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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Retirement Benefits [Abstract] |  |  |
Net loss in AOCI expected to be recognized during next fiscal year | $ 4.4 |  |
Aggregate contributions charged to operations | $ 12.0 | $ 11.7 | $ 10.7

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