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Income Taxes (Schedule of Valuation Allowance) (Details) - USD ($)
$ in Thousands
12 Months Ended
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