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Revenue Recognition - Schedule of Changes Within Defense Segment Due to Contract Adjustments (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation Of Revenue [Abstract] |  |  |  |
Net sales | $ 5.1 | $ 4.5 | $ 17.3 | $ 28.2
Operating income | 3.2 | 1.6 | 14.1 | 15.2
Net income | $ 2.5 | $ 1.2 | $ 10.8 | $ 11.6
Diluted earnings per share | $ 0.04 | $ 0.02 | $ 0.16 | $ 0.17

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