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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Apr. 30, 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 years ended April 30, 2021, 2020, and 2019 were as follows:
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
Balance at April 30, 2018 |  | $ | (251,573 | ) |  | $ | (191,026 | ) |  | $ | 3,019 |  |  | $ | (439,580 | )
Other comprehensive (loss) income before reclassifications |  |  | (60,534 | ) |  |  | (9,422 | ) |  |  | 1,121 |  |  |  | (68,835 | )
Amounts reclassified from Accumulated other comprehensive loss |  |  | — |  |  |  | 4,391 |  |  |  | (4,714 | ) |  |  | (323 | )
Total other comprehensive loss |  |  | (60,534 | ) |  |  | (5,031 | ) |  |  | (3,593 | ) |  |  | (69,158 | )
Balance at April 30, 2019 |  | $ | (312,107 | ) |  | $ | (196,057 | ) |  | $ | (574 | ) |  | $ | (508,738 | )
Other comprehensive loss before reclassifications |  |  | (28,596 | ) |  |  | (36,965 | ) |  |  | (5,988 | ) |  |  | (71,549 | )
Amounts reclassified from Accumulated other comprehensive loss |  |  | — |  |  |  | 5,102 |  |  |  | (312 | ) |  |  | 4,790 |
Total other comprehensive loss |  |  | (28,596 | ) |  |  | (31,863 | ) |  |  | (6,300 | ) |  |  | (66,759 | )
Balance at April 30, 2020 |  | $ | (340,703 | ) |  | $ | (227,920 | ) |  | $ | (6,874 | ) |  | $ | (575,497 | )
Other comprehensive income (loss) before reclassifications |  |  | 82,762 |  |  |  | (6,273 | ) |  |  | (639 | ) |  |  | 75,850 |
Amounts reclassified from Accumulated other comprehensive loss |  |  | — |  |  |  | 6,047 |  |  |  | 2,810 |  |  |  | 8,857 |
Total other comprehensive income (loss) |  |  | 82,762 |  |  |  | (226 | ) |  |  | 2,171 |  |  |  | 84,707 |
Balance at April 30, 2021 |  | $ | (257,941 | ) |  | $ | (228,146 | ) |  | $ | (4,703 | ) |  | $ | (490,790 | )

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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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