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Commitments and Contingencies (Tables)
 12 Months Ended
Sep. 30, 2016
Commitments and Contingencies Disclosure [Abstract]  
Summary of Asset Retirement Obligations Activity
The following table summarizes ARO activity:

Asset Retirement Obligations
September 30,
(in thousands)
2016
Balance at September 30, 2015
$
1,774

Accretion expense
66

Additions in current year
48

Payments and revision in estimated cash flows
(270
)
Balance at September 30, 2016
$
1,618