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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"Boe":[{"start":"2012-10-01","end":"2013-09-30","val":-577000,"accn":"0001104659-14-087562","fy":2014,"fp":"FY","form":"10-K","filed":"2014-12-18","frame":"CY2013"},{"start":"2013-10-01","end":"2014-09-30","val":-516000,"accn":"0001104659-14-087562","fy":2014,"fp":"FY","form":"10-K","filed":"2014-12-18"},{"start":"2013-10-01","end":"2014-09-30","val":516000,"accn":"0000010048-15-000008","fy":2015,"fp":"FY","form":"10-K","filed":"2015-12-16","frame":"CY2014"},{"start":"2014-10-01","end":"2015-09-30","val":434000,"accn":"0000010048-15-000008","fy":2015,"fp":"FY","form":"10-K","filed":"2015-12-16"},{"start":"2014-10-01","end":"2015-09-30","val":434000,"accn":"0000010048-16-000021","fy":2016,"fp":"FY","form":"10-K","filed":"2016-12-20","frame":"CY2015"},{"start":"2015-10-01","end":"2016-09-30","val":166000,"accn":"0000010048-16-000021","fy":2016,"fp":"FY","form":"10-K","filed":"2016-12-20"},{"start":"2015-10-01","end":"2016-09-30","val":166000,"accn":"0000010048-17-000011","fy":2017,"fp":"FY","form":"10-K","filed":"2017-12-21","frame":"CY2016"},{"start":"2016-10-01","end":"2017-09-30","val":151000,"accn":"0000010048-17-000011","fy":2017,"fp":"FY","form":"10-K","filed":"2017-12-21","frame":"CY2017"}]}},"ProvedDevelopedAndUndevelopedReservePurchaseOfMineralInPlaceEnergy":{"label":"Proved Developed and Undeveloped Reserve, Purchase of Mineral in Place (Energy)","description":"Energy measure of increase in quantity of proved reserve of oil and gas resulting from purchase of mineral in place, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"Boe":[{"start":"2014-10-01","end":"2015-09-30","val":140000,"accn":"0000010048-15-000008","fy":2015,"fp":"FY","form":"10-K","filed":"2015-12-16"},{"start":"2014-10-01","end":"2015-09-30","val":140000,"accn":"0000010048-16-000021","fy":2016,"fp":"FY","form":"10-K","filed":"2016-12-20","frame":"CY2015"},{"start":"2015-10-01","end":"2016-09-30","val":37000,"accn":"0000010048-16-000021","fy":2016,"fp":"FY","form":"10-K","filed":"2016-12-20"},{"start":"2015-10-01","end":"2016-09-30","val":37000,"accn":"0000010048-17-000011","fy":2017,"fp":"FY","form":"10-K","filed":"2017-12-21","frame":"CY2016"},{"start":"2016-10-01","end":"2017-09-30","val":38000,"accn":"0000010048-17-000011","fy":2017,"fp":"FY","form":"10-K","filed":"2017-12-21","frame":"CY2017"}]}},"ProvedDevelopedAndUndevelopedReserveRevisionOfPreviousEstimateEnergy":{"label":"Proved Developed and Undeveloped Reserve, Revision of Previous Estimate (Energy)","description":"Energy measure of increase (decrease) in quantity of proved reserve of oil and gas related to revision of a previous estimate resulting from new information, except for an increase in proved acreage, or change in economic factors, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe).","units":{"Boe":[{"start":"2012-10-01","end":"2013-09-30","val":242000,"accn":"0001104659-14-087562","fy":2014,"fp":"FY","form":"10-K","filed":"2014-12-18","frame":"CY2013"},{"start":"2013-10-01","end":"2014-09-30","val":499000,"accn":"0001104659-14-087562","fy":2014,"fp":"FY","form":"10-K","filed":"2014-12-18"},{"start":"2013-10-01","end":"2014-09-30","val":499000,"accn":"0000010048-15-000008","fy":2015,"fp":"FY","form":"10-K","filed":"2015-12-16","frame":"CY2014"},{"start":"2014-10-01","end":"2015-09-30","val":-11000,"accn":"0000010048-15-000008","fy":2015,"fp":"FY","form":"10-K","filed":"2015-12-16"},{"start":"2014-10-01","end":"2015-09-30","val":-11000,"accn":"0000010048-16-000021","fy":2016,"fp":"FY","form":"10-K","filed":"2016-12-20","frame":"CY2015"},{"start":"2015-10-01","end":"2016-09-30","val":-251000,"accn":"0000010048-16-000021","fy":2016,"fp":"FY","form":"10-K","filed":"2016-12-20"},{"start":"2015-10-01","end":"2016-09-30","val":-251000,"accn":"0000010048-17-000011","fy":2017,"fp":"FY","form":"10-K","filed":"2017-12-21","frame":"CY2016"},{"start":"2016-10-01","end":"2017-09-30","val":447000,"accn":"0000010048-17-000011","fy":2017,"fp":"FY","form":"10-K","filed":"2017-12-21","frame":"CY2017"}]}},"ProvedDevelopedAndUndevelopedReservesExtensionsDiscoveriesAndAdditions":{"label":"Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions","description":"Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.","units":{"BarrelofOilEquivalen":[{"start":"2010-10-01","end":"2011-09-30","val":176000,"accn":"0001104659-12-083471","fy":2012,"fp":"FY","form":"10-K","filed":"2012-12-12","frame":"CY2011"},{"start":"2011-10-01","end":"2012-09-30","val":63000,"accn":"0001104659-12-083471","fy":2012,"fp":"FY","form":"10-K","filed":"2012-12-12","frame":"CY2012"}]}},"ProvedDevelopedAndUndevelopedReservesNet":{"label":"Proved Developed and Undeveloped Reserves, Net","description":"The net quantity of proved reserves as of the balance sheet date. 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For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent 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Equity, Including Portion Attributable to Noncontrolling Interest","description":"Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent 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