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Indebtedness (Commercial Paper Narrative) (Details) (USD $)				1 Months Ended	12 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Credit Facility [Member]	Feb. 28, 2013 Senior Notes, Net [Member]	Mar. 31, 2013 Commercial Paper [Member]	Mar. 31, 2012 Commercial Paper [Member]	Mar. 31, 2013 Maximum [Member] Commercial Paper [Member]
Debt Instrument [Line Items]
Revolving line of credit, maximum borrowing capacity			$ 750,000,000		$ 750,000,000
Short-term Debt, Terms					maturities that may vary, but will generally not exceed 90 days from the date of issue
Short term debt maturity period							90 days
Debt issed during period, new issuance face value				600,000,000
Short-term debt	$ 0	$ 388,452,000			$ 0	$ 388,452,000
Debt Instrument, Interest Rate, Effective Percentage						0.54%

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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- Definition

Description of the short-term debt arrangement, and disclosures pertaining to the underlying arrangements, including repayment terms, interest rates, restrictions on assets and activities, debt covenants, and other matters important to users of the financial statements.

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