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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |
Deferred revenue, revenue recognized | $ 39.4 |
Cumulative catch-up adjustment to revenue from change in estimates | (10.9) |
Contractual retainage provisions | 11.5 | $ 13.4
Performance-based | Transferred over Time |  |
Disaggregation of Revenue [Line Items] |  |
Unbilled accounts receivable | 47.0 |
Future Outcomes | Performance-based | Transferred over Time |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue, revenue recognized | 91.3 |
Average Effective Rate | Performance-based | Transferred over Time |  |
Disaggregation of Revenue [Line Items] |  |
Deferred revenue, revenue recognized | $ 144.0 |

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