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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Jul. 31, 2020
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, 2020 and 2019 were as follows:
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
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 (loss) income |  |  | 46,853 |  |  |  | (5,665 | ) |  |  | 191 |  |  |  | 41,379 |
Balance at July 31, 2020 |  | $ | (293,850 | ) |  | $ | (233,585 | ) |  | $ | (6,683 | ) |  | $ | (534,118 | )
Balance at April 30, 2019 |  | $ | (312,107 | ) |  | $ | (196,057 | ) |  | $ | (574 | ) |  | $ | (508,738 | )
Other comprehensive (loss) income before reclassifications |  |  | (35,539 | ) |  |  | 7,130 |  |  |  | 328 |  |  |  | (28,081 | )
Amounts reclassified from Accumulated Other Comprehensive Loss |  |  | — |  |  |  | 1,038 |  |  |  | (243 | ) |  |  | 795 |
Total other comprehensive (loss) income |  |  | (35,539 | ) |  |  | 8,168 |  |  |  | 85 |  |  |  | (27,286 | )
Balance at July 31, 2019 |  | $ | (347,646 | ) |  | $ | (187,889 | ) |  | $ | (489 | ) |  | $ | (536,024 | )

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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=121641772&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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