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COMPREHENSIVE INCOME (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Statement of Income and Comprehensive Income [Abstract]        
Net income $ 30,898 $ 31,552 $ 85,150 $ 82,927
Unrealized gain (loss) on cash flow hedges, net of tax 2,078 1,124 6,112 (2,890)
Foreign currency translation gain (loss), net of tax (535) (227) (942) 495
Unrealized gain (loss) on investments, net of tax 56 (10) (112) 32
Comprehensive income $ 32,497 $ 32,439 $ 90,208 $ 80,564