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Supporting Financial Information - Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Sep. 30, 2017
Finite Lived Intangible Assets [Roll Forward] |  |  |  |
Goodwill, net | $ 25,989 |  | $ 25,989 | $ 25,989
Intangible assets, including goodwill, gross balance |  |  |  | 43,612
Accumulated amortization finite-lived intangibles, beginning balance |  |  | (2,496) |
Current period amortization | (400) | $ (400) | (881) |
Accumulated amortization finite-lived intangibles, ending balance | (3,377) |  | (3,377) |
Finite-lived intangibles, net balance | 14,246 |  | 14,246 |
Intangible assets, including goodwill, net balance | 40,235 |  | $ 40,235 |
Estimated useful live of finite-lived intangible assets |  |  | 10 years |
Customer Relationships [Member] |  |  |  |
Finite Lived Intangible Assets [Roll Forward] |  |  |  |
Finite-lived intangible assets, gross balance |  |  |  | 16,626
Accumulated amortization finite-lived intangibles, beginning balance |  |  | $ (2,355) |
Current period amortization |  |  | (831) |
Accumulated amortization finite-lived intangibles, ending balance | (3,186) |  | (3,186) |
Finite-lived intangibles, net balance | 13,440 |  | 13,440 |
Noncompete Agreements [Member] |  |  |  |
Finite Lived Intangible Assets [Roll Forward] |  |  |  |
Finite-lived intangible assets, gross balance |  |  |  | 480
Accumulated amortization finite-lived intangibles, beginning balance |  |  | (68) |
Current period amortization |  |  | (24) |
Accumulated amortization finite-lived intangibles, ending balance | (92) |  | (92) |
Finite-lived intangibles, net balance | 388 |  | 388 |
Trade Names [Member] |  |  |  |
Finite Lived Intangible Assets [Roll Forward] |  |  |  |
Finite-lived intangible assets, gross balance |  |  |  | $ 517
Accumulated amortization finite-lived intangibles, beginning balance |  |  | (73) |
Current period amortization |  |  | (26) |
Accumulated amortization finite-lived intangibles, ending balance | (99) |  | (99) |
Finite-lived intangibles, net balance | $ 418 |  | $ 418 |

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- Definition Finite Lived Intangible Assets Total [Roll Forward] + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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