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Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).","units":{"USD":[{"end":"2011-04-30","val":72000,"accn":"0001062993-12-002593","fy":2012,"fp":"FY","form":"10-K","filed":"2012-07-30","frame":"CY2011Q1I"},{"end":"2011-04-30","val":72000,"accn":"0001062993-12-000866","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-03-14"},{"end":"2011-04-30","val":72000,"accn":"0001062993-11-004924","fy":2012,"fp":"Q2","form":"10-Q","filed":"2011-12-15"},{"end":"2011-04-30","val":72000,"accn":"0001062993-11-003737","fy":2012,"fp":"Q1","form":"10-Q","filed":"2011-09-14"},{"end":"2011-07-31","val":65000,"accn":"0001062993-11-003737","fy":2012,"fp":"Q1","form":"10-Q","filed":"2011-09-14","frame":"CY2011Q2I"},{"end":"2011-10-31","val":10000,"accn":"0001062993-11-004924","fy":2012,"fp":"Q2","form":"10-Q","filed":"2011-12-15","frame":"CY2011Q3I"},{"end":"2012-01-31","val":10000,"accn":"0001062993-12-000866","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-03-14","frame":"CY2011Q4I"},{"end":"2012-04-30","val":5000,"accn":"0001062993-13-003717","fy":2013,"fp":"FY","form":"10-K","filed":"2013-07-31","frame":"CY2012Q1I"},{"end":"2012-04-30","val":5000,"accn":"0001062993-13-001253","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-03-18"},{"end":"2012-04-30","val":5000,"accn":"0001062993-12-005460","fy":2013,"fp":"Q2","form":"10-Q","filed":"2012-12-17"},{"end":"2012-04-30","val":5000,"accn":"0001062993-12-003595","fy":2013,"fp":"Q1","form":"10-Q","filed":"2012-09-14"},{"end":"2012-04-30","val":5000,"accn":"0001062993-12-002593","fy":2012,"fp":"FY","form":"10-K","filed":"2012-07-30"},{"end":"2012-07-31","val":0,"accn":"0001062993-12-003595","fy":2013,"fp":"Q1","form":"10-Q","filed":"2012-09-14","frame":"CY2012Q2I"},{"end":"2012-10-31","val":0,"accn":"0001062993-12-005460","fy":2013,"fp":"Q2","form":"10-Q","filed":"2012-12-17","frame":"CY2012Q3I"},{"end":"2013-01-31","val":0,"accn":"0001062993-13-001253","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-04-30","val":0,"accn":"0001062993-13-003717","fy":2013,"fp":"FY","form":"10-K","filed":"2013-07-31","frame":"CY2013Q1I"}]}},"AccumulatedOtherComprehensiveIncomeLossNetOfTax":{"label":"Accumulated Other Comprehensive Income (Loss), Net of Tax","description":"Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.","units":{"USD":[{"end":"2013-04-30","val":0,"accn":"0001062993-13-006463","fy":2014,"fp":"Q2","form":"10-Q/A","filed":"2013-12-24"},{"end":"2013-04-30","val":0,"accn":"0001062993-14-001378","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-03-17"},{"end":"2013-04-30","val":0,"accn":"0001062993-14-004921","fy":2014,"fp":"FY","form":"10-K","filed":"2014-08-14","frame":"CY2013Q1I"},{"end":"2013-10-31","val":-700000,"accn":"0001062993-13-006463","fy":2014,"fp":"Q2","form":"10-Q/A","filed":"2013-12-24","frame":"CY2013Q3I"},{"end":"2014-01-31","val":-620000,"accn":"0001062993-14-001378","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-03-17","frame":"CY2013Q4I"},{"end":"2014-04-30","val":-500000,"accn":"0001062993-14-004921","fy":2014,"fp":"FY","form":"10-K","filed":"2014-08-14"},{"end":"2014-04-30","val":-500000,"accn":"0001062993-14-005587","fy":2015,"fp":"Q1","form":"10-Q","filed":"2014-09-22"},{"end":"2014-04-30","val":-500000,"accn":"0001062993-14-007148","fy":2015,"fp":"Q2","form":"10-Q","filed":"2014-12-16"},{"end":"2014-04-30","val":-500000,"accn":"0001062993-15-001370","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-03-17"},{"end":"2014-04-30","val":-500000,"accn":"0001062993-15-004084","fy":2015,"fp":"FY","form":"10-K","filed":"2015-07-30","frame":"CY2014Q1I"},{"end":"2014-07-31","val":-80000,"accn":"0001062993-14-005587","fy":2015,"fp":"Q1","form":"10-Q","filed":"2014-09-22","frame":"CY2014Q2I"},{"end":"2014-10-31","val":-620000,"accn":"0001062993-14-007148","fy":2015,"fp":"Q2","form":"10-Q","filed":"2014-12-16","frame":"CY2014Q3I"},{"end":"2015-01-31","val":-480000,"accn":"0001062993-15-001370","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-03-17","frame":"CY2014Q4I"},{"end":"2015-04-30","val":0,"accn":"0001062993-15-004084","fy":2015,"fp":"FY","form":"10-K","filed":"2015-07-30","frame":"CY2015Q1I"},{"end":"2016-04-30","val":0,"accn":"0001062993-16-011450","fy":2017,"fp":"Q1","form":"10-Q","filed":"2016-09-14","frame":"CY2016Q1I"},{"end":"2016-07-31","val":4248,"accn":"0001062993-16-011450","fy":2017,"fp":"Q1","form":"10-Q","filed":"2016-09-14","frame":"CY2016Q2I"}]}},"AdditionalPaidInCapital":{"label":"Additional Paid in Capital","description":"Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.","units":{"USD":[{"end":"2011-04-30","val":11743452,"accn":"0001062993-11-003737","fy":2012,"fp":"Q1","form":"10-Q","filed":"2011-09-14"},{"end":"2011-04-30","val":11743452,"accn":"0001062993-11-004924","fy":2012,"fp":"Q2","form":"10-Q","filed":"2011-12-15"},{"end":"2011-04-30","val":11743452,"accn":"0001062993-12-000866","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-03-14"},{"end":"2011-04-30","val":11743452,"accn":"0001062993-12-002593","fy":2012,"fp":"FY","form":"10-K","filed":"2012-07-30","frame":"CY2011Q1I"},{"end":"2011-07-31","val":12871432,"accn":"0001062993-11-003737","fy":2012,"fp":"Q1","form":"10-Q","filed":"2011-09-14","frame":"CY2011Q2I"},{"end":"2011-10-31","val":12978185,"accn":"0001062993-11-004924","fy":2012,"fp":"Q2","form":"10-Q","filed":"2011-12-15","frame":"CY2011Q3I"},{"end":"2012-01-31","val":13588992,"accn":"0001062993-12-000866","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-03-14","frame":"CY2011Q4I"},{"end":"2012-04-30","val":13600488,"accn":"0001062993-12-002593","fy":2012,"fp":"FY","form":"10-K","filed":"2012-07-30"},{"end":"2012-04-30","val":13600488,"accn":"0001062993-12-003595","fy":2013,"fp":"Q1","form":"10-Q","filed":"2012-09-14"},{"end":"2012-04-30","val":13600488,"accn":"0001062993-12-005460","fy":2013,"fp":"Q2","form":"10-Q","filed":"2012-12-17"},{"end":"2012-04-30","val":13600488,"accn":"0001062993-13-001253","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-03-18"},{"end":"2012-04-30","val":13600488,"accn":"0001062993-13-003717","fy":2013,"fp":"FY","form":"10-K","filed":"2013-07-31","frame":"CY2012Q1I"},{"end":"2012-07-31","val":13600488,"accn":"0001062993-12-003595","fy":2013,"fp":"Q1","form":"10-Q","filed":"2012-09-14","frame":"CY2012Q2I"},{"end":"2012-10-31","val":13600488,"accn":"0001062993-12-005460","fy":2013,"fp":"Q2","form":"10-Q","filed":"2012-12-17","frame":"CY2012Q3I"},{"end":"2013-01-31","val":13603775,"accn":"0001062993-13-001253","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-04-30","val":13603775,"accn":"0001062993-13-003717","fy":2013,"fp":"FY","form":"10-K","filed":"2013-07-31"},{"end":"2013-04-30","val":13603775,"accn":"0001062993-13-004690","fy":2014,"fp":"Q1","form":"10-Q","filed":"2013-09-18"},{"end":"2013-04-30","val":13603775,"accn":"0001062993-13-006463","fy":2014,"fp":"Q2","form":"10-Q/A","filed":"2013-12-24"},{"end":"2013-04-30","val":13603775,"accn":"0001062993-14-001378","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-03-17"},{"end":"2013-04-30","val":13603775,"accn":"0001062993-14-004921","fy":2014,"fp":"FY","form":"10-K","filed":"2014-08-14","frame":"CY2013Q1I"},{"end":"2013-07-31","val":13603775,"accn":"0001062993-13-004690","fy":2014,"fp":"Q1","form":"10-Q","filed":"2013-09-18","frame":"CY2013Q2I"},{"end":"2013-10-31","val":14146262,"accn":"0001062993-13-006463","fy":2014,"fp":"Q2","form":"10-Q/A","filed":"2013-12-24","frame":"CY2013Q3I"},{"end":"2014-01-31","val":15480042,"accn":"0001062993-14-001378","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-03-17","frame":"CY2013Q4I"},{"end":"2014-04-30","val":15673181,"accn":"0001062993-14-004921","fy":2014,"fp":"FY","form":"10-K","filed":"2014-08-14"},{"end":"2014-04-30","val":15673181,"accn":"0001062993-14-005587","fy":2015,"fp":"Q1","form":"10-Q","filed":"2014-09-22"},{"end":"2014-04-30","val":15673181,"accn":"0001062993-14-007148","fy":2015,"fp":"Q2","form":"10-Q","filed":"2014-12-16"},{"end":"2014-04-30","val":15673181,"accn":"0001062993-15-001370","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-03-17"},{"end":"2014-04-30","val":15673181,"accn":"0001062993-15-004084","fy":2015,"fp":"FY","form":"10-K","filed":"2015-07-30","frame":"CY2014Q1I"},{"end":"2014-07-31","val":15783181,"accn":"0001062993-14-005587","fy":2015,"fp":"Q1","form":"10-Q","filed":"2014-09-22","frame":"CY2014Q2I"},{"end":"2014-10-31","val":16035410,"accn":"0001062993-14-007148","fy":2015,"fp":"Q2","form":"10-Q","filed":"2014-12-16","frame":"CY2014Q3I"},{"end":"2015-01-31","val":16035410,"accn":"0001062993-15-001370","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-03-17","frame":"CY2014Q4I"},{"end":"2015-04-30","val":16400725,"accn":"0001062993-15-004084","fy":2015,"fp":"FY","form":"10-K","filed":"2015-07-30"},{"end":"2015-04-30","val":16400725,"accn":"0001062993-15-005103","fy":2016,"fp":"Q1","form":"10-Q","filed":"2015-09-18"},{"end":"2015-04-30","val":16400725,"accn":"0001062993-15-006684","fy":2016,"fp":"Q2","form":"10-Q","filed":"2015-12-15"},{"end":"2015-04-30","val":16400725,"accn":"0001062993-16-008335","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-03-14"},{"end":"2015-04-30","val":16400725,"accn":"0001062993-16-010735","fy":2016,"fp":"FY","form":"10-K","filed":"2016-07-28"},{"end":"2015-04-30","val":16400725,"accn":"0001062993-16-011571","fy":2016,"fp":"FY","form":"10-K","filed":"2016-09-27","frame":"CY2015Q1I"},{"end":"2015-07-31","val":16400725,"accn":"0001062993-15-005103","fy":2016,"fp":"Q1","form":"10-Q","filed":"2015-09-18","frame":"CY2015Q2I"},{"end":"2015-1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of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or 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Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.","units":{"USD/shares":[{"start":"2014-05-01","end":"2014-10-31","val":0,"accn":"0001062993-15-006684","fy":2016,"fp":"Q2","form":"10-Q","filed":"2015-12-15"},{"start":"2014-08-01","end":"2014-10-31","val":0,"accn":"0001062993-15-006684","fy":2016,"fp":"Q2","form":"10-Q","filed":"2015-12-15","frame":"CY2014Q3"},{"start":"2014-05-01","end":"2015-01-31","val":0,"accn":"0001062993-16-008335","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-03-14"},{"start":"2014-11-01","end":"2015-01-31","val":0,"accn":"0001062993-16-008335","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-03-14","frame":"CY2014Q4"},{"start":"2014-05-01","end":"2015-04-30","val":-0.01,"accn":"0001062993-16-010735","fy":2016,"fp":"FY","form":"10-K","filed":"2016-07-28"},{"start":"2014-05-01","end":"2015-04-30","val":-0.01,"accn":"0001062993-16-011571","fy":2016,"fp":"FY","form":"10-K","filed":"2016-09-27","frame":"CY2014"},{"start":"2015-05-01","end":"2015-07-31","val":0,"accn":"0001062993-16-011450","fy":2017,"fp":"Q1","form":"10-Q","filed":"2016-09-14","frame":"CY2015Q2"},{"start":"2015-05-01","end":"2015-10-31","val":0,"accn":"0001062993-15-006684","fy":2016,"fp":"Q2","form":"10-Q","filed":"2015-12-15"},{"start":"2015-05-01","end":"2015-10-31","val":0,"accn":"0001062993-16-012782","fy":2017,"fp":"Q2","form":"10-Q","filed":"2016-12-21"},{"start":"2015-08-01","end":"2015-10-31","val":0,"accn":"0001062993-15-006684","fy":2016,"fp":"Q2","form":"10-Q","filed":"2015-12-15"},{"start":"2015-08-01","end":"2015-10-31","val":0,"accn":"0001062993-16-012782","fy":2017,"fp":"Q2","form":"10-Q","filed":"2016-12-21","frame":"CY2015Q3"},{"start":"2015-05-01","end":"2016-01-31","val":0,"accn":"0001062993-16-008335","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-03-14"},{"start":"2015-05-01","end":"2016-01-31","val":0,"accn":"0001062993-17-001379","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-03-15"},{"start":"2015-11-01","end":"2016-01-31","val":0,"accn":"0001062993-16-008335","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-03-14"},{"start":"2015-11-01","end":"2016-01-31","val":0,"accn":"0001062993-17-001379","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-03-15","frame":"CY2015Q4"},{"start":"2015-05-01","end":"2016-04-30","val":0,"accn":"0001062993-16-010735","fy":2016,"fp":"FY","form":"10-K","filed":"2016-07-28"},{"start":"2015-05-01","end":"2016-04-30","val":0,"accn":"0001062993-16-011571","fy":2016,"fp":"FY","form":"10-K","filed":"2016-09-27"},{"start":"2015-05-01","end":"2016-04-30","val":0,"accn":"0001062993-17-003413","fy":2017,"fp":"FY","form":"10-K","filed":"2017-07-27","frame":"CY2015"},{"start":"2016-05-01","end":"2016-07-31","val":0,"accn":"0001062993-16-011450","fy":2017,"fp":"Q1","form":"10-Q","filed":"2016-09-14"},{"start":"2016-05-01","end":"2016-07-31","val":0,"accn":"0001062993-17-004127","fy":2018,"fp":"Q1","form":"10-Q","filed":"2017-09-14","frame":"CY2016Q2"},{"start":"2016-05-01","end":"2016-10-31","val":0,"accn":"0001062993-16-012782","fy":2017,"fp":"Q2","form":"10-Q","filed":"2016-12-21"},{"start":"2016-08-01","end":"2016-10-31","val":0,"accn":"0001062993-16-012782","fy":2017,"fp":"Q2","form":"10-Q","filed":"2016-12-21","frame":"CY2016Q3"},{"start":"2016-05-01","end":"2017-01-31","val":0,"accn":"0001062993-17-001379","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-03-15"},{"start":"2016-11-01","end":"2017-01-31","val":0,"accn":"0001062993-17-001379","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-03-15","frame":"CY2016Q4"},{"start":"2016-05-01","end":"2017-04-30","val":0,"accn":"0001062993-17-003413","fy":2017,"fp":"FY","form":"10-K","filed":"2017-07-27","frame":"CY2016"},{"start":"2017-05-01","end":"2017-07-31","val":0,"accn":"0001062993-17-004127","fy":2018,"fp":"Q1","form":"10-Q","filed":"2017-09-14","frame":"CY2017Q2"}]}},"ExplorationExpense":{"label":"Exploration Expense","description":"\"Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or \"\"G&G\"\" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. 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