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Accumulated Other Comprehensive Income (Loss) | 12 Months Ended
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Mar. 31, 2025
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) All amounts recorded in other comprehensive income (loss) (“OCI”) are related to the Company's post-retirement plans and interest rate swaps designated as cash flow hedges. The following table presents the changes in Accumulated OCI:
| Post-retirement plans | Derivatives designated as cash flow hedges | Total
Balance at March 31, 2022 | $ | 9 |  | $ | — |  | $ | 9 |
OCI, before reclassifications to earnings and income taxes | 15 |  | 15 |  | 30 |
Income taxes | (4) |  | (4) |  | (8) |
OCI before reclassifications to earnings, net of income taxes | 11 |  | 11 |  | 22 |
Amounts reclassified from AOCI to earnings, before income taxes | — |  | (1) |  | (1) |
Income taxes | — |  | — |  | — |
Amounts reclassified from AOCI to earnings, net of income taxes(1) | — |  | (1) |  | (1) |
Current-period OCI, net of income taxes | 11 |  | 10 |  | 21 |
Balance at March 31, 2023 | $ | 20 |  | $ | 10 |  | $ | 30 |
OCI, before reclassifications to earnings and income taxes | (21) |  | 12 |  | (9) |
Income taxes | 4 |  | (3) |  | 1 |
OCI before reclassifications to earnings, net of income taxes | (17) |  | 9 |  | (8) |
Amounts reclassified from AOCI to earnings, before income taxes | (2) |  | (15) |  | (17) |
Income taxes | 1 |  | 4 |  | 5 |
Amounts reclassified from AOCI to earnings, net of income taxes(1) | (1) |  | (11) |  | (12) |
Current-period OCI, net of income taxes | (18) |  | (2) |  | (20) |
Balance at March 31, 2024 | $ | 2 |  | $ | 8 |  | $ | 10 |
OCI, before reclassifications to earnings and income taxes | (42) |  | (2) |  | (44) |
Income taxes | 11 |  | 1 |  | 12 |
OCI before reclassifications to earnings, net of income taxes | (31) |  | (1) |  | (32) |
Amounts reclassified from AOCI to earnings, before income taxes (1) | 1 |  | (10) |  | (9) |
Income taxes | — |  | 2 |  | 2 |
Amounts reclassified from AOCI to earnings, net of income taxes | 1 |  | (8) |  | (7) |
Current-period OCI, net of income taxes | (30) |  | (9) |  | (39) |
Balance at March 31, 2025 | $ | (28) |  | $ | (1) |  | $ | (29) |
(1)The reclassifications from accumulated OCI to net income are included in interest expense, net in the Consolidated Statements of Operations.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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