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Fair Value Measurements (Carrying Value And Fair Value Of Debt) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, carrying value $ 2,007,148 $ 2,107,096
4.50% senior notes due September 2014 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, carrying value 0 399,952
Long-term debt, fair value 0 407,092
3.25% senior notes due October 2015 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, carrying value 249,925 249,887
Long-term debt, fair value 255,218 258,630
2.95% senior notes due June 2016 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, carrying value 249,883 249,848
Long-term debt, fair value 257,440 259,257
1.65% senior notes due February 2018 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, carrying value 324,634 324,579
Long-term debt, fair value 320,603 319,098
2.375% senior notes due February 2020 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, carrying value 274,770 274,748
Long-term debt, fair value 270,421 265,600
2.90% senior notes due November 2022 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, carrying value 249,773 249,760
Long-term debt, fair value 240,295 233,230
3.65% senior notes due July 2024 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, carrying value 299,432 0
Long-term debt, fair value $ 300,459 $ 0