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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Jan. 31, 2021
Accumulated Other Comprehensive Loss [Abstract] |
Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax | Changes in Accumulated Other Comprehensive Loss by component, net of tax, for the three and nine months ended January 31, 2021 and 2020 were as follows:
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
Balance at October 31, 2020 |  | $ | (305,476 | ) |  | $ | (230,182 | ) |  | $ | (5,984 | ) |  | $ | (541,642 | )
Other comprehensive income (loss) before reclassifications |  |  | 48,305 |  |  |  | (8,237 | ) |  |  | (381 | ) |  |  | 39,687 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 1,463 |  |  |  | 963 |  |  |  | 2,426 |
Total other comprehensive income (loss) |  |  | 48,305 |  |  |  | (6,774 | ) |  |  | 582 |  |  |  | 42,113 |
Balance at January 31, 2021 |  | $ | (257,171 | ) |  | $ | (236,956 | ) |  | $ | (5,402 | ) |  | $ | (499,529 | )
Balance at April 30, 2020 |  | $ | (340,703 | ) |  | $ | (227,920 | ) |  | $ | (6,874 | ) |  | $ | (575,497 | )
Other comprehensive income (loss) before reclassifications |  |  | 83,532 |  |  |  | (13,527 | ) |  |  | (1,302 | ) |  |  | 68,703 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 4,491 |  |  |  | 2,774 |  |  |  | 7,265 |
Total other comprehensive income (loss) |  |  | 83,532 |  |  |  | (9,036 | ) |  |  | 1,472 |  |  |  | 75,968 |
Balance at January 31, 2021 |  | $ | (257,171 | ) |  | $ | (236,956 | ) |  | $ | (5,402 | ) |  | $ | (499,529 | )
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
Balance at October 31, 2019 |  | $ | (309,327 | ) |  | $ | (194,465 | ) |  | $ | (1,234 | ) |  | $ | (505,026 | )
Other comprehensive income (loss) before reclassifications |  |  | 7,895 |  |  |  | (2,063 | ) |  |  | (271 | ) |  |  | 5,561 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 1,247 |  |  |  | (122 | ) |  |  | 1,125 |
Total other comprehensive income (loss) |  |  | 7,895 |  |  |  | (816 | ) |  |  | (393 | ) |  |  | 6,686 |
Balance at January 31, 2020 |  | $ | (301,432 | ) |  | $ | (195,281 | ) |  | $ | (1,627 | ) |  | $ | (498,340 | )
Balance at April 30, 2019 |  | $ | (312,107 | ) |  | $ | (196,057 | ) |  | $ | (574 | ) |  | $ | (508,738 | )
Other comprehensive income (loss) before reclassifications |  |  | 10,675 |  |  |  | (2,893 | ) |  |  | (424 | ) |  |  | 7,358 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 3,669 |  |  |  | (629 | ) |  |  | 3,040 |
Total other comprehensive income (loss) |  |  | 10,675 |  |  |  | 776 |  |  |  | (1,053 | ) |  |  | 10,398 |
Balance at January 31, 2020 |  | $ | (301,432 | ) |  | $ | (195,281 | ) |  | $ | (1,627 | ) |  | $ | (498,340 | )

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