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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (31,528)		$ (31,528)	$ (27,308)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(30,900)		(30,900)	(28,900)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(500)		(500)	1,700
Research and Development Expense			13,100	14,000	$ 12,200
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	6,300		6,261
Contract Assets [Member]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	35,000		35,000
Inventory [Member]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	30,000		30,000
Retained Earnings [Member]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	5,000		5,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			6,261
Maintenance [Member]
Cost of Goods and Services Sold			13,100	$ 10,400	$ 8,200
Accounting Standards Update 2016-09 [Member]
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent		5.10%		1.10%
Foreign Exchange Forward [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (100)		$ (100)	$ (100)
Maximum [Member] \| Building [Member]
Property, Plant and Equipment, Useful Life			40 years
Maximum [Member] \| Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life			10 years
Maximum [Member] \| Office Furniture And Equipment [Member]
Property, Plant and Equipment, Useful Life			10 years
Minimum [Member] \| Building [Member]
Property, Plant and Equipment, Useful Life			10 years
Minimum [Member] \| Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life			3 years
Minimum [Member] \| Office Furniture And Equipment [Member]
Property, Plant and Equipment, Useful Life			3 years
Usg [Member]
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered			75.00%
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered			21.00%
Percentage Of Segment Revenues Recognized On Straight Line Basis			17.00%
Percentage Of Consolidated Revenues Recognized On Straight Line Basis			5.00%
Filtration [Member]
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered			85.00%
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered			31.00%
Percentage of segment revenues recorded under percentage of completion method			15.00%
Percentage of consolidated revenues recorded under percentage of completion method			6.00%
Test [Member]
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered			25.00%
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered			6.00%
Percentage of segment revenues recorded under percentage of completion method			75.00%
Percentage of consolidated revenues recorded under percentage of completion method			18.00%
Technical Packaging [Member]
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered			100.00%
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered			11.00%
Software Contract [Member]
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered			8.00%
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered			2.00%