Stock-Based Compensation (Stock-Based Awards Issued During The Period) (Details) (USD $)	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number granted		170,400
Exercise price		$ 37.86
Grant date fair value		$ 7.46
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number granted	75,950	71,900
Grant date fair value	44.39	$ 37.29
Performance Share Awards (PSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number granted	60,850	42,600
Grant date fair value	38.14	$ 31.95