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A loss would be recognized when the sale price of the investment is less than the carrying value of the investment. 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assets.","units":{"USD":[{"start":"2007-02-01","end":"2008-01-31","val":-102709000,"accn":"0001193125-10-053838","fy":2009,"fp":"FY","form":"10-K","filed":"2010-03-11","frame":"CY2007"},{"start":"2008-02-01","end":"2008-07-31","val":-45791000,"accn":"0001193125-09-180950","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-08-25"},{"start":"2008-05-01","end":"2008-07-31","val":-38154000,"accn":"0001193125-09-180950","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-08-25","frame":"CY2008Q2"},{"start":"2008-02-01","end":"2008-10-31","val":-131705000,"accn":"0001193125-09-242413","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-11-25"},{"start":"2008-08-01","end":"2008-10-31","val":-85914000,"accn":"0001193125-09-242413","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-11-25","frame":"CY2008Q3"},{"start":"2008-02-01","end":"2009-01-31","val":-120997000,"accn":"0001193125-10-053838","fy":2009,"fp":"FY","form":"10-K","filed":"2010-03-11"},{"start":"2008-02-01","end":"2009-01-31","val":-99375000,"accn":"0001193125-11-075314","fy":2010,"fp":"FY","form":"10-K","filed":"2011-03-23","frame":"CY2008"},{"start":"2009-02-01","end":"2009-04-30","val":-256066000,"accn":"0000950130-10-001306","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-05-28","frame":"CY2009Q1"},{"start":"2009-02-01","end":"2009-07-31","val":-413787000,"accn":"0001193125-09-180950","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-08-25"},{"start":"2009-02-01","end":"2009-07-31","val":-413787000,"accn":"0001193125-10-207193","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-09-09"},{"start":"2009-05-01","end":"2009-07-31","val":-157721000,"accn":"0001193125-09-180950","fy":2009,"fp":"Q2","form":"10-Q","filed":"2009-08-25"},{"start":"2009-05-01","end":"2009-07-31","val":-157721000,"accn":"0001193125-10-207193","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-09-09","frame":"CY2009Q2"},{"start":"2009-02-01","end":"2009-10-31","val":-473619000,"accn":"0001193125-09-242413","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-11-25"},{"start":"2009-02-01","end":"2009-10-31","val":-473619000,"accn":"0001193125-10-268895","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-24"},{"start":"2009-08-01","end":"2009-10-31","val":-59832000,"accn":"0001193125-09-242413","fy":2009,"fp":"Q3","form":"10-Q","filed":"2009-11-25"},{"start":"2009-08-01","end":"2009-10-31","val":-59832000,"accn":"0001193125-10-268895","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-24","frame":"CY2009Q3"},{"start":"2009-02-01","end":"2010-01-31","val":-378616000,"accn":"0001193125-10-053838","fy":2009,"fp":"FY","form":"10-K","filed":"2010-03-11"},{"start":"2009-02-01","end":"2010-01-31","val":-378616000,"accn":"0001193125-11-075314","fy":2010,"fp":"FY","form":"10-K","filed":"2011-03-23"},{"start":"2009-02-01","end":"2010-01-31","val":-378616000,"accn":"0001193125-12-107281","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-09","frame":"CY2009"},{"start":"2010-02-01","end":"2010-04-30","val":-509406000,"accn":"0000950130-10-001306","fy":2010,"fp":"Q1","form":"10-Q","filed":"2010-05-28"},{"start":"2010-02-01","end":"2010-04-30","val":-508133000,"accn":"0001193125-11-151778","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-26","frame":"CY2010Q1"},{"start":"2010-02-01","end":"2010-07-31","val":-924770000,"accn":"0001193125-10-207193","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-09-09"},{"start":"2010-02-01","end":"2010-07-31","val":-923497000,"accn":"0001193125-11-241110","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-09-06"},{"start":"2010-05-01","end":"2010-07-31","val":-415364000,"accn":"0001193125-10-207193","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-09-09"},{"start":"2010-05-01","end":"2010-07-31","val":-415364000,"accn":"0001193125-11-241110","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-09-06","frame":"CY2010Q2"},{"start":"2010-02-01","end":"2010-10-31","val":-679781000,"accn":"0001193125-10-268895","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-24"},{"start":"2010-02-01","end":"2010-10-31","val":-679781000,"accn":"0001193125-11-324675","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-29"},{"start":"2010-08-01","end":"2010-10-31","val":243716000,"accn":"0001193125-10-268895","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-11-24"},{"start":"2010-08-01","end":"2010-10-31","val":243716000,"accn":"0001193125-11-324675","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-29","frame":"CY2010Q3"},{"start":"2010-02-01","end":"2011-01-31","val":-1062554000,"accn":"0001193125-11-075314","fy":2010,"fp":"FY","form":"10-K","filed":"2011-03-23"},{"start":"2010-02-01","end":"2011-01-31","val":-1062554000,"accn":"0001193125-12-107281","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-09"},{"start":"2010-02-01","end":"2011-01-31","val":-1062554000,"accn":"0001193125-13-098852","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2010"},{"start":"2011-02-01","end":"2011-04-30","val":79362000,"accn":"0001193125-11-151778","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-05-26"},{"start":"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An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.","units":{"Segment":[{"start":"2014-02-01","end":"2014-04-30","val":1,"accn":"0001445305-14-002370","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-05-30","frame":"CY2014Q1"},{"start":"2014-02-01","end":"2014-07-31","val":1,"accn":"0001108524-14-000009","fy":2015,"fp":"Q2","form":"10-Q","filed":"2014-08-26"},{"start":"2014-02-01","end":"2014-10-31","val":1,"accn":"0001108524-14-000023","fy":2015,"fp":"Q3","form":"10-Q","filed":"2014-11-26"},{"start":"2014-02-01","end":"2015-01-31","val":1,"accn":"0001108524-15-000008","fy":2015,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014"},{"start":"2015-02-01","end":"2015-04-30","val":1,"accn":"0001108524-15-000014","fy":2016,"fp":"Q1","form":"10-Q","filed":"2015-05-22","frame":"CY2015Q1"}],"segment":[{"start":"2015-02-01","end":"2015-07-31","val":1,"accn":"0001108524-15-000025","fy":2016,"fp":"Q2","form":"10-Q","filed":"2015-08-25"},{"start":"2015-02-01","end":"2015-10-31","val":1,"accn":"0001108524-15-000034","fy":2016,"fp":"Q3","form":"10-Q","filed":"2015-11-20"},{"start":"2015-02-01","end":"2016-01-31","val":1,"accn":"0001108524-16-000053","fy":2016,"fp":"FY","form":"10-K","filed":"2016-03-07"},{"start":"2015-02-01","end":"2016-01-31","val":1,"accn":"0001108524-16-000093","fy":null,"fp":null,"form":"8-K","filed":"2016-09-01","frame":"CY2015"},{"start":"2016-02-01","end":"2016-04-30","val":1,"accn":"0001108524-16-000066","fy":2017,"fp":"Q1","form":"10-Q","filed":"2016-05-20","frame":"CY2016Q1"},{"start":"2016-02-01","end":"2016-07-31","val":1,"accn":"0001108524-16-000085","fy":2017,"fp":"Q2","form":"10-Q","filed":"2016-09-01"},{"start":"2016-02-01","end":"2016-10-31","val":1,"accn":"0001108524-16-000128","fy":2017,"fp":"Q3","form":"10-Q","filed":"2016-11-21"},{"start":"2016-02-01","end":"2017-01-31","val":1,"accn":"0001108524-17-000006","fy":2017,"fp":"FY","form":"10-K","filed":"2017-03-06","frame":"CY2016"},{"start":"2017-02-01","end":"2017-04-30","val":1,"accn":"0001108524-17-000012","fy":2018,"fp":"Q1","form":"10-Q","filed":"2017-05-22","frame":"CY2017Q1"},{"start":"2017-02-01","end":"2017-07-31","val":1,"accn":"0001108524-17-000020","fy":2018,"fp":"Q2","form":"10-Q","filed":"2017-08-25"},{"start":"2017-02-01","end":"2017-10-31","val":1,"accn":"0001108524-17-000040","fy":2018,"fp":"Q3","form":"10-Q","filed":"2017-11-22"},{"start":"2017-02-01","end":"2018-01-31","val":1,"accn":"0001108524-18-000011","fy":2018,"fp":"FY","form":"10-K","filed":"2018-03-09","frame":"CY2017"},{"start":"2018-02-01","end":"2018-04-30","val":1,"accn":"0001108524-18-000035","fy":2019,"fp":"Q1","form":"10-Q","filed":"2018-05-31","frame":"CY2018Q1"},{"start":"2018-02-01","end":"2018-07-31","val":1,"accn":"0001108524-18-000057","fy":2019,"fp":"Q2","form":"10-Q","filed":"2018-08-31"},{"start":"2018-02-01","end":"2018-10-31","val":1,"accn":"0001108524-18-000087","fy":2019,"fp":"Q3","form":"10-Q","filed":"2018-11-28"},{"start":"2018-02-01","end":"2019-01-31","val":1,"accn":"0001108524-19-000009","fy":2019,"fp":"FY","form":"10-K","filed":"2019-03-08","frame":"CY2018"},{"start":"2019-02-01","end":"2019-04-30","val":1,"accn":"0001108524-19-000025","fy":2020,"fp":"Q1","form":"10-Q","filed":"2019-06-05","frame":"CY2019Q1"},{"start":"2019-02-01","end":"2019-07-31","val":1,"accn":"0001108524-19-000052","fy":2020,"fp":"Q2","form":"10-Q","filed":"2019-08-23"},{"start":"2019-02-01","end":"2019-10-31","val":1,"accn":"0001108524-19-000076","fy":2020,"fp":"Q3","form":"10-Q","filed":"2019-12-04"},{"start":"2019-02-01","end":"2020-01-31","val":1,"accn":"0001108524-20-000014","fy":2020,"fp":"FY","form":"10-K","filed":"2020-03-05","frame":"CY2019"},{"start":"2020-02-01","end":"2020-04-30","val":1,"accn":"0001108524-22-000007","fy":2021,"fp":"Q1","form":"10-Q","filed":"2020-06-01","frame":"CY2020Q1"},{"start":"2020-02-01","end":"2020-07-31","val":1,"accn":"0001108524-20-000041","fy":2021,"fp":"Q2","form":"10-Q","filed":"2020-08-28"},{"start":"2020-02-01","end":"2020-10-31","val":1,"accn":"0001108524-20-000047","fy":2021,"fp":"Q3","form":"10-Q","filed":"2020-12-04"},{"start":"2020-02-01","end":"2021-01-31","val":1,"accn":"0001108524-21-000014","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-17"},{"start":"2020-02-01","end":"2021-01-31","val":1,"accn":"0001108524-22-000008","fy":2021,"fp":"FY","form":"10-K","filed":"2021-03-17","frame":"CY2020"},{"start":"2021-02-01","end":"2021-04-30","val":1,"accn":"0001108524-21-000030","fy":2022,"fp":"Q1","form":"10-Q","filed":"2021-06-02","frame":"CY2021Q1"},{"start":"2021-02-01","end":"2021-07-31","val":1,"accn":"0001108524-21-000047","fy":2022,"fp":"Q2","form":"10-Q","filed":"2021-08-27"},{"start":"2021-02-01","end":"2021-10-31","val":1,"accn":"0001108524-21-000055","fy":2022,"fp":"Q3","form":"10-Q","filed":"2021-12-02"},{"start":"2021-02-01","end":"2022-01-31","val":1,"accn":"0001108524-22-000013","fy":2022,"fp":"FY","form":"10-K","filed":"2022-03-11","frame":"CY2021"},{"start":"2022-02-01","end":"2022-04-30","val":1,"accn":"0001108524-22-000022","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of Reportable Segments","description":"Number of segments reported by the entity. 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