COMMON STOCK REPURCHASES (Details) (USD $)	6 Months Ended		1 Months Ended			6 Months Ended		1 Months Ended	6 Months Ended	1 Months Ended		1 Months Ended	6 Months Ended			1 Months Ended	6 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	May 31, 2011 Treasury Stock, Shares Acquired under ASR, Second Delivery [Member] May 2011 Accelerated Share Repurchase, Collared [Member]	Aug. 31, 2011 Treasury Stock, Shares Acquired under ASR, Second Delivery [Member] May 2011 Accelerated Share Repurchase, Uncollared [Member]	Aug. 31, 2011 Treasury Stock, Shares Acquired Under ASR, Third Delivery [Member] May 2011 Accelerated Share Repurchase, Collared [Member]	Sep. 30, 2011 Open Market Repurchases [Member]	Sep. 30, 2010 Open Market Repurchases [Member]	May 31, 2011 May 2011 Accelerated Share Repurchase, Total [Member]	Sep. 30, 2011 May 2011 Accelerated Share Repurchase, Total [Member]	Aug. 31, 2011 August 2011 Accelerated Share Repurchase [Member]	Aug. 19, 2011 August 2011 Accelerated Share Repurchase [Member]	May 31, 2011 May 2011 Accelerated Share Repurchase, Collared [Member]	Sep. 30, 2011 May 2011 Accelerated Share Repurchase, Collared [Member]	May 23, 2011 May 2011 Accelerated Share Repurchase, Collared [Member]	May 09, 2011 May 2011 Accelerated Share Repurchase, Collared [Member]	May 31, 2011 May 2011 Accelerated Share Repurchase, Uncollared [Member]	Sep. 30, 2011 May 2011 Accelerated Share Repurchase, Uncollared [Member]	May 09, 2011 May 2011 Accelerated Share Repurchase, Uncollared [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	2,163,034
Treasury Stock, Shares, Acquired			360,865	478,135	170,370	1,529,983	2,034,700		2,831,519	1,136,364		867,690	1,398,925			954,459	1,432,594
Treasury Stock, Value, Acquired, Cost Method						$ 49,100,000	$ 60,000,000						$ 50,000,000				$ 50,000,000
Treasury Stock Acquired, Average Cost Per Share						$ 32.07	$ 29.48						$ 35.74				$ 34.90
Employees Taxes Withheld And Paid For Restricted Stock And Restricted Stock Units	880,000	62,000
Accelerated Share Repurchase Initial Payment								100,000,000		50,000,000		50,000,000				50,000,000
Closing stock price											$ 30.80			$ 35.16	$ 37.56			$ 37.56
ASR, Value Allocated to Treasury Stock										35,000,000						35,800,000
ASR, Value Allocated to Equity Forward Contract										$ 15,000,000		$ 4,700,000				$ 14,200,000
Accelerated Share Repurchase Percentage Of Shares To Be Repurchased											70.00%