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INCOME TAXES (Details 3) (USD $)
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
INCOME TAXES      
Income taxes based on domestic statutory rates $ 55,899,000 $ 95,858,000 $ 106,725,000
Effect of tax rate differential (120,785,000) (177,540,000) 26,459,000
Intangible amortization 4,881,000 9,502,000 12,055,000
Change in liability for uncertain tax positions 15,268,000 34,517,000 (29,205,000)
Change in valuation allowance 68,596,000 93,336,000 (90,033,000)
Other 2,454,000 (1,713,000) (3,952,000)
Provision for income taxes 26,313,000 53,960,000 22,049,000
Income resulting from tax holidays and tax incentives 22,600,000 41,800,000 66,500,000
Expiration date of existing holidays 2022    
Tax effect of foreign income not repatriated to Singapore $ 26,700,000 $ 17,700,000 $ 32,600,000
Effect on basic loss per share due to income resulting from tax holidays and tax incentives (in dollars per share) $ 0.03 $ 0.06 $ 0.09
Effect on diluted loss per share due to income resulting from tax holidays and tax incentives (in dollars per share) $ 0.03 $ 0.06 $ 0.08