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Quarterly Results of Operations (Unaudited) - Schedule of Quarterly Financial Information (Details) (Parenthetical) - USD ($)	3 Months Ended												12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Loss on disposition of assets			$ 1,600,000										$ (2,162,000)	$ 838,000	$ (388,000)
Asset impairment	$ 3,200,000		$ 1,600,000		$ 6,200,000	$ 1,400,000							4,736,000	7,639,000	3,492,000
Deferred income tax benefit				$ 9,700,000									(6,775,000)	2,273,000	1,143,000
Effective income tax expense rate	202.20%	25.30%	24.20%	134.30%	99.60%	32.90%	33.70%	33.30%	(109.00%)	43.00%	5.20%	35.90%
Income tax expense (benefit)					$ 1,300,000								$ (3,118,000)	$ 6,359,000	2,373,000
Settlement of lawsuits									$ 1,100,000			$ 540,000			$ 1,900,000

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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