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Business Segment Information - Schedule Of Capital Expenditures (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Capital Expenditures	$ 36.2	$ 22.4	$ 32.1
Operating Segments | A&D
Capital Expenditures	23.8	12.9	9.4
Operating Segments | USG
Capital Expenditures	8.8	4.9	14.4
Operating Segments | Test
Capital Expenditures	3.5	4.5	8.3
Corporate
Capital Expenditures	$ 0.1	$ 0.1	$ 0.0

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- Definition

Amount of expenditure for addition to long-lived assets included in determination of segment assets by chief operating decision maker (CODM) or otherwise regularly provided to CODM. Excludes expenditure for addition to financial instrument, long-term customer relationship of financial institution, mortgage and other servicing rights, deferred policy acquisition cost, and deferred tax assets.

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