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Accumulated Other Comprehensive Income (Tables) | 6 Months Ended
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Sep. 30, 2023
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income | The following table shows the changes in accumulated other comprehensive loss, net of tax:
| 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(1) | — |  | 2,344 |  | 2,344 |  | — |  | 8,700 |  | 8,700 |
Amounts reclassified from accumulated other comprehensive income | (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 |
(1) Changes in other comprehensive income before reclassification for derivatives designated as cash flow hedges are recorded net of ta x expense of $0.8 million and $3.1 million for the three and six months ended September 30, 2023, respectively. The tax impact of other comprehensive income before reclassification for post-retirement plans for the three and six months ended September 30, 2023 was immaterial.
| Three Months Ended September 30, 2022 | Six Months Ended September 30, 2022
| Post-retirement plans | Derivatives designated as cash flow hedges | Totals | Post-retirement plans | Derivatives designated as cash flow hedges | Totals
Beginning of period | $ | 8,809 |  | $ | 5,533 |  | $ | 14,342 |  | $ | 8,811 |  | $ | (226) |  | $ | 8,585 |
Other comprehensive income before reclassifications(2) | — |  | 7,514 |  | 7,514 |  | (1) |  | 11,181 |  | 11,180 |
Amounts reclassified from accumulated other comprehensive income (loss) | (2) |  | 287 |  | 285 |  | (3) |  | 2,379 |  | 2,376 |
Net current-period other comprehensive (loss) income | (2) |  | 7,801 |  | 7,799 |  | (4) |  | 13,560 |  | 13,556 |
End of period | $ | 8,807 |  | $ | 13,334 |  | $ | 22,141 |  | $ | 8,807 |  | $ | 13,334 |  | $ | 22,141 |
(2) Changes in other comprehensive income before reclassification for derivatives designated as cash flow hedges are recorded net of tax expense of $2.7 million and $4.0 million for the three and six months ended September 30, 2022. The tax impact of other comprehensive income before reclassification for post-retirement plans for the three and six months ended September 30, 2022 was immaterial.

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