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Accumulated Other Comprehensive Loss, Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2017 | Oct. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Operating and administrative expenses | $ 239,318 | $ 247,270 | $ 483,126 | $ 482,497
Unamortized Retirement Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Operating and administrative expenses | $ 1,500 | $ 10,000 | $ 2,900 | $ 8,700

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