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Stock-Based Compensation - Stock Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense, pre-tax | $ 22,701 | $ 14,477 | $ 14,774
Income tax benefit | (5,441) | (3,308) | (3,546)
Total stock-based compensation expense, net of tax | 17,260 | 11,169 | 11,228
Annual RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense, pre-tax | 7,820 | 6,509 | 6,588
Annual PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense, pre-tax | 1,900 | 2,851 | 2,373
LTIP PSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense, pre-tax | 11,555 | 2,203 | 885
LTIP NQSOs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense, pre-tax | 0 | 1,641 | 3,516
Grants to Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense, pre-tax | 1,195 | 1,045 | 1,223
Employee Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense, pre-tax | $ 231 | $ 228 | $ 189
Number of shares authorized (in shares) | 1,000,000 |  |
Award purchase period | 6 months |  |
Discount from market price | 15.00% |  |

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