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Summary of Significant Accounting Policies- Additional Information (Details) | 12 Months Ended
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Sep. 30, 2022 USD ($) segment | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
Significant Accounting Policies |  |  |
Number of Reportable Segments | segment | 3 |  |
Accumulated other comprehensive loss, net of tax | $ (31,764,000) | $ (2,161,000) |
Option to extend | true |  |
Research and development expenses | $ 12,300,000 | $ 15,400,000 | $ 13,300,000
Fair value of financial instruments | $ 0 |  |
Maximum |  |  |
Significant Accounting Policies |  |  |
Lease term | 20 years |  |
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 |  |  |
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 | 80.00% |  |
Percentage of consolidated revenues recognized when services are performed or when products are delivered | 25.00% |  |
Percentage of segment revenues recognized on straight line basis | 20.00% |  |
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 | 25.00% |  |
Percentage of consolidated revenues recognized when services are performed or when products are delivered | 7.00% |  |
Percentage of segment revenues recorded under percentage of completion method | 75.00% |  |
Percentage of consolidated revenues recorded under percentage of completion method | 20 |  |
Software Contract |  |  |
Significant Accounting Policies |  |  |
Percentage of segment revenues recognized when services are performed or when products are delivered | 6.00% |  |
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 | 40.00% |  |
Percentage of consolidated revenues recognized when services are performed or when products are delivered | 17.00% |  |
Percentage of segment revenues recorded over time | 60.00% |  |
Percentage of consolidate revenues recorded over time | 25.00% |  |

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