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Discontinued Operations - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 19, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from divestitures   $ 0 $ 85,369 $ 0
Granville-Phillips [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from divestitures $ 87,000