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Employee Stock Plans (Components Of Stock-Based Compensation Expense Recognized) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010
Total stock-based compensation expense, pre-tax	$ 3,427	$ 3,991	$ 6,597	$ 7,806
Tax benefit from stock-based compensation expense	(1,182)	(1,457)	(2,328)	(2,849)
Total stock-based compensation expense, net of tax	2,245	2,534	4,269	4,957
Restricted Stock [Member]
Total stock-based compensation expense, pre-tax	3,137	3,588	5,921	7,152
Stock Options And SARs [Member]
Total stock-based compensation expense, pre-tax	187	311	445	447
ESPP [Member]
Total stock-based compensation expense, pre-tax	$ 103	$ 92	$ 231	$ 207

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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