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Supporting Financial Information - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Sep. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	$ 17,623		$ 17,623		$ 17,623
Total accumulated amortization	(5,140)		(5,140)		(4,258)
Intangible assets, net	12,483		$ 12,483		13,365
Estimated useful live of intangible assets			10 years
Amortization expense of intangible assets	400	$ 400	$ 900	$ 900
Customer contracts and related customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	16,626		16,626		16,626
Total accumulated amortization	(4,850)		(4,850)		(4,018)
Covenants not to compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	480		480		480
Total accumulated amortization	(140)		(140)		(116)
Trade name
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	517		517		517
Total accumulated amortization	$ (150)		$ (150)		$ (124)

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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