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Accumulated Other Comprehensive Income / (Loss) (Tables) | 6 Months Ended
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Sep. 30, 2024
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income | The following table shows the changes in accumulated other comprehensive income, net of tax:
| Three Months Ended September 30, 2024 | Six Months Ended September 30, 2024
| Post-retirement plans | Derivatives designated as cash flow hedges | Totals | Post-retirement plans | Derivatives designated as cash flow hedges | Totals
Beginning of period | $ | 2,087 |  | $ | 5,316 |  | $ | 7,403 |  | $ | 1,976 |  | $ | 7,556 |  | $ | 9,532 |
Other comprehensive loss before reclassifications(1) | — |  | (5,788) |  | (5,788) |  | — |  | (5,240) |  | (5,240) |
Amounts reclassified from accumulated other comprehensive income (2) | 112 |  | (2,003) |  | (1,891) |  | 223 |  | (4,791) |  | (4,568) |
Net current-period other comprehensive income (loss) | 112 |  | (7,791) |  | (7,679) |  | 223 |  | (10,031) |  | (9,808) |
End of period | $ | 2,199 |  | $ | (2,475) |  | $ | (276) |  | $ | 2,199 |  | $ | (2,475) |  | $ | (276) |
(1) Changes in other comprehensive income / (loss) before reclassification for derivatives designated as cash flow hedges are recorded net of ta x benefit of $2.0 million and $1.8 million for the three and six months ended September 30, 2024, respectively. The tax impact of other comprehensive income before reclassification for post-retirement plans for the three and six months ended September 30, 2024 was immaterial. (2) The reclassifications from accumulated other comprehensive income to net income for derivatives designated as cash flow hedges are recorded net of tax expense of $0.7 million and $1.7 million for the three and six months ended September 30, 2024, respectively. The tax impact of reclassifications from accumulated other comprehensive loss to net income for post-retirement plans for the three and six months ended September 30, 2024 was immaterial.
| Three Months Ended September 30, 2023 | Six Months Ended September 30, 2023
| Post-retirement plans | Derivatives designated as cash flow hedges | Totals | Post-retirement plans | Derivatives designated as cash flow hedges | Totals
Beginning of period | $ | 19,067 |  | $ | 13,624 |  | $ | 32,691 |  | $ | 19,450 |  | $ | 9,883 |  | $ | 29,333 |
Other comprehensive income before reclassifications(3) | — |  | 2,344 |  | 2,344 |  | — |  | 8,700 |  | 8,700 |
Amounts reclassified from accumulated other comprehensive income(4) | (383) |  | (2,760) |  | (3,143) |  | (766) |  | (5,375) |  | (6,141) |
Net current-period other comprehensive (loss) income | (383) |  | (416) |  | (799) |  | (766) |  | 3,325 |  | 2,559 |
End of period | $ | 18,684 |  | $ | 13,208 |  | $ | 31,892 |  | $ | 18,684 |  | $ | 13,208 |  | $ | 31,892 |
(3) Changes in other comprehensive income before reclassification for derivatives designated as cash flow hedges are recorded net of tax expense of $0.8 million and $3.1 million for the three and six months ended September 30, 2023, respectively. (4) The reclassifications from accumulated other comprehensive income to net income for derivatives designated as cash flow hedges are recorded net of tax expense of $1.0 million and $1.9 million for the three and six months ended September 30, 2023, respectively. The tax impact of reclassifications from accumulated other comprehensive income to net income for post-retirement plans for the three and six months ended September 30, 2023 was immaterial.

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