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INCOME TAXES (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Distribution of income (loss) before provision for income taxes      
Income (loss) before the provision for income taxes $ 35,441 $ (114,392) $ (46,491)
Ireland
     
Distribution of income (loss) before provision for income taxes      
Income (loss) before the provision for income taxes (14,722) (36,711)  
U.S
     
Distribution of income (loss) before provision for income taxes      
Income (loss) before the provision for income taxes 23,503 (84,858) (46,491)
Rest of world
     
Distribution of income (loss) before provision for income taxes      
Income (loss) before the provision for income taxes $ 26,660 $ 7,177