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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)

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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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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. + References No definition available. + Details
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