Stockholders' Equity (Tables)

12 Months Ended

Apr. 30, 2012

Stockholders' Equity [Abstract]

Summary Of Share Repurchase And Retirements

	(in 000s)
	Shares		Cost
Fiscal year:
2012		14,554	$	199,989
2011		18,950		279,947
2010		12,786		250,003