Business Segment Information (Schedule Of Depreciation And Amortization) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Depreciation and Amortization	$ 23,568	$ 18,584	$ 16,362
Filtration [Member]
Depreciation and Amortization	4,000	3,800	4,000
Test [Member]
Depreciation and Amortization	3,600	3,100	2,700
USG [Member]
Depreciation and Amortization	8,100	6,200	4,800
Corporate [Member]
Depreciation and Amortization	5,000	4,100	3,700
Technical Packaging [Member]
Depreciation and Amortization	$ 2,900	$ 1,400	$ 1,200