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Stock-Based Compensation (Summary Of Stock-Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Stock-based compensation expense related to:
Stock option plans	$ 3,311	$ 3,078	$ 18,450	$ 15,998
Employee stock purchase plan, compensation expense	971	1,188	2,902	3,537
Employee Stock Purchase Plan - options to purchase stock	4,282	4,266	21,352	19,535
Tax benefit	(1,410)	(1,449)	(7,370)	(6,746)
Stock-based compensation expense, net of tax	$ 2,872	$ 2,817	$ 13,982	$ 12,789

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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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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