Stock-Based Compensation (Stock-Based Awards Issued During The Period) (Details) (USD $)	9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number granted	170,400	153,600
Exercise price	$ 37.86	$ 39.71
Grant date fair value	$ 7.46	$ 8.35
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number granted	71,900	53,700
Grant date fair value	$ 37.29	$ 41.14
Performance Share Awards (PSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number granted	42,600	38,400
Grant date fair value	$ 31.95	$ 33.95