COMMON STOCK REPURCHASES (Details) (USD $)	12 Months Ended										1 Months Ended	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2012 Share Repurchases, Total [Member]	Mar. 31, 2011 Share Repurchases, Total [Member]	Mar. 31, 2010 Share Repurchases, Total [Member]	Mar. 31, 2012 Accelerated Share Repurchases, Total [Member]	Mar. 31, 2012 Open Market Repurchases [Member]	Mar. 31, 2011 Open Market Repurchases [Member]	Mar. 31, 2010 Open Market Repurchases [Member]	May 31, 2011 May 2011 Accelerated Share Repurchase, Total [Member]	Mar. 31, 2012 May 2011 Accelerated Share Repurchase, Total [Member]	Mar. 31, 2012 May 2011 Accelerated Share Repurchase, Collared [Member]	Mar. 31, 2012 May 2011 Accelerated Share Repurchase, Uncollared [Member]	Mar. 31, 2012 August 2011 Accelerated Share Repurchase [Member]	Mar. 31, 2012 Treasury Stock [Member]	Mar. 31, 2011 Treasury Stock [Member]	Mar. 31, 2010 Treasury Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Payments for Repurchase of Common Stock	$ 273,791,000	$ 105,522,000	$ 49,652,000	$ 273,800,000	$ 105,500,000	$ 49,700,000		$ 123,800,000	$ 105,500,000	$ 49,700,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	633,613
Treasury Stock, Shares, Acquired				8,027,287	3,315,000	1,935,100	4,327,770	3,699,517				2,831,519	1,398,925	1,432,594	1,496,251
Treasury Stock, Value, Acquired, Cost Method	273,791,000	105,522,000	49,652,000											50,000,000	50,000,000	273,791,000	105,522,000	49,652,000
Treasury Stock Acquired, Average Cost Per Share								$ 33.46	$ 31.83	$ 25.66			$ 35.74	$ 34.90	$ 33.42
Employees Taxes Withheld And Paid For Restricted Stock And Restricted Stock Units	2,596,000	194,000	0
Accelerated Share Repurchase Initial Payment											$ 100,000,000
Treasury Stock, Shares, Retired	5,000,000	4,000,000	2,000,000