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COMPREHENSIVE INCOME (Details) (USD $)
In Thousands
3 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]    
Net income $ 26,731 $ 25,946
Unrealized gain on cash flow hedges, net of tax 1,265 932
Foreign currency translation gain (loss), net of tax 652 (302)
Unrealized gain on investments, net of tax 53 0
Comprehensive income $ 28,701 $ 26,576