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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Jan. 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 nine months ended January 31, 2019 and 2018 were as follows:
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
Balance at October 31, 2018 |  | $ | (312,322 | ) |  | $ | (177,828 | ) |  | $ | 1,586 |  |  | $ | (488,564 | )
Other comprehensive (loss) income before reclassifications |  |  | 17,515 |  |  |  | (3,141 | ) |  |  | 176 |  |  |  | 14,550 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 1,060 |  |  |  | (1,312 | ) |  |  | (252 | )
Total other comprehensive (loss) income |  |  | 17,515 |  |  |  | (2,081 | ) |  |  | (1,136 | ) |  |  | 14,298 |
Balance at January 31, 2019 |  | $ | (294,807 | ) |  | $ | (179,909 | ) |  | $ | 450 |  |  | $ | (474,266 | )
Balance at April 30, 2018 |  | $ | (251,573 | ) |  | $ | (191,026 | ) |  | $ | 3,019 |  |  | $ | (439,580 | )
Other comprehensive income (loss) before reclassifications |  |  | (43,234 | ) |  |  | 7,852 |  |  |  | 789 |  |  |  | (34,593 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 3,265 |  |  |  | (3,358 | ) |  |  | (93 | )
Total other comprehensive income (loss) |  |  | (43,234 | ) |  |  | 11,117 |  |  |  | (2,569 | ) |  |  | (34,686 | )
Balance at January 31, 2019 |  | $ | (294,807 | ) |  | $ | (179,909 | ) |  | $ | 450 |  |  | $ | (474,266 | )
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
Balance at October 31, 2017 |  | $ | (286,171 | ) |  | $ | (193,028 | ) |  | $ | 2,473 |  |  | $ | (476,726 | )
Other comprehensive income (loss) before reclassifications |  |  | 51,401 |  |  |  | (9,686 | ) |  |  | 509 |  |  |  | 42,224 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 1,099 |  |  |  | 225 |  |  |  | 1,324 |
Total other comprehensive income (loss) |  |  | 51,401 |  |  |  | (8,587 | ) |  |  | 734 |  |  |  | 43,548 |
Balance at January 31, 2018 |  | $ | (234,770 | ) |  | $ | (201,615 | ) |  | $ | 3,207 |  |  | $ | (433,178 | )
Balance at April 30, 2017 |  | $ | (319,212 | ) |  | $ | (190,502 | ) |  | $ | 2,427 |  |  | $ | (507,287 | )
Other comprehensive income (loss) before reclassifications |  |  | 84,442 |  |  |  | (14,376 | ) |  |  | 315 |  |  |  | 70,381 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 3,263 |  |  |  | 465 |  |  |  | 3,728 |
Total other comprehensive income (loss) |  |  | 84,442 |  |  |  | (11,113 | ) |  |  | 780 |  |  |  | 74,109 |
Balance at January 31, 2018 |  | $ | (234,770 | ) |  | $ | (201,615 | ) |  | $ | 3,207 |  |  | $ | (433,178 | )

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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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