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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Jul. 31, 2018
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, 2018 and 2017 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 |  |  | (40,325 | ) |  |  | 7,720 |  |  |  | 70 |  |  |  | (32,535 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 1,091 |  |  |  | (722 | ) |  |  | 369 |
Total other comprehensive (loss) income |  |  | (40,325 | ) |  |  | 8,811 |  |  |  | (652 | ) |  |  | (32,166 | )
Balance at July 31, 2018 |  | $ | (291,898 | ) |  | $ | (182,215 | ) |  | $ | 2,367 |  |  | $ | (471,746 | )
Balance at April 30, 2017 |  | $ | (319,212 | ) |  | $ | (190,502 | ) |  | $ | 2,427 |  |  | $ | (507,287 | )
Other comprehensive income (loss) before reclassifications |  |  | 27,405 |  |  |  | (3,017 | ) |  |  | (432 | ) |  |  | 23,956 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 1,070 |  |  |  | 71 |  |  |  | 1,141 |
Total other comprehensive income (loss) |  |  | 27,405 |  |  |  | (1,947 | ) |  |  | (361 | ) |  |  | 25,097 |
Balance at July 31, 2017 |  | $ | (291,807 | ) |  | $ | (192,449 | ) |  | $ | 2,066 |  |  | $ | (482,190 | )

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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=114867106&loc=SL7669686-108580 + Details
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