Commitments and Contingencies (Tables)

9 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Summary of Asset Retirement Obligations Activity

The following table summarizes asset retirement obligations activity.

Asset Retirement Obligations	June 30,
(in thousands)	2015
Balance at September 30, 2014	$	5,263
Asset retirement obligations reclassified to liabilities of discontinued operations	(720		)
Subtotal	4,543
Accretion expense	89
Revision in estimated cash flows	(2,879		)
Balance at end of period	$	1,753