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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2017
Other Commitments [Line Items]      
Expected future capital expenditures $ 1,976 $ 433  
Scenario, Forecast | Minimum      
Other Commitments [Line Items]      
Expected future capital expenditures     $ 5,000
Scenario, Forecast | Maximum      
Other Commitments [Line Items]      
Expected future capital expenditures     $ 10,000