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Income Taxes (Schedule of Valuation Allowance) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Income Tax Disclosure [Abstract] |  |  |
Document Fiscal Year Focus | 2018 |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance, beginning of the year | $ 22,844 | $ 21,515 | $ 24,937
Charged to costs and expenses | 26,371 | 3,281 | 3,207
Charged to other accounts | 0 | 0 | 0
Deductions | 0 | 1,952 | 6,629
Balance, end of the year | $ 49,215 | $ 22,844 | $ 21,515

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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