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Revenue Recognition - Schedule of Changes Within Defense Segment Results Due to Contract Adjustments (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation Of Revenue [Abstract] |  |  |
Net sales | $ 13.1 | $ 31.2 | $ 63.9
Operating income | 19.4 | 16.2 | 44.7
Net income | $ 14.9 | $ 12.4 | $ 34.5
Diluted earnings per share | $ 0.21 | $ 0.18 | $ 0.49

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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 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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