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Quarterly Financial Data (Summary of Quarterly Financial Information) (Details) (USD $) In Thousands, except Per Share data | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2011 | Oct. 31, 2010 | Jul. 31, 2010 | Apr. 30, 2010 | Jan. 31, 2010 | Oct. 31, 2009 | Jul. 31, 2009 | Apr. 30, 2011 | Apr. 30, 2010 | Apr. 30, 2009
Quarterly Financial Data |  |  |  |  |  |  |  |  |  |
Revenues | $ 851,482 | $ 322,889 | $ 274,474 | $ 2,337,894 | $ 934,852 | $ 326,081 | $ 275,505 | $ 3,774,296 | $ 3,874,332 | $ 4,083,577
Income (loss) from continuing operations before taxes (benefit) |  | (175,119) | (207,317) | 1,110,410 | 97,451 | (212,853) | (210,873) | 677,025 | 784,135 | 839,370
Income taxes (benefit) |  | (68,307) | (79,679) | 417,978 | 43,848 | (86,381) | (80,256) | 257,620 | 295,189 | 326,315
Net income from continuing operations |  | (106,812) | (127,638) | 692,432 | 53,603 | (126,472) | (130,617) | 419,405 | 488,946 | 513,055
Net loss from discontinued operations |  | (2,237) | (3,043) | (1,604) | (2,968) | (2,115) | (3,017) | (13,295) | (9,704) | (27,382)
NET INCOME |  | $ (109,049) | $ (130,681) | $ 690,828 | $ 50,635 | $ (128,587) | $ (133,634) | $ 406,110 | $ 479,242 | $ 485,673
Net income from continuing operations |  | $ (0.35) | $ (0.40) | $ 2.11 | $ 0.16 | $ (0.38) | $ (0.39) | $ 1.35 | $ 1.47 | $ 1.53
Net loss from discontinued operations |  | $ (0.01) | $ (0.01) |  | $ (0.01) |  | $ (0.01) | $ (0.04) | $ (0.03) | $ (0.08)
Net income |  | $ (0.36) | $ (0.41) | $ 2.11 | $ 0.15 | $ (0.38) | $ (0.40) | $ 1.31 | $ 1.44 | $ 1.45
Net income (loss) from continuing operations |  | $ (0.35) | $ (0.40) | $ 2.11 | $ 0.16 | $ (0.38) | $ (0.39) | $ 1.35 | $ 1.46 | $ 1.53
Net loss from discontinued operations |  | $ (0.01) | $ (0.01) | $ (0.01) | $ (0.01) |  | $ (0.01) | $ (0.04) | $ (0.03) | $ (0.08)
Net income |  | $ (0.36) | $ (0.41) | $ 2.10 | $ 0.15 | $ (0.38) | $ (0.40) | $ 1.31 | $ 1.43 | $ 1.45

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