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Income Taxes (Deferred Tax Assets and Liabilities by Balance Sheet Grouping) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mar. 31, 2012
Income Tax Expense (Benefit) [Abstract]    
Current deferred tax asset, net $ 53,562 $ 49,617
Non-current deferred tax liability, net (825,612) (793,957)
Net deferred tax liability $ (772,050) $ (744,340)