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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Oct. 31, 2019
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, 2019 and 2018 were as follows:
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
Balance at July 31, 2019 |  | $ | (347,646 | ) |  | $ | (187,889 | ) |  | $ | (489 | ) |  | $ | (536,024 | )
Other comprehensive income (loss) before reclassifications |  |  | 38,319 |  |  |  | (7,960 | ) |  |  | (481 | ) |  |  | 29,878 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 1,384 |  |  |  | (264 | ) |  |  | 1,120 |
Total other comprehensive income (loss) |  |  | 38,319 |  |  |  | (6,576 | ) |  |  | (745 | ) |  |  | 30,998 |
Balance at October 31, 2019 |  | $ | (309,327 | ) |  | $ | (194,465 | ) |  | $ | (1,234 | ) |  | $ | (505,026 | )
Balance at April 30, 2019 |  | $ | (312,107 | ) |  | $ | (196,057 | ) |  | $ | (574 | ) |  | $ | (508,738 | )
Other comprehensive income (loss) before reclassifications |  |  | 2,780 |  |  |  | (830 | ) |  |  | (153 | ) |  |  | 1,797 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 2,422 |  |  |  | (507 | ) |  |  | 1,915 |
Total other comprehensive income (loss) |  |  | 2,780 |  |  |  | 1,592 |  |  |  | (660 | ) |  |  | 3,712 |
Balance at October 31, 2019 |  | $ | (309,327 | ) |  | $ | (194,465 | ) |  | $ | (1,234 | ) |  | $ | (505,026 | )
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
Balance at July 31, 2018 |  | $ | (291,898 | ) |  | $ | (182,215 | ) |  | $ | 2,367 |  |  | $ | (471,746 | )
Other comprehensive income (loss) before reclassifications |  |  | (20,424 | ) |  |  | 3,273 |  |  |  | 543 |  |  |  | (16,608 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 1,114 |  |  |  | (1,324 | ) |  |  | (210 | )
Total other comprehensive income (loss) |  |  | (20,424 | ) |  |  | 4,387 |  |  |  | (781 | ) |  |  | (16,818 | )
Balance at October 31, 2018 |  | $ | (312,322 | ) |  | $ | (177,828 | ) |  | $ | 1,586 |  |  | $ | (488,564 | )
Balance at April 30, 2018 |  | $ | (251,573 | ) |  | $ | (191,026 | ) |  | $ | 3,019 |  |  | $ | (439,580 | )
Other comprehensive income (loss) before reclassifications |  |  | (60,749 | ) |  |  | 10,993 |  |  |  | 613 |  |  |  | (49,143 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 2,205 |  |  |  | (2,046 | ) |  |  | 159 |
Total other comprehensive income (loss) |  |  | (60,749 | ) |  |  | 13,198 |  |  |  | (1,433 | ) |  |  | (48,984 | )
Balance at October 31, 2018 |  | $ | (312,322 | ) |  | $ | (177,828 | ) |  | $ | 1,586 |  |  | $ | (488,564 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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=118930883&loc=SL7669686-108580 + Details
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