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Segment Information (Narrative) (Details) (USD $) In Thousands, 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total 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
Assets | 4,693,529 |  |  |  | 4,537,779 |  |  |  | 4,693,529 | 4,537,779 | 4,649,567
Foreign |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 232,200 | 249,000 | 232,800
Assets | $ 303,900 |  |  |  | $ 472,600 |  |  |  | $ 303,900 | $ 472,600 | $ 201,800

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