Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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The net amount of operating interest income (expense).

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Business Segment Information (Schedule Of Net Sales And Earnings Before Income Tax) (Details) - USD ($) $ in Thousands			1 Months Ended					3 Months Ended								12 Months Ended
	Mar. 14, 2018	May 08, 2017	Aug. 30, 2017	May 25, 2017	Nov. 07, 2016	Sep. 02, 2016	Jan. 29, 2016	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
NET SALES	$ 8,000	$ 45,000	$ 14,000	$ 25,000	$ 40,000	$ 25,000	$ 35,000	$ 231,086	$ 192,223	$ 174,778	$ 173,495	$ 207,005	$ 171,189	$ 161,178	$ 146,368	$ 771,582	$ 685,740	$ 571,459
Consolidated EBIT																96,800	84,700	69,700
Less: interest expense																(8,748)	(4,578)	(1,308)
Earnings before income tax																88,023	80,153	68,420
Filtration [Member]
Segment Reporting Information [Line Items]
NET SALES																286,800	279,500	207,800
Consolidated EBIT																58,700	52,200	45,200
Test [Member]
Segment Reporting Information [Line Items]
NET SALES																182,900	160,900	161,500
Consolidated EBIT																23,800	19,500	13,900
USG [Member]
Segment Reporting Information [Line Items]
NET SALES																214,000	162,400	127,800
Consolidated EBIT																43,200	36,600	31,100
Technical Packaging [Member]
Segment Reporting Information [Line Items]
NET SALES																87,900	82,900	74,400
Consolidated EBIT																8,100	8,500	9,600
Reconciliation to consolidated totals (Corporate) [Member]
Segment Reporting Information [Line Items]
Consolidated EBIT																$ (37,000)	$ (32,100)	$ (30,100)