Consolidated Statements Of Operations And Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
Income Statement [Abstract]
Tax benefit on discontinued operations	$ (1,776)	$ (1,016)	$ (5,085)	$ (4,814)