Earnings Per Share (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Jun. 30, 2012 New Capital Plan
Stock Repurchase Program, Authorized Amount			$ 1,000,000
Shares repurchased and retired, in dollars	$ 71,553	$ 316,624	$ 155,000
Maximum future operating cash flows authorized for share repurchases			65.00%
Common stock repurchased and retired, shares	2,783	12,510
Repurchased and Retired Shares, Reduction in Weighted Average Shares Outstanding	10,462	6,796