Indebtedness (Schedule Of Long-Term Debt Maturities) (Details) (USD $)	37 Months Ended
	Mar. 31, 2013
Years Ending March 31, [Abstract]
2014	$ 301,107,000	[1]
2015	400,725,000	[1]
2016	545,373,000	[1]
2017	294,301,000	[1]
2018	325,046,000	[1]
Thereafter	740,446,000	[1]
Total maturities of long-term debt	2,606,998,000	[1]
Senior Notes, Net [Member]
Years Ending March 31, [Abstract]
Unamortized Discounts	1,700,000
2.85% Senior Notes Maturing October 2013 [Member] | Senior Notes, Net [Member]
Years Ending March 31, [Abstract]
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge	$ 2,500,000

[1] Outstanding borrowings under the Securitization Agreement at March 31, 2013 are reflected as maturing at the agreement’s expiration in December 2015.The Senior Notes are reflected in the debt maturity schedule at their maturity values rather than their carrying values, which are net of aggregate discounts of $1.7 million at March 31, 2013. The 2013 Notes also include additional carrying value of $2.5 million at March 31, 2013 related to the Company’s fair value hedges — see Note 10 for additional disclosure.