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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Apr. 30, 2014 | Apr. 30, 2013
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Statement of Financial Position [Abstract] |  |
Allowance for doubtful accounts | $ 52,578 | $ 50,399
Allowance for loan losses | 11,272 | 14,314
Accumulated depreciation and amortization | $ 446,049 | $ 420,318
Common stock, no par value | $ 0 | $ 0
Common stock, stated value per share | $ 0.01 | $ 0.01
Common stock, shares authorized | 800,000,000 | 800,000,000
Common stock, shares issued | 316,628,110 | 316,628,110
Convertible preferred stock, stated value per share | $ 0.01 | $ 0.01
Convertible preferred stock, shares authorized | 500,000 | 500,000

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