Supplemental Cash Flow Information (Cash Paid For Interest And Taxes) (Details) (USD $)	9 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 55,803,000		$ 46,348,000
Income taxes (net of refunds)	77,320,000	[1]	48,907,000	[1]
Proceeds from income tax refunds	$ 10,500,000		$ 26,000,000

[1] During the nine months ended December 31, 2011 and 2010, the Company applied for and received federal income tax refunds of $10.5 million and $26.0 million, respectively.