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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Jan. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Components of accumulated other comprehensive income (loss) | The components of accumulated other comprehensive income (loss), including the reclassification adjustments for items that are reclassified from accumulated other comprehensive income (loss) to net income, are shown below.
| Foreign Currency Translation Adjustment |  | Net Gains (Losses) on Cash Flow Hedging Derivatives (A) |  | Pension and Other Postretirement Liabilities (B) |  | Unrealized Gain (Loss) on Available- for-Sale Securities |  | Accumulated Other Comprehensive Income (Loss)
Balance at May 1, 2021 | $ | (9.0) |  |  | $ | (174.8) |  |  | $ | (97.3) |  |  | $ | 3.7 |  |  | $ | (277.4) |
Reclassification adjustments | — |  |  | 9.8 |  |  | 12.6 |  |  | — |  |  | 22.4 |
Current period credit (charge) | (9.0) |  |  | — |  |  | (2.0) |  |  | 0.2 |  |  | (10.8) |
Income tax benefit (expense) | — |  |  | (1.4) |  |  | (2.0) |  |  | (0.1) |  |  | (3.5) |
Balance at January 31, 2022 | $ | (18.0) |  |  | $ | (166.4) |  |  | $ | (88.7) |  |  | $ | 3.8 |  |  | $ | (269.3) |
| Foreign Currency Translation Adjustment |  | Net Gains (Losses) on Cash Flow Hedging Derivatives (A) |  | Pension and Other Postretirement Liabilities (B) |  | Unrealized Gain (Loss) on Available- for-Sale Securities |  | Accumulated Other Comprehensive Income (Loss)
Balance at May 1, 2020 | $ | (50.5) |  |  | $ | (185.6) |  |  | $ | (146.7) |  |  | $ | 3.8 |  |  | $ | (379.0) |
Reclassification adjustments | — |  |  | 10.4 |  |  | 39.0 |  |  | — |  |  | 49.4 |
Current period credit (charge) | 29.4 |  |  | — |  |  | 9.5 |  |  | 1.5 |  |  | 40.4 |
Income tax benefit (expense) | — |  |  | (2.2) |  |  | (11.8) |  |  | (0.3) |  |  | (14.3) |
Balance at January 31, 2021 | $ | (21.1) |  |  | $ | (177.4) |  |  | $ | (110.0) |  |  | $ | 5.0 |  |  | $ | (303.5) |
(A)The reclassification is composed of deferred gains (losses) related to terminated interest rate contracts. During both 2022 and 2021, the reclassification was primarily from accumulated other comprehensive income (loss) to interest expense. In addition, during the first quarter of 2022, a portion of the reclassification was to other income (expense) – net, which was driven by the prepayment of the Senior Notes due March 15, 2022. For additional information, see Note 10: Derivative Financial Instruments. (B)The reclassification from accumulated other comprehensive income (loss) to other income (expense) – net is composed of settlement charges and amortization of net losses and prior service costs. The reclassification in 2021 primarily includes the impact of the nonrecurring settlement charge related to the Canadian buy-out contract. For additional information, see Note 9: Pensions and Other Postretirement Benefits.

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