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Borrowings (Schedule Of Borrowings) (Details) (USD $) In Thousands, unless otherwise specified |  |  |  | 9 Months Ended |  |  | 9 Months Ended |  | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2013 | Apr. 30, 2012 | Jan. 31, 2012 | Jan. 31, 2013 Senior Notes, 5.125%, Due October 2014 [Member] | Apr. 30, 2012 Senior Notes, 5.125%, Due October 2014 [Member] | Jan. 31, 2012 Senior Notes, 5.125%, Due October 2014 [Member] | Jan. 31, 2013 Senior Notes, 5.500%, Due November 2022 [Member] | Oct. 25, 2012 Senior Notes, 5.500%, Due November 2022 [Member] | Jan. 31, 2013 Senior Notes, 7.875% Due January 2013 [Member] | Apr. 30, 2012 Senior Notes, 7.875% Due January 2013 [Member] | Jan. 31, 2012 Senior Notes, 7.875% Due January 2013 [Member] | Jan. 31, 2013 Other [Member] | Apr. 30, 2012 Other [Member] | Jan. 31, 2012 Other [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial paper outstanding | $ 424,967 |  | $ 230,947 |  |  |  |  |  |  |  |  |  |  |
Debt, Long-term and Short-term, Combined Amount, Total | 906,725 | 1,040,549 | 1,040,237 | 399,588 | 399,412 | 399,364 | 497,260 |  |  | 599,913 | 599,871 | 9,877 | 41,224 | 41,002
Less: Current portion | (713) | (631,434) | (630,996) |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 906,012 | $ 409,115 | $ 409,241 |  |  |  |  | $ 500,000 |  |  |  |  |  |
Long-term note, interest rate |  |  |  | 5.125% |  |  | 5.50% |  | 7.875% |  |  |  |  |
Senior notes, maturity date |  |  |  | Oct. 01, 2014 |  |  | Nov. 01, 2022 |  | Jan. 01, 2013 |  |  |  |  |

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