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Contract Revenue and Pass-through and Other Revenue - Schedule of Deferred Revenue Remaining Performance Obligations (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Deferred Revenue	$ 13,319	$ 9,639
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Deferred Revenue		$ 3,932
Deferred Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-04-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Deferred Revenue	$ 1,636
Deferred Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2025-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Deferred Revenue	$ 5,498	$ 2,259
Deferred Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2026-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Deferred Revenue	$ 4,163	$ 2,224
Deferred Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2027-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Deferred Revenue	$ 2,022	$ 1,192
Deferred Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2028-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Total Deferred Revenue		$ 32
Deferred Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		1 year

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-SubTopic 10
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

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- Definition

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+ References

No definition available.

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- Definition

Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(1)
-SubTopic 10
-Topic 606
-Publisher FASB
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