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Contract Assets and Liabilities - Reconciliation of Net Billings in Excess of Costs and Estimated Earnings (Details) - USD ($) $ in Thousands | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts |  |
Contract asset, beginning balance | $ 25,966 | $ 27,296
Changes in revenue billed, contract price or cost estimates | 28,598 | 5,254
Contract asset, ending balance | 54,564 | 32,550
Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts |  |
Contract liability, beginning balance | (120,065) | (78,905)
Changes in revenue billed, contract price or cost estimates | (4,087) | (34,290)
Contract liability, ending balance | (124,152) | (113,195)
Net Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts |  |
Net billings in excess of costs, beginning balance | (94,099) | (51,609)
Changes in revenue billed, contract price or cost estimates | 24,511 | (29,036)
Net billings in excess of costs, Ending balance | $ (69,588) | $ (80,645)

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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