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Trade Receivables Securitization (Tables)
9 Months Ended
Dec. 31, 2011
Trade Receivables Securitization [Abstract]  
Summary Of Deferred Purchase Price Receivables
    Nine-Month Period Ended     Nine-Month Period Ended  
    December 31, 2011     December 31, 2010  
    (In thousands)     (In thousands)  
Beginning balance $ 459,994   $ 135,401  
Transfers of receivables   4,072,482     2,395,398  
Collections   (3,782,161 )   (1,709,560 )
Ending balance $ 750,315   $ 821,239