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Supplemental Cash Flow Information (Cash Paid For Interest And Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Supplemental Cash Flow Information [Abstract]    
Interest $ 32,667 $ 42,107
Income taxes, net of refunds $ 108,847 $ 74,910