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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Oct. 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 and six months ended October 31, 2018 and 2017 were as follows:
|  | 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 (loss) income before reclassifications |  |  | (20,424 | ) |  |  | 3,273 |  |  |  | 543 |  |  |  | (16,608 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 1,114 |  |  |  | (1,324 | ) |  |  | (210 | )
Total other comprehensive (loss) income |  |  | (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 | )
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
Balance at July 31, 2017 |  | $ | (291,807 | ) |  | $ | (192,449 | ) |  | $ | 2,066 |  |  | $ | (482,190 | )
Other comprehensive income (loss) before reclassifications |  |  | 5,636 |  |  |  | (1,673 | ) |  |  | 238 |  |  |  | 4,201 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 1,094 |  |  |  | 169 |  |  |  | 1,263 |
Total other comprehensive income (loss) |  |  | 5,636 |  |  |  | (579 | ) |  |  | 407 |  |  |  | 5,464 |
Balance at October 31, 2017 |  | $ | (286,171 | ) |  | $ | (193,028 | ) |  | $ | 2,473 |  |  | $ | (476,726 | )
Balance at April 30, 2017 |  | $ | (319,212 | ) |  | $ | (190,502 | ) |  | $ | 2,427 |  |  | $ | (507,287 | )
Other comprehensive income (loss) before reclassifications |  |  | 33,041 |  |  |  | (4,690 | ) |  |  | (194 | ) |  |  | 28,157 |
Amounts reclassified from accumulated other comprehensive loss |  |  | — |  |  |  | 2,164 |  |  |  | 240 |  |  |  | 2,404 |
Total other comprehensive income (loss) |  |  | 33,041 |  |  |  | (2,526 | ) |  |  | 46 |  |  |  | 30,561 |
Balance at October 31, 2017 |  | $ | (286,171 | ) |  | $ | (193,028 | ) |  | $ | 2,473 |  |  | $ | (476,726 | )

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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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