Schedule of Undiscounted Amounts of Estimated Cash Flows (Details) (USD $)	3 Months Ended
	Oct. 31, 2014
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 1	$ 6,382,549
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 2	$ 6,382,549
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 3	2 years 6 months
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 4	12 years
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 5	2 years 6 months
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 6	12 years
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 7	1.56%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 8	2.43%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 9	1.56%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 10	2.43%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 11	5.00%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 12	10.50%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 13	5.00%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 14	10.50%