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Revenue Recognition - Schedule of Increase Within Defense Segment Due to Contract Adjustments (Details) - Defense - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 15.6 | $ 18.0 | $ 24.8 | $ 49.6
Operating income | 10.6 | 11.3 | 14.6 | 41.6
Net income | $ 7.6 | $ 8.7 | $ 10.4 | $ 31.9
Diluted earnings per share | $ 0.11 | $ 0.13 | $ 0.15 | $ 0.45

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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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- Details
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