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Supporting Financial Information - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, gross | $ 65,854 |  | $ 65,854 | $ 65,854
Total accumulated amortization | (23,324) |  | (23,324) | (18,385)
Intangible assets, net | 42,530 |  | $ 42,530 | 47,469
Estimated useful live of intangible assets |  |  | 10 years |
Amortization expense of intangible assets | 1,600 | $ 1,600 | $ 4,900 |
Customer contracts and related customer relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, gross | 62,281 |  | 62,281 | 62,281
Total accumulated amortization | (22,049) |  | (22,049) | (17,378)
Covenants not to compete |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, gross | 522 |  | 522 | 522
Total accumulated amortization | (303) |  | (303) | (264)
Trade name |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, gross | 3,051 |  | 3,051 | 3,051
Total accumulated amortization | $ (972) |  | $ (972) | $ (743)

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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 https://asc.fasb.org/extlink&oid=126954810&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 https://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 https://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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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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