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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
	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