REVENUES (Schedule Of Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 182,597	$ 173,495
Point in time [Member]
Disaggregation of Revenue [Line Items]
Revenues	86,739
Over time [Member]
Disaggregation of Revenue [Line Items]
Revenues	95,858
United States [Member]
Disaggregation of Revenue [Line Items]
Revenues	133,377
International [Member]
Disaggregation of Revenue [Line Items]
Revenues	49,220
Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenues	147,596
U S Government [Member]
Disaggregation of Revenue [Line Items]
Revenues	35,001
Filtration [Member]
Disaggregation of Revenue [Line Items]
Revenues	66,224	60,035
Filtration [Member] | Point in time [Member]
Disaggregation of Revenue [Line Items]
Revenues	32,054
Filtration [Member] | Over time [Member]
Disaggregation of Revenue [Line Items]
Revenues	34,170
Filtration [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenues	54,847
Filtration [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	11,377
Filtration [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenues	37,523
Filtration [Member] | U S Government [Member]
Disaggregation of Revenue [Line Items]
Revenues	28,701
Test [Member]
Disaggregation of Revenue [Line Items]
Revenues	41,286	37,530
Test [Member] | Point in time [Member]
Disaggregation of Revenue [Line Items]
Revenues	10,382
Test [Member] | Over time [Member]
Disaggregation of Revenue [Line Items]
Revenues	30,904
Test [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenues	28,453
Test [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	12,833
Test [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenues	36,297
Test [Member] | U S Government [Member]
Disaggregation of Revenue [Line Items]
Revenues	4,989
USG [Member]
Disaggregation of Revenue [Line Items]
Revenues	55,855	55,754
USG [Member] | Point in time [Member]
Disaggregation of Revenue [Line Items]
Revenues	44,303
USG [Member] | Over time [Member]
Disaggregation of Revenue [Line Items]
Revenues	11,552
USG [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenues	40,228
USG [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	15,627
USG [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenues	54,662
USG [Member] | U S Government [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,193
Technical Packaging [Member]
Disaggregation of Revenue [Line Items]
Revenues	19,232	$ 20,176
Technical Packaging [Member] | Point in time [Member]
Disaggregation of Revenue [Line Items]
Revenues	0
Technical Packaging [Member] | Over time [Member]
Disaggregation of Revenue [Line Items]
Revenues	19,232
Technical Packaging [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Revenues	9,849
Technical Packaging [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues	9,383
Technical Packaging [Member] | Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenues	19,114
Technical Packaging [Member] | U S Government [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 118