Percentage of revenue from software components.

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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 revenue from software components.

+ References

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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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- Definition

Percentage of segment revenues recorded under percentage of completion method.

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- Definition

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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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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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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-Glossary Diluted Earnings Per Share

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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 floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		1,433	78,166
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit			$ 36.70
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit			$ 37.98
Accumulated other comprehensive loss, net of tax	$ (32,538)	$ (19,186)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(29,200)	(22,300)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	(3,200)	$ 3,100
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price		$ 37.54
Foreign Exchange Forward [Member]
Accumulated other comprehensive loss, net of tax	$ (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
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	131,000	135,000	156,000
Usg [Member]
Percentage of segment revenue from software components	100.00%
Percentage of consolidated revenue from software components	23.00%
Filtration [Member]
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered	87.00%
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered	38.00%
Percentage of segment revenues recorded under percentage of completion method	13.00%
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	27.00%
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered	9.00%
Percentage of segment revenues recorded under percentage of completion method	73.00%
Percentage of consolidated revenues recorded under percentage of completion method	24.00%