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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Oct. 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 six months ended October 31, 2021 and 2020 were as follows:
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
Balance at July 31, 2021 |  | $ | (263,878 | ) |  | $ | (226,557 | ) |  | $ | (4,165 | ) |  | $ | (494,600 | )
Other comprehensive (loss) income before reclassifications |  |  | (9,483 | ) |  |  | 2,639 |  |  |  | 978 |  |  |  | (5,866 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 1,426 |  |  |  | 831 |  |  |  | 2,257 |
Total other comprehensive (loss) income |  |  | (9,483 | ) |  |  | 4,065 |  |  |  | 1,809 |  |  |  | (3,609 | )
Balance at October 31, 2021 |  | $ | (273,361 | ) |  | $ | (222,492 | ) |  | $ | (2,356 | ) |  | $ | (498,209 | )
Balance at April 30, 2021 |  | $ | (257,941 | ) |  | $ | (228,146 | ) |  | $ | (4,703 | ) |  | $ | (490,790 | )
Other comprehensive (loss) income before reclassifications |  |  | (15,420 | ) |  |  | 2,781 |  |  |  | 685 |  |  |  | (11,954 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 2,873 |  |  |  | 1,662 |  |  |  | 4,535 |
Total other comprehensive (loss) income |  |  | (15,420 | ) |  |  | 5,654 |  |  |  | 2,347 |  |  |  | (7,419 | )
Balance at October 31, 2021 |  | $ | (273,361 | ) |  | $ | (222,492 | ) |  | $ | (2,356 | ) |  | $ | (498,209 | )
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
Balance at July 31, 2020 |  | $ | (293,850 | ) |  | $ | (233,585 | ) |  | $ | (6,683 | ) |  | $ | (534,118 | )
Other comprehensive (loss) income before reclassifications |  |  | (11,626 | ) |  |  | 1,900 |  |  |  | (252 | ) |  |  | (9,978 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 1,503 |  |  |  | 951 |  |  |  | 2,454 |
Total other comprehensive (loss) income |  |  | (11,626 | ) |  |  | 3,403 |  |  |  | 699 |  |  |  | (7,524 | )
Balance at October 31, 2020 |  | $ | (305,476 | ) |  | $ | (230,182 | ) |  | $ | (5,984 | ) |  | $ | (541,642 | )
Balance at April 30, 2020 |  | $ | (340,703 | ) |  | $ | (227,920 | ) |  | $ | (6,874 | ) |  | $ | (575,497 | )
Other comprehensive income (loss) before reclassifications |  |  | 35,227 |  |  |  | (5,290 | ) |  |  | (921 | ) |  |  | 29,016 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 3,028 |  |  |  | 1,811 |  |  |  | 4,839 |
Total other comprehensive income (loss) |  |  | 35,227 |  |  |  | (2,262 | ) |  |  | 890 |  |  |  | 33,855 |
Balance at October 31, 2020 |  | $ | (305,476 | ) |  | $ | (230,182 | ) |  | $ | (5,984 | ) |  | $ | (541,642 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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