Inventories (Tables)

12 Months Ended

Sep. 30, 2017

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories comprise the following at September 30:

	2017		2016
Gas Utility natural gas	$	39,486	$	29,223
Materials, supplies and other	13,823		13,117
Total inventories	$	53,309	$	42,340