BUSINESS SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)
BUSINESS SEGMENT INFORMATION
NET SALES	$ 204,928	$ 165,894	$ 381,938	$ 328,568
Consolidated EBIT	22,688	20,581	38,258	37,662
Less: Interest expense	(1,020)	(432)	(1,753)	(973)
Earnings before income taxes	21,668	20,149	$ 36,505	36,689
Number of reportable segments | segment			3
A&D
BUSINESS SEGMENT INFORMATION
NET SALES	84,821	82,528	$ 155,065	149,144
Consolidated EBIT	14,349	17,006	24,304	25,266
USG
BUSINESS SEGMENT INFORMATION
NET SALES	64,191	39,555	127,676	94,095
Consolidated EBIT	11,314	6,725	24,705	19,456
Test
BUSINESS SEGMENT INFORMATION
NET SALES	55,916	43,811	99,197	85,329
Consolidated EBIT	8,494	5,688	12,459	11,030
Reconciliation to consolidated totals (Corporate) [Member]
BUSINESS SEGMENT INFORMATION
Consolidated EBIT	$ (11,469)	$ (8,838)	$ (23,210)	$ (18,090)