Discontinued Operations (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended
	Apr. 02, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operation, Cash Price Received from Disposal of Discontinued Operation	$ 153,000,000
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]
Operating revenues		0	0	0	37,962,000
Purchased gas cost		0	0	0	21,464,000
Gross profit		0	0	0	16,498,000
Operating expenses		0	0	0	5,858,000
Operating income		0	0	0	10,640,000
Miscellaneous income (expense)		0	0	0	548,000
Income from discontinued operations before income taxes		0	0	0	11,188,000
Income tax expense		0	0	0	3,986,000
Income (loss) from discontinued operations		0	0	0	7,202,000
Gain (loss) on sale of discontinued operations, net of tax	5,300,000	0	5,294,000	0	5,294,000
Net income (loss) from discontinued operations		$ 0	$ 5,294,000	$ 0	$ 12,496,000