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Revenue - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Revenue from External Customer [Line Items] |  |
Changes in contract estimates related to projects in progress | $ 5.5 | $ 4.3
Transferred over Time | Product Concentration Risk | Revenue from Contract with Customer Benchmark |  |
Revenue from External Customer [Line Items] |  |
Concentration risk, percentage | 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 | 8.00% | 5.00%

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