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Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) segment | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Oct. 01, 2019 USD ($)
Number of reportable segments | segment |  | 3 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (3,657) | $ (3,657) | $ (43,974) |  |
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax |  |  | (37,000) |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | (3,700) | (3,700) | (7,000) |  |
Research and Development Expense |  | 13,300 | 12,100 | $ 10,900 |
Asset Impairment Charges | 0 | $ 0 |  |  |
Warranty period |  | 12 months |  |  |
Operating lease assets | $ 21,390 | $ 21,390 |  |  | $ 20,000
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Option to extend |  | true |  |  |
Maintenance [Member] |  |  |  |  |
Cost of Goods and Services Sold |  | $ 16,100 | $ 15,800 | $ 13,100 |
Maximum |  |  |  |  |
Lease term | 20 years | 20 years |  |  |
Maximum | Building [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |  |  |
Maximum | Machinery and Equipment [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |  |
Maximum | Office Furniture And Equipment [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |  |
Minimum | Building [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |  |  |
Minimum | Machinery and Equipment [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |  |
Minimum | Office Furniture And Equipment [Member] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |  |
USG |  |  |  |  |
Percentage of segment revenues recognized when services are performed or when products are delivered |  | 75.00% |  |  |
Percentage of consolidated revenues recognized when services are performed or when products are delivered |  | 20.00% |  |  |
Revenue recognized when products were delivered or services performed under ASC 605 (as a percent) |  |  |  | 75.00% |
Revenue recognized using percentage of completion method under ASC 605 (as a percent) |  |  |  | 25.00% |
Percentage Of Segment Revenues Recognized On Straight Line Basis |  | 25.00% |  |  |
Percentage Of Consolidated Revenues Recognized On Straight Line Basis |  | 7.00% |  |  |
Aerospace & Defense |  |  |  |  |
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 |  | 22.00% |  |  |
Percentage Of Segment Revenues Recognized Over Time, Costs Incurred Plus Margin | 55.00% | 55.00% |  |  |
Percentage Of Consolidated Revenues Recognized Over Time, Costs Incurred Plus Margin | 26.00% | 26.00% |  |  |
Revenue recognized when products were delivered or services performed under ASC 605 (as a percent) |  |  |  | 85.00% |
Revenue recognized using percentage of completion method under ASC 605 (as a percent) |  |  |  | 15.00% |
Test |  |  |  |  |
Percentage of segment revenues recognized when services are performed or when products are delivered |  | 18.00% |  |  |
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 |  | 82.00% |  |  |
Percentage of consolidated revenues recorded under percentage of completion method |  | 20.00% |  |  |
Revenue recognized when products were delivered or services performed under ASC 605 (as a percent) |  |  |  | 25.00% |
Revenue recognized using percentage of completion method under ASC 605 (as a percent) |  |  |  | 75.00% |
Software Contract |  |  |  |  |
Percentage of segment revenues recognized when services are performed or when products are delivered |  | 10.00% |  |  |
Percentage of consolidated revenues recognized when services are performed or when products are delivered |  | 2.00% |  |  |
Software Development | Maximum |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 7 years |  |  |
Software Development | Minimum |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |  |

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