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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Jan. 31, 2012 | Apr. 30, 2011
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Condensed Consolidated Balance Sheets [Abstract] |  |
Allowance for doubtful accounts | $ 64,139 | $ 47,943
Allowance for loan losses | 89,949 | 92,087
Accumulated depreciation and amortization | $ 617,314 | $ 578,655
Common stock, stated value per share | $ 0.01 | $ 0.01
Common stock, shares authorized | 800,000,000 | 800,000,000
Common stock, shares issued | 399,397,099 | 412,440,599

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