Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 15,158	$ 9,238
Other comprehensive income, net of tax:
Change in pension benefits, net of deferred tax of $(138) and $(84), respectively	216	132
Total Comprehensive Income	$ 15,374	$ 9,370