COMMON STOCK REPURCHASES (Details) (USD $)	6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	1,000,000
Employees' Taxes Withheld And Paid For Restricted Stock And Restricted Stock Units	$ 1,729,000	$ 880,000
Open Market Repurchases [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares, Acquired	633,613	1,529,983
Treasury Stock, Value, Acquired, Cost Method	19,900,000	49,100,000
Treasury Stock Acquired, Average Cost Per Share	$ 31.45	$ 32.07
Accelerated Share Repurchase [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares, Acquired		3,967,883
Treasury Stock, Value, Acquired, Cost Method		150,000,000
Accelerated Share Repurchase, Value Allocated to Treasury Stock		135,000,000
Accelerated Share Repurchase, Value Allocated To Equity Forward Contract		$ 15,000,000