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Accumulated Other Comprehensive Loss (Table Text Block) | 6 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Table Text Block Supplement [Abstract] |  |
Summary of Accumulated Other Comprehensive Income (Loss) Components, Net of Tax |
|  | Foreign Currency Translation |  |  | Unrealized Net Gains (Losses) on Investments and Impact of LFPB (a) Discount Rates |  |  | Fair Value of Cash Flow Hedges |  |  | Postretirement Benefit Obligation Net Loss |  |  | Accumulated Other Comprehensive Loss |
|  | (Unaudited) |
|  | (In thousands) |
Balance as of March 31, 2024 |  | $ | (53,707 | ) |  | $ | (176,883 | ) |  | $ | 6,330 |  |  | $ | 1,044 |  |  | $ | (223,216 | )
Foreign currency translation |  |  | 217 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 217 |
Unrealized net loss on investments and impact of LFBP discount rates |  |  | — |  |  |  | (9,445 | ) |  |  | — |  |  |  | — |  |  |  | (9,445 | )
Change in fair value of cash flow hedges |  |  | — |  |  |  | — |  |  |  | (209 | ) |  |  | — |  |  |  | (209 | )
Amounts reclassified into earnings on hedging activities |  |  | — |  |  |  | — |  |  |  | (8,178 | ) |  |  | — |  |  |  | (8,178 | )
Other comprehensive income (loss) |  |  | 217 |  |  |  | (9,445 | ) |  |  | (8,387 | ) |  |  | — |  |  |  | (17,615 | )
Balance as of September 30, 2024 |  | $ | (53,490 | ) |  | $ | (186,328 | ) |  | $ | (2,057 | ) |  | $ | 1,044 |  |  | $ | (240,831 | )
|  | Foreign Currency Translation |  |  | Unrealized Net Gains (Losses) on Investments and Impact of LFPB (a) Discount Rates |  |  | Fair Value of Cash Flow Hedges |  |  | Postretirement Benefit Obligation Net Loss |  |  | Accumulated Other Comprehensive Loss |
|  | (Unaudited) |
|  | (In thousands) |
Balance as of March 31, 2023 |  | $ | (56,539 | ) |  | $ | (232,740 | ) |  | $ | 4,007 |  |  | $ | (351 | ) |  | $ | (285,623 | )
Foreign currency translation |  |  | (2,380 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (2,380 | )
Unrealized net gain on investments and impact of LFBP discount rates |  |  | — |  |  |  | 7,047 |  |  |  | — |  |  |  | — |  |  |  | 7,047 |
Change in fair value of cash flow hedges |  |  | — |  |  |  | — |  |  |  | 7,175 |  |  |  | — |  |  |  | 7,175 |
Amounts reclassified into earnings on hedging activities |  |  | — |  |  |  | — |  |  |  | (1,883 | ) |  |  | — |  |  |  | (1,883 | )
Other comprehensive income (loss) |  |  | (2,380 | ) |  |  | 7,047 |  |  |  | 5,292 |  |  |  | — |  |  |  | 9,959 |
Balance as of September 30, 2023 |  | $ | (58,919 | ) |  | $ | (225,693 | ) |  | $ | 9,299 |  |  | $ | (351 | ) |  | $ | (275,664 | )

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