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Revenue Recognition - Schedule of Changes Within Defense Segment Due to Contract Adjustments (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation Of Revenue [Abstract] |  |  |
Net sales | $ 31.2 | $ 63.9 | $ 2.2
Operating income | 16.2 | 44.7 | 2.2
Net income | $ 12.4 | $ 34.5 | $ 1.7
Diluted earnings per share | $ 0.18 | $ 0.49 | $ 0.02

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- Definition Increase (decrease) in earnings per share due to margin rate adjustments (in dollars per share) for contracts accounted for using the percentage of completion method. + References No definition available. + Details
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- Definition Increase (decrease) in net income due to margin rate adjustments for contracts accounted for using the percentage of completion method. + References No definition available. + Details
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- Definition Increase (decrease) in net sales due to margin rate adjustments for contracts accounted for using the percentage of completion method. + References No definition available. + Details
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- Definition Increase (decrease) in operating income due to margin rate adjustments for contracts accounted for using the percentage of completion method. + References No definition available. + Details
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- References No definition available. + Details
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