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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
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Abstract]
Net sales	$ 16.1	$ 7.6
Operating income	14.8	3.8
Net income	$ 11.3	$ 3.0
Diluted earnings per share	$ 0.16	$ 0.04

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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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X

- 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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X

- 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.

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