Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2014	Jul. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 9,238	$ 6,655
Other comprehensive income, net of tax:
Change in pension benefits, net of deferred tax of $(84) and $(110), respectively	132	172
Total Comprehensive Income	$ 9,370	$ 6,827