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Percentage of revenues recognized when services are performed for unaffiliated customers or when products are delivered.

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Percentage Of Revenues Recorded Under Percentage Of Completion Method

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The amount of segment revenues recognized on straight line basis that generated during the period.

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Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Aggregate fair value of all derivative liabilities designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Summary of Significant Accounting Policies- Additional Information (Details) shares in Thousands	12 Months Ended
	Sep. 30, 2023 USD ($) segment shares	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Significant Accounting Policies
Number of Reportable Segments \| segment	3
Accumulated other comprehensive loss, net of tax	$ (23,969,000)	$ (31,764,000)
Cash and cash equivalents held in bank	$ 35,200,000
Option to extend	true
Research and development expenses	$ 13,000,000.0	$ 12,300,000	$ 15,400,000
Number of Anti dilutive shares \| shares	0
Fair value of financial instruments	$ 0
Maximum
Significant Accounting Policies
Lease term	20 years
Maximum \| Capitalized software
Significant Accounting Policies
Estimated useful lives	7 years
Maximum \| Building
Significant Accounting Policies
Estimated useful lives	40 years
Maximum \| Machinery and Equipment
Significant Accounting Policies
Estimated useful lives	10 years
Maximum \| Office Furniture And Equipment
Significant Accounting Policies
Estimated useful lives	10 years
Minimum \| Capitalized software
Significant Accounting Policies
Estimated useful lives	3 years
Minimum \| Building
Significant Accounting Policies
Estimated useful lives	10 years
Minimum \| Machinery and Equipment
Significant Accounting Policies
Estimated useful lives	3 years
Minimum \| Office Furniture And Equipment
Significant Accounting Policies
Estimated useful lives	3 years
USG Segment
Significant Accounting Policies
Percentage of segment revenues recognized when services are performed or when products are delivered	82.00%
Percentage of consolidated revenues recognized when services are performed or when products are delivered	29.00%
Percentage of segment revenues recognized on straight line basis	18.00%
Percentage on consolidated revenues recognized on straight line basis	6.00%
Test Segment
Significant Accounting Policies
Percentage of segment revenues recognized when services are performed or when products are delivered	20.00%
Percentage of consolidated revenues recognized when services are performed or when products are delivered	5.00%
Percentage of segment revenues recorded under percentage of completion method	80.00%
Percentage of consolidated revenues recorded under percentage of completion method	19
Software Contract
Significant Accounting Policies
Percentage of segment revenues recognized when services are performed or when products are delivered	5.00%
Percentage of consolidated revenues recognized when services are performed or when products are delivered	2.00%
Aero Space Defense
Significant Accounting Policies
Percentage of segment revenues recognized when services are performed or when products are delivered	45.00%
Percentage of consolidated revenues recognized when services are performed or when products are delivered	19.00%
Percentage of segment revenues recorded over time	55.00%
Percentage of consolidate revenues recorded over time	22.00%