Schedule of Undiscounted Amounts of Estimated Cash Flows (Details)	3 Months Ended
	Oct. 31, 2015 USD ($)
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 1	$ 6,600,868
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 2	$ 6,600,868
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 3	2.5
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 4	15
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 5	2.5
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 6	15
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 7	2.02%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 8	2.25%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 9	2.02%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 10	2.25%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 11	6.56%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 12	8.00%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 13	6.56%
Asset Retirement Obligations Schedule Of Undiscounted Amounts Of Estimated Cash Flows 14	8.00%