Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Oct. 31, 2012	Apr. 30, 2012
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 42,761	$ 44,589
Allowance for loan losses	18,125	26,540
Accumulated depreciation and amortization	$ 562,178	$ 622,313
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	397,886,599