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Supporting Financial Information - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Sep. 30, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, gross | $ 65,854 |  | $ 65,854 |  |  | $ 64,412
Total accumulated amortization | (15,092) |  | (15,092) |  |  | (11,800)
Intangible assets, net | 50,762 |  | $ 50,762 |  |  | 52,612
Estimated useful live of intangible assets |  |  | 10 years |  |  |
Amortization expense of intangible assets | 1,600 | $ 1,200 | $ 3,300 | $ 2,400 |  |
IBA |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, gross |  |  |  |  | $ 17,700 | 16,223
Customer contracts and related customer relationships |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, gross | 62,281 |  | 62,281 |  |  | 45,600
Total accumulated amortization | (14,264) |  | (14,264) |  |  | (11,150)
Customer contracts and related customer relationships | IBA |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, gross |  |  |  |  | 16,700 |
Covenants not to compete |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, gross | 522 |  | 522 |  |  | 480
Total accumulated amortization | (238) |  | (238) |  |  | (212)
Covenants not to compete | IBA |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, gross |  |  |  |  | 100 |
Trade name |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, gross | 3,051 |  | 3,051 |  |  | 2,109
Total accumulated amortization | $ (590) |  | $ (590) |  |  | $ (438)
Trade name | IBA |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, gross |  |  |  |  | $ 900 |

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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=121586364&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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