Accounting for Share-Based Compensation (Fair Value Assumptions Of Black-Scholes Option-Pricing Model) (Details) (Stock Appreciation Rights (SARs) [Member])	3 Months Ended
	Jun. 30, 2012 Y
Grant Date July 14, 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.20%
Expected option lives (in years)	1.0
Expected volatility for options	45.00%
Expected dividend yield	0.00%
Grant Date February 5, 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.30%
Expected option lives (in years)	1.6
Expected volatility for options	45.00%
Expected dividend yield	0.00%
Grant Date April 6, 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.30%
Expected option lives (in years)	1.8
Expected volatility for options	45.00%
Expected dividend yield	0.00%
Grant Date March 17, 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.40%
Expected option lives (in years)	2.7
Expected volatility for options	40.00%
Expected dividend yield	0.00%
Grant Date February 15, 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.60%
Expected option lives (in years)	3.6
Expected volatility for options	40.00%
Expected dividend yield	0.00%
Grant Date January 19, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.70%
Expected option lives (in years)	4.6
Expected volatility for options	38.00%
Expected dividend yield	0.00%
Grant Date February 9, 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.70%
Expected option lives (in years)	4.6
Expected volatility for options	38.00%
Expected dividend yield	0.00%