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Revenue - Contract Balances (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Sep. 30, 2024
Revenue from Contract with Customer [Abstract] |  |
Contract assets | $ 133,015 | $ 102,827
Contract liabilities | (299,512) | (287,763)
Net contract liability | (166,497) | (184,936)
Revenue recognized related to contract liabilities | 244,400 |
Retention amounts included in accounts receivable | 8,000 | $ 7,100
Retained amount expected to be collected in the next twelve months | 7,500 |
Retained amount expected to be collected | $ 500 |

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