Inventories (Tables)

3 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories comprise the following:

	December 31, 2017		September 30, 2017		December 31, 2016
Gas Utility natural gas	$	34,587	$	39,486	$	25,777
Materials, supplies and other	15,130		13,823		13,916
Total inventories	$	49,717	$	53,309	$	39,693