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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Jul. 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 months ended July 31, 2021 and 2020 were as follows:
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
Balance at April 30, 2021 |  | $ | (257,941 | ) |  | $ | (228,146 | ) |  | $ | (4,703 | ) |  | $ | (490,790 | )
Other comprehensive (loss) income before reclassifications |  |  | (5,937 | ) |  |  | 142 |  |  |  | (293 | ) |  |  | (6,088 | )
Amounts reclassified from Accumulated other comprehensive loss |  |  | — |  |  |  | 1,447 |  |  |  | 831 |  |  |  | 2,278 |
Total other comprehensive (loss) income |  |  | (5,937 | ) |  |  | 1,589 |  |  |  | 538 |  |  |  | (3,810 | )
Balance at July 31, 2021 |  | $ | (263,878 | ) |  | $ | (226,557 | ) |  | $ | (4,165 | ) |  | $ | (494,600 | )
Balance at April 30, 2020 |  | $ | (340,703 | ) |  | $ | (227,920 | ) |  | $ | (6,874 | ) |  | $ | (575,497 | )
Other comprehensive income (loss) before reclassifications |  |  | 46,853 |  |  |  | (7,190 | ) |  |  | (669 | ) |  |  | 38,994 |
Amounts reclassified from Accumulated other comprehensive loss |  |  | — |  |  |  | 1,525 |  |  |  | 860 |  |  |  | 2,385 |
Total other comprehensive income (loss) |  |  | 46,853 |  |  |  | (5,665 | ) |  |  | 191 |  |  |  | 41,379 |
Balance at July 31, 2020 |  | $ | (293,850 | ) |  | $ | (233,585 | ) |  | $ | (6,683 | ) |  | $ | (534,118 | )

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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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