Consolidated Statements Of Operations And Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013
Income Statement [Abstract]
Tax benefit on discontinued operations	$ 766	$ (1,218)	$ (3,798)	$ (2,427)