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Revenue Recognition - Schedule of Net Accounts Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
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Revenue from Contract with Customer [Abstract] |  |
Billed | $ 2,012,300 | $ 2,184,900
Contract retentions | 674,100 | 696,300
Total accounts receivable—gross | 2,686,400 | 2,881,200
Allowance for doubtful accounts and credit losses | (88,700) | (87,900)
Total accounts receivable—net | $ 2,597,746 | $ 2,793,307

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