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Consolidated Statements Of Operations And Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Income Statement [Abstract]
Tax benefit on discontinued operations	$ 2	$ 8	$ 8	$ 2,267
Discontinued Operation, Tax Effect of Discontinued Operation	1,919	1,776	5,120	5,085
Marketable Securities, Realized Gain (Loss)	$ 0	$ 0	$ 0	$ 3,213

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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