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Revenue Recognition, Contracts with Customers, Remaining Performance Obligations, Assets Recognized for the Costs to Obtain or Fulfill a Contract (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2018 | Jul. 31, 2017
Remaining Performance Obligations [Abstract] |  |  |
Remaining performance obligation |  | $ 407,200 |
Assets Recognized for the Costs to Obtain or Fulfill a Contract [Abstract] |  |  |
Costs capitalized |  | 5,700 |
Amortization |  | 800 |
Cost of revenue [Abstract] |  |  |
Operating and administrative expenses | [1] | 253,773 | $ 245,738
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-08-01 |  |  |
Remaining Performance Obligations [Abstract] |  |  |
Remaining performance obligation |  | $ 392,300 |
Expected timing of satisfaction, period |  | 12 months |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-08-01 |  |  |
Remaining Performance Obligations [Abstract] |  |  |
Remaining performance obligation |  | $ 14,900 |
Expected timing of satisfaction, period |  |  |
Shipping and Handling [Member] |  |  |
Cost of revenue [Abstract] |  |  |
Operating and administrative expenses |  | $ 7,900 | $ 7,800
[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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