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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data | Apr. 30, 2011 | Apr. 30, 2010
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Consolidated Balance Sheets |  |
Allowance for doubtful accounts | $ 67,466 | $ 112,475
Allowance for loan losses | 92,087 | 93,535
Accumulated depreciation and amortization | $ 677,220 | $ 657,008
Common stock, stated value per share | $ 0.01 | $ 0.01
Common stock, shares authorized | 800,000,000 | 800,000,000
Common stock, shares issued | 412,440,559 | 431,390,599
Convertible preferred stock, stated value per share | $ 0.01 | $ 0.01
Convertible preferred stock, shares authorized | 500,000 | 500,000

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