Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Apr. 30, 2011	Apr. 30, 2010
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