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Revenue - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Revenue from External Customer [Line Items] |  |  |  |
Changes in contract estimates related to projects in progress |  |  | $ 11.4 | $ 10.8
Transferred over Time | Product Concentration Risk | Revenue from Contract with Customer Benchmark |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk, percentage | 93.00% | 95.00% | 92.00% | 95.00%
Transferred at Point in Time | Product Concentration Risk | Revenue from Contract with Customer Benchmark |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk, percentage | 7.00% | 5.00% | 8.00% | 5.00%

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