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Accumulated Other Comprehensive Loss, Reclassification out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2019 | Jul. 31, 2018
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |
Pension expense | $ (2,420) | $ (2,047)
Unamortized Retirement Costs [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |
Pension expense |  | $ 1,400
Unamortized Retirement Costs [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] | Operating and Administrative Expenses [Member] |  |
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |
Pension expense | $ 1,300 |

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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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