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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
Operating lease liabilities	us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent	us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent			us-gaap:OperatingLeaseLiability
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