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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 | 6 Months Ended
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017
Remaining Performance Obligations [Abstract] |  |  |  |  |  |
Remaining performance obligations | $ 249,800 |  |  | $ 249,800 |  |
Assets Recognized for the Costs to Obtain or Fulfill a Contract [Abstract] |  |  |  |  |  |
Costs capitalized | 6,600 |  |  | 6,600 |  |
Amortization | 400 |  |  | 1,200 |  |
Cost of revenue [Abstract] |  |  |  |  |  |
Operating and administrative expenses | 248,627 | $ 241,301 | [1] | 502,400 | $ 487,039 | [1]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-08-01 |  |  |  |  |  |
Remaining Performance Obligations [Abstract] |  |  |  |  |  |
Remaining performance obligations | $ 237,200 |  |  | $ 237,200 |  |
Expected timing of satisfaction, period | 12 months |  |  | 12 months |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-08-01 |  |  |  |  |  |
Remaining Performance Obligations [Abstract] |  |  |  |  |  |
Remaining performance obligations | $ 12,600 |  |  | $ 12,600 |  |
Expected timing of satisfaction, period |  |  |  |  |  |
Shipping and Handling [Member] |  |  |  |  |  |
Cost of revenue [Abstract] |  |  |  |  |  |
Operating and administrative expenses | $ 8,600 | $ 8,800 |  | $ 16,500 | $ 16,600 |
[1] | Due to the retrospective adoption of Accounting Standards Update ("ASU") 2017-07, total net benefits of $2.0 million and $3.9 million related to the non-service components of defined benefit and other post-employment benefit plans were reclassified from Operating and Administrative Expenses to Interest and Other Income for the three and six months ended October 31, 2017, respectively. Total net benefits related to the non-service components of defined benefit and other post-employment benefit plans were $2.1 million and $4.5 million for the three and six months ended October 31, 2018, respectively. Refer to Note 2, "Recent Accounting Standards," in the Notes to Condensed Consolidated Financial Statements for more information.

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