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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
	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