Supplemental Cash Flow Information (Cash Paid For Interest And Taxes) (Details) (USD $)	9 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 55,263,000		$ 55,803,000
Income taxes (net of refunds)	120,093,000	[1]	77,320,000	[1]
Proceeds from Income Tax Refunds			$ 10,500,000

[1] During the nine months ended December 31, 2011, the Company applied for and received federal income tax refunds of $10.5 million. The Company did not receive federal income tax refunds during the nine months ended December 31, 2012.