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Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"end":"2016-09-30","val":16416000,"accn":"0001564590-18-013144","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-05-11","frame":"CY2016Q3I"},{"end":"2017-03-31","val":19116000,"accn":"0001564590-18-013144","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-05-11","frame":"CY2017Q1I"},{"end":"2017-09-30","val":19804000,"accn":"0001564590-18-013144","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-05-11","frame":"CY2017Q3I"},{"end":"2018-03-31","val":17942000,"accn":"0001564590-18-013144","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-05-11","frame":"CY2018Q1I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations","description":"Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. 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Excludes employee stock ownership plan (ESOP).","units":{"shares":[{"start":"2011-05-01","end":"2011-05-31","val":150000,"accn":"0001193125-14-010946","fy":2013,"fp":"FY","form":"10-K","filed":"2014-01-14"}]}},"StockIssuedDuringPeriodSharesStockOptionsExercised":{"label":"Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period","description":"Number of share options (or share units) exercised during the current period.","units":{"shares":[{"start":"2011-10-01","end":"2012-09-30","val":800,"accn":"0001193125-12-518502","fy":2012,"fp":"FY","form":"10-K","filed":"2012-12-28","frame":"CY2012"}]}},"StockIssuedDuringPeriodValueConversionOfConvertibleSecurities":{"label":"Stock Issued During Period, Value, Conversion of Convertible Securities","description":"The gross value of stock issued during the period upon the conversion of convertible securities.","units":{"USD":[{"start":"2012-10-01","end":"2013-09-30","val":2290000,"accn":"0001193125-14-010946","fy":2013,"fp":"FY","form":"10-K","filed":"2014-01-14"},{"start":"2012-10-01","end":"2013-09-30","val":2290000,"accn":"0001193125-14-452885","fy":2014,"fp":"FY","form":"10-K","filed":"2014-12-23"},{"start":"2012-10-01","end":"2013-09-30","val":2290000,"accn":"0001193125-16-421487","fy":2015,"fp":"FY","form":"10-K","filed":"2016-01-05","frame":"CY2013"}]}},"StockIssuedDuringPeriodValueNewIssues":{"label":"Stock Issued During Period, Value, New Issues","description":"Equity impact of the value of new stock issued during the period. 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