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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Jul. 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 months ended July 31, 2019 and 2018 were as follows:
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
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 | )
Balance at April 30, 2018 |  | $ | (251,573 | ) |  | $ | (191,026 | ) |  | $ | 3,019 |  |  | $ | (439,580 | )
Other comprehensive income (loss) before reclassifications |  |  | (40,325 | ) |  |  | 7,720 |  |  |  | 70 |  |  |  | (32,535 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 1,091 |  |  |  | (722 | ) |  |  | 369 |
Total other comprehensive income (loss) |  |  | (40,325 | ) |  |  | 8,811 |  |  |  | (652 | ) |  |  | (32,166 | )
Balance at July 31, 2018 |  | $ | (291,898 | ) |  | $ | (182,215 | ) |  | $ | 2,367 |  |  | $ | (471,746 | )

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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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