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Business Segment Information - Net Sales And Earnings Before Income Tax (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Net Sales	$ 236,658	$ 199,766	$ 193,949	$ 182,597	$ 231,086	$ 192,223	$ 174,778	$ 173,495	$ 812,970	$ 771,582	$ 685,740
Consolidated EBIT									110,600	96,800	84,700
Less: interest expense									(8,396)	(8,748)	(4,578)
Earnings before income taxes									102,216	88,023	80,153
Filtration
Segment Reporting Information [Line Items]
Net Sales									325,735	286,800	279,500
Consolidated EBIT									70,100	58,700	52,200
USG
Segment Reporting Information [Line Items]
Net Sales									211,915	214,000	162,400
Consolidated EBIT									52,200	43,200	36,600
Test
Segment Reporting Information [Line Items]
Net Sales									188,394	182,900	160,900
Consolidated EBIT									25,600	23,800	19,500
Technical Packaging
Segment Reporting Information [Line Items]
Net Sales									86,926	87,900	82,900
Consolidated EBIT									5,900	8,100	8,500
Corporate
Segment Reporting Information [Line Items]
Consolidated EBIT									$ (43,200)	$ (37,000)	$ (32,100)

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