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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Jan. 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 nine months ended January 31, 2018 and 2017 were as follows:
|  | 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 | )
|  | Foreign Currency Translation |  |  | Unamortized Retirement Costs |  |  | Interest Rate Swaps |  |  | Total |
Balance at October 31, 2016 |  | $ | (338,384 | ) |  | $ | (148,250 | ) |  | $ | (15 | ) |  | $ | (486,649 | )
Other comprehensive income (loss) before reclassifications |  |  | 7,783 |  |  |  | (2,603 | ) |  |  | 2,284 |  |  |  | 7,464 |
Amounts reclassified from accumulated other comprehensive loss |  |  | - |  |  |  | 838 |  |  |  | (70 | ) |  |  | 768 |
Total other comprehensive income (loss) |  |  | 7,783 |  |  |  | (1,765 | ) |  |  | 2,214 |  |  |  | 8,232 |
Balance at January 31, 2017 |  | $ | (330,601 | ) |  | $ | (150,015 | ) |  | $ | 2,199 |  |  | $ | (478,417 | )
Balance at April 30, 2016 |  | $ | (267,920 | ) |  | $ | (179,405 | ) |  | $ | (361 | ) |  | $ | (447,686 | )
Other comprehensive (loss) income before reclassifications |  |  | (62,681 | ) |  |  | 22,891 |  |  |  | 2,381 |  |  |  | (37,409 | )
Amounts reclassified from accumulated other comprehensive loss |  |  | - |  |  |  | 6,499 |  |  |  | 179 |  |  |  | 6,678 |
Total other comprehensive (loss) income |  |  | (62,681 | ) |  |  | 29,390 |  |  |  | 2,560 |  |  |  | (30,731 | )
Balance at January 31, 2017 |  | $ | (330,601 | ) |  | $ | (150,015 | ) |  | $ | 2,199 |  |  | $ | (478,417 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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