Commitments and Contingencies (Tables)

6 Months Ended

Mar. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Summary of Asset Retirement Obligations Activity

The following table summarizes ARO activity:

Asset Retirement Obligations	March 31,
(in thousands)	2016
Balance at September 30, 2015	$	1,774
Accretion expense	30
Payments and revision in estimated cash flows	(264		)
Balance at March 31, 2016	$	1,540