Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)	9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments and Hedging Activities [Line Items]
Amount of gain (loss) recognized in OCI, pre-tax	$ 388,000
Effective portion of derivative instrument loss to be reclassified from AOCI into Income		2,600,000
Effective portion of derivative instrument loss to be reclassified from AOCI into Income, net of tax		1,600,000
interest rate cash flow hedge gain or loss to be reclassified, gross	518,000
Net amount of existing losses recorded in 'Accumulated other comprehensive income (loss)', net of tax	326,000
Cash Flow Hedge Ineffectiveness is Immaterial	The net gain or loss recorded in earnings as a result of hedge ineffectiveness related to the designated fair value hedges was immaterial	The net gain or loss recorded in earnings as a result of hedge ineffectiveness related to the designated fair value hedges was immaterial
Interest Rate Swap Agreements [Member]
Derivative Instruments and Hedging Activities [Line Items]
Number of interest rate derivatives held	5
Notional amount of interest rate derivatives	300,000,000
Treasury Rate Lock Agreement [Member]
Derivative Instruments and Hedging Activities [Line Items]
Treasury rate lock was reclassified to interest expense	388,000
Cash Flow Hedging [Member] | Fixed Interest Rate Swaps [Member]
Derivative Instruments and Hedging Activities [Line Items]
Amount of gain (loss) recognized in OCI, pre-tax		4,000,000
Adjustment to 'Accumulated other comprehensive income (loss)', net of tax		2,700,000
Cash Flow Hedging [Member] | Treasury Rate Lock Agreement [Member]
Derivative Instruments and Hedging Activities [Line Items]
Notional amount of interest rate derivatives		100,000,000
Amount of gain (loss) recognized in OCI, pre-tax	388,000	1,504,000
Adjustment to 'Accumulated other comprehensive income (loss)', net of tax	244,000	1,108,000
Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities [Line Items]
Weighted average rate	1.49%
Fixed interest rate	2.85%
Fair Value Hedging [Member] | Interest Rate Swap Agreements [Member]
Derivative Instruments and Hedging Activities [Line Items]
Fixed interest payments converted to variable rate payments	300,000,000
Fair Value Hedging [Member] | Interest Rate Swap Agreements [Member] | Variable Interest Rate Swaps [Member]
Derivative Instruments and Hedging Activities [Line Items]
Number of interest rate derivatives outstanding	5
Notional amount of interest rate derivatives	300,000,000
Fair Value Hedging [Member] | Treasury Rate Lock Agreement [Member] | Variable Interest Rate Swaps [Member]
Derivative Instruments and Hedging Activities [Line Items]
Increase in fair value	2,000,000
Fair value of an asset recorded in "Other non-current assets"	7,000,000
Increase in carrying value of the 2013 Notes caused by hedged risk recorded in "Long-term debt"	$ 1,500,000
Maturity date	Oct. 01, 2013