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Quarterly Financial Data (Summary Of Quarterly Financial Information) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 2,562,990 $ 199,770 $ 134,340 $ 127,195 $ 2,200,212 $ 471,979 $ 137,263 $ 96,489 $ 3,024,295 $ 2,905,943 $ 2,893,771
Income (loss) from continuing operations before taxes (benefit) 1,478,797 (347,825) (179,362) (184,494) 1,129,836 (96,268) (162,288) (169,269) 767,116 702,011 576,070
Income taxes (benefit) 549,664 (135,074) (76,347) (71,224) 440,914 (79,353) (61,089) (63,619) 267,019 236,853 230,102
Net income (loss) from continuing operations 929,133 (212,751) (103,015) (113,270) 688,922 (16,915) (101,199) (105,650) 500,097 465,158 345,968
Net loss from discontinued operations, net of tax benefits of $15,422, $19,662 and $74,944 (19,135) (1,960) (1,928) (1,917) (24,582) (793) (4,044) (1,791) (24,940) (31,210) (80,036)
NET INCOME 909,998 (214,711) (104,943) (115,187) 664,340 (17,708) (105,243) (107,441) 475,157 433,948 265,932
Continuing operations (in usd per share $ 3.38 $ (0.78) $ (0.38) $ (0.42) $ 2.53 $ (0.06) $ (0.37) $ (0.38) $ 1.82 $ 1.70 $ 1.16
Discontinued operations (in usd per share) $ (0.07) $ 0.00 $ (0.01) $ 0.00 $ (0.09) $ (0.01) $ (0.02) $ (0.01) $ (0.09) $ (0.11) $ (0.27)
Consolidated (in usd per share) $ 3.31 $ (0.78) $ (0.39) $ (0.42) $ 2.44 $ (0.07) $ (0.39) $ (0.39) $ 1.73 $ 1.59 $ 0.89
Continuing operations (in usd per share) $ 3.36 $ (0.78) $ (0.38) $ (0.42) $ 2.51 $ (0.06) $ (0.37) $ (0.38) $ 1.81 $ 1.69 $ 1.16
Discontinued operations (in usd per share) $ (0.07) $ 0.00 $ (0.01) $ 0.00 $ (0.09) $ (0.01) $ (0.02) $ (0.01) $ (0.09) $ (0.11) $ (0.27)
Consolidated (in usd per share) $ 3.29 $ (0.78) $ (0.39) $ (0.42) $ 2.42 $ (0.07) $ (0.39) $ (0.39) $ 1.72 $ 1.58 $ 0.89
Goodwill impairments                 $ 0 $ 0 $ 7,409