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Summary of Significant Accounting Policies- Additional Information (Details) shares in Thousands | 12 Months Ended
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Sep. 30, 2024 USD ($) segment shares | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Significant Accounting Policies |  |  |
Number of Reportable Segments | segment | 3 |  |
Accumulated other comprehensive loss, net of tax | $ (10,775,000) | $ (23,969,000) |
Cash and cash equivalents held in bank | $ 59,900,000 |  |
Option to extend | true |  |
Research and development expenses | $ 12,000,000.0 | $ 13,000,000.0 | $ 12,300,000
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 | 7.00% |  |
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 | 4.00% |  |
Percentage of segment revenues recorded under percentage of completion method | 80.00% |  |
Percentage of consolidated revenues recorded under percentage of completion method | 16 |  |
Software Contract |  |  |
Significant Accounting Policies |  |  |
Percentage of segment revenues recognized when services are performed or when products are delivered | 4.00% |  |
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 | 48.00% |  |
Percentage of consolidated revenues recognized when services are performed or when products are delivered | 21.00% |  |
Percentage of segment revenues recorded over time | 52.00% |  |
Percentage of consolidate revenues recorded over time | 23.00% |  |

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