Earnings Per Share Shares Purchased and Retired (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2012 Newly Authorized [Member]
Shares Repurchases [Line Items]
Stock Repurchased and Retired During Period, Shares	9,677	16,199	13,597
Stock Repurchased and Retired During Period, Value	$ 359,996	$ 425,475	$ 400,266	$ 270,000
Repurchased and Retired Shares, Excluded from Weighted Average Shares Outstanding Number	4,908	8,449	9,716
Common Stock Issued During Period Shares Equity Units Tender Offer			1,830
Weighted Average Shares Outstanding, Common Stock Issued Through Equity Units			1,380