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Receivables, net - Allowance for Uncollectible Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 9,053	$ 5,634	$ 2,787
Provision for credit losses	7,547	3,319	2,510
Write-offs of credit losses, net of recoveries	(6,224)	(6,640)	(1,345)
Balance at end of period	10,376	9,053	5,634
Concorde Acquisition
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Additions due to opening balance of acquisition	0	6,740	0
MIAT Acquisition
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Additions due to opening balance of acquisition	$ 0	$ 0	$ 1,682

X

- Definition

Amount of allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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X

- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

Amount of expense related to credit loss from transactions other than loan and lease transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Accounts Receivable, Allowance for Credit Loss, Additions Due to Acquisition

+ References

No definition available.

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