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Income taxes (Details 2) (USD $)	3 Months Ended
Income taxes (Details 2) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Federal income tax
Current
Deferred	(29,861,900)	(203,324,600)
State income tax, net of federal benefit
Current
Deferred	(5,533,200)	(37,674,900)
Change in valuation allowance	35,395,200	240,999,400
Benefit for income taxes

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.