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Recent Accounting Standards (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017 | Apr. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase in diluted shares outstanding (in shares) | 836 | 788 | 757 | 776 |
Excess tax benefits recorded in operating activities |  |  | $ 0 | $ (227) |
Excess tax benefits recorded in financing activities |  |  | 0 | 227 |
Accounting Standards Update 2015-17 [Member] | Prepaid and Other Current Assets [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Deferred tax assets, current |  |  |  |  | $ 800
Accounting Standards Update 2016-09 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Excess income tax benefits from stock-based compensation |  |  | 600 |  |
Excess tax benefits recorded in operating activities |  |  | $ 0 |  |
Excess tax benefits recorded in financing activities |  |  |  | 200 |
Accounting Standards Update 2016-09 [Member] | Maximum [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Increase in diluted shares outstanding (in shares) |  |  | 100 |  |
Accounting Standards Update 2017-07 Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net benefit costs expected to be reclassified from operating income to a line item below operating income | $ 2,100 | $ 800 | $ 5,900 | $ 2,500 |

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