Consolidated Statements Of Operations And Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Income Statement [Abstract]
Tax benefit on discontinued operations	$ (1,420)	$ 766	$ (3,309)	$ (3,798)