The amount of consolidated revenues recognized on straight line basis that generated during the period.

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The amount of segment revenues recognized on straight line basis that generated during the period.

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Percentage of revenues recognized when services are performed for unaffiliated customers or when products are delivered.

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Percentage of revenues recorded under percentage of completion method.

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Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered.

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Percentage of segment revenues recorded under percentage of completion method.

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Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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-Publisher FASB
-Name Accounting Standards Codification
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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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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deductions.

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Costs incurred and are directly related to generating maintenance revenues. Also includes cost of maintenance on client contracts.

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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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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Accumulated other comprehensive loss, net of tax		$ (27,308)	$ (39,283)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax		(28,900)	(34,500)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax		1,700	(4,700)
Research and Development Expense		14,000	12,200	$ 18,100
Maintenance Costs		$ 10,400	8,200	$ 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 loss, net of tax		$ (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		78.00%
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered		18.00%
Percentage Of Segment Revenues Recognized On Straight Line Basis		22.00%
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		86.00%
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered		36.00%
Percentage of segment revenues recorded under percentage of completion method		14.00%
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		30.00%
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered		7.00%
Percentage of segment revenues recorded under percentage of completion method		70.00%
Percentage of consolidated revenues recorded under percentage of completion method		16.00%
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		12.00%