price | 15.00% |  |
Total stock-based compensation, pre-tax | $ 510 | 351 | 231
RSUs, PSUs, LTIP PSUs And Grants To Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation, pre-tax | 26,387 | 26,465 | 22,470
RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation, pre-tax | 13,249 | 12,093 | 7,820
PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation, pre-tax | 0 | 0 | 1,900
LTIP PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation, pre-tax | 11,275 | 12,865 | 11,555
Grants to Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation, pre-tax | $ 1,863 | $ 1,507 | $ 1,195

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