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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, 2018 | Jul. 31, 2017
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |  |
Operating and administrative expenses | [1] | $ 253,773 | $ 245,738
Unamortized Retirement Costs [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |  |
Amortization from Accumulated Other Comprehensive Loss [Abstract] |  |  |
Operating and administrative expenses |  | $ 1,400 | $ 1,400
[1] | Due to the retrospective adoption of ASU 2017-07, total net benefits of $1.9 million related to defined benefit and other post-employment benefit plans were reclassified from Operating and Administrative Expenses to Interest and Other Income for the three months ended July 31, 2017. Total net benefits were $2.4 million for the three months ended July 31, 2018. Refer to Note 2, "Recent Accounting Standards," in the Notes to Condensed Consolidated Financial Statements for more information.

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