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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2021 | Jul. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance | $ 1,091,291 | $ 933,624
Other comprehensive (loss) income before reclassifications | (6,088) | 38,994
Amounts reclassified from Accumulated other comprehensive loss | 2,278 | 2,385
Total other comprehensive (loss) income | (3,810) | 41,379
Balance | 1,077,905 | 973,745
Accumulated Other Comprehensive Loss [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance | (490,790) | (575,497)
Balance | (494,600) | (534,118)
Foreign Currency Translation [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance | (257,941) | (340,703)
Other comprehensive (loss) income before reclassifications | (5,937) | 46,853
Amounts reclassified from Accumulated other comprehensive loss | 0 | 0
Total other comprehensive (loss) income | (5,937) | 46,853
Balance | (263,878) | (293,850)
Unamortized Retirement Costs [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance | (228,146) | (227,920)
Other comprehensive (loss) income before reclassifications | 142 | (7,190)
Amounts reclassified from Accumulated other comprehensive loss | 1,447 | 1,525
Total other comprehensive (loss) income | 1,589 | (5,665)
Balance | (226,557) | (233,585)
Interest Rate Swaps [Member] |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balance | (4,703) | (6,874)
Other comprehensive (loss) income before reclassifications | (293) | (669)
Amounts reclassified from Accumulated other comprehensive loss | 831 | 860
Total other comprehensive (loss) income | 538 | 191
Balance | $ (4,165) | $ (6,683)

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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=124507222&loc=d3e1436-108581 Reference 2: 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=124509347&loc=SL7669686-108580 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74512-122707 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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