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et 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Retirement Obligation, Revision of Estimate","description":"Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the 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An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.","units":{"USD":[{"end":"2010-10-31","val":27494,"accn":"0000949353-11-000304","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-09-13"},{"end":"2010-10-31","val":27494,"accn":"0000949353-12-000048","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-14"},{"end":"2010-10-31","val":27494,"accn":"0000949353-12-000195","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-12-04","frame":"CY2010Q3I"},{"end":"2011-07-31","val":30734,"accn":"0000949353-11-000304","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-09-13","frame":"CY2011Q2I"},{"end":"2011-10-31","val":26335,"accn":"0000949353-12-000048","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-14"},{"end":"2011-10-31","val":26335,"accn":"0000949353-12-000061","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-03-15"},{"end":"2011-10-31","val":26335,"accn":"0000949353-12-000119","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-06-14"},{"end":"2011-10-31","val":26335,"accn":"0001144204-12-055860","fy":2012,"fp":"Q3","form":"10-Q/A","filed":"2012-10-12"},{"end":"2011-10-31","val":26335,"accn":"0000949353-12-000195","fy":2011,"fp":"FY","form":"10-K/A","filed":"2012-12-04"},{"end":"2011-10-31","val":26335,"accn":"0000949353-13-000027","fy":2012,"fp":"FY","form":"10-K","filed":"2013-01-31","frame":"CY2011Q3I"},{"end":"2012-01-31","val":27125,"accn":"0000949353-12-000061","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-03-15","frame":"CY2011Q4I"},{"end":"2012-04-30","val":27915,"accn":"0000949353-12-000119","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-06-14","frame":"CY2012Q1I"},{"end":"2012-07-31","val":28705,"accn":"0001144204-12-055860","fy":2012,"fp":"Q3","form":"10-Q/A","filed":"2012-10-12","frame":"CY2012Q2I"},{"end":"2012-10-31","val":27554,"accn":"0000949353-13-000027","fy":2012,"fp":"FY","form":"10-K","filed":"2013-01-31"},{"end":"2012-10-31","val":27554,"accn":"0000949353-13-000049","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-03-18"},{"end":"2012-10-31","val":27554,"accn":"0000949353-13-000090","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-06-11"},{"end":"2012-10-31","val":27554,"accn":"0000949353-13-000145","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-09-16"},{"end":"2012-10-31","val":27554,"accn":"0000949353-14-000026","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-01-30","frame":"CY2012Q3I"},{"end":"2013-01-31","val":28381,"accn":"0000949353-13-000049","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-03-18","frame":"CY2012Q4I"},{"end":"2013-04-30","val":29208,"accn":"0000949353-13-000090","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-06-11","frame":"CY2013Q1I"},{"end":"2013-07-31","val":30035,"accn":"0000949353-13-000145","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-09-16","frame":"CY2013Q2I"},{"end":"2013-10-31","val":31636,"accn":"0000949353-14-000026","fy":2013,"fp":"FY","form":"10-K/A","filed":"2014-01-30"},{"end":"2013-10-31","val":31636,"accn":"0000949353-14-000072","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-03-17"},{"end":"2013-10-31","val":31636,"accn":"0001144204-14-037769","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-06-16"},{"end":"2013-10-31","val":31636,"accn":"0000949353-14-000128","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-09-18"},{"end":"2013-10-31","val":31636,"accn":"0000949353-15-000037","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-17","frame":"CY2013Q3I"},{"end":"2014-01-31","val":32408,"accn":"0000949353-14-000072","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-03-17","frame":"CY2013Q4I"},{"end":"2014-04-30","val":33357,"accn":"0001144204-14-037769","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-06-16","frame":"CY2014Q1I"},{"end":"2014-07-31","val":34306,"accn":"0000949353-14-000128","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-09-18","frame":"CY2014Q2I"},{"end":"2014-10-31","val":34754,"accn":"0000949353-15-000037","fy":2014,"fp":"FY","form":"10-K","filed":"2015-02-17"},{"end":"2014-10-31","val":34754,"accn":"0000949353-15-000054","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-03-16"},{"end":"2014-10-31","val":34754,"accn":"0000949353-15-000100","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-06-15"},{"end":"2014-10-31","val":34754,"accn":"0000949353-15-000115","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-09-21","frame":"CY2014Q3I"},{"end":"2015-01-31","val":35716,"accn":"0000949353-15-000054","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-03-16","frame":"CY2014Q4I"},{"end":"2015-04-30","val":36763,"accn":"0000949353-15-000100","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-06-15","frame":"CY2015Q1I"},{"end":"2015-07-31","val":37810,"accn":"0000949353-15-000115","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-09-21","frame":"CY2015Q2I"}]}},"Assets":{"label":"Assets","description":"Sum 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