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Supporting Financial Information - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization expense of intangible assets | $ 4.1 | $ 4.3 | $ 8.2 | $ 6.5
Intangible assets, remaining amortization period | 7 years 9 months 18 days |  | 7 years 9 months 18 days |
Depreciation | $ 0.1 | $ 0.2 | $ 0.3 | $ 0.4
Customer contracts and related customer relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, remaining amortization period | 7 years 8 months 12 days |  | 7 years 8 months 12 days |
Backlog |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, remaining amortization period | 8 years 1 month 6 days |  | 8 years 1 month 6 days |
Trade name |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, remaining amortization period | 8 years 2 months 12 days |  | 8 years 2 months 12 days |
Covenants not to compete |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, remaining amortization period | 5 years 8 months 12 days |  | 5 years 8 months 12 days |

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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 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 926 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483154/926-20-50-5 + Details
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