REVENUES - Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Disaggregation of revenues
Revenues	$ 289,659	$ 214,593
Point in time
Disaggregation of revenues
Revenues	144,040	126,064
Over time
Disaggregation of revenues
Revenues	145,619	88,529
United States
Disaggregation of revenues
Revenues	189,992	153,861
International
Disaggregation of revenues
Revenues	99,667	60,732
Commercial
Disaggregation of revenues
Revenues	177,852	166,383
Government
Disaggregation of revenues
Revenues	111,807	48,210
A&D
Disaggregation of revenues
Revenues	143,829	81,868
A&D \| Point in time
Disaggregation of revenues
Revenues	66,534	46,995
A&D \| Over time
Disaggregation of revenues
Revenues	77,295	34,873
A&D \| United States
Disaggregation of revenues
Revenues	92,786	65,314
A&D \| International
Disaggregation of revenues
Revenues	51,043	16,554
A&D \| Commercial
Disaggregation of revenues
Revenues	45,796	45,755
A&D \| Government
Disaggregation of revenues
Revenues	98,033	36,113
Test
Disaggregation of revenues
Revenues	58,346	46,065
Test \| Point in time
Disaggregation of revenues
Revenues	9,217	9,791
Test \| Over time
Disaggregation of revenues
Revenues	49,129	36,274
Test \| United States
Disaggregation of revenues
Revenues	36,482	28,630
Test \| International
Disaggregation of revenues
Revenues	21,864	17,435
Test \| Commercial
Disaggregation of revenues
Revenues	46,317	36,349
Test \| Government
Disaggregation of revenues
Revenues	12,029	9,716
USG
Disaggregation of revenues
Revenues	87,484	86,660
USG \| Point in time
Disaggregation of revenues
Revenues	68,289	69,278
USG \| Over time
Disaggregation of revenues
Revenues	19,195	17,382
USG \| United States
Disaggregation of revenues
Revenues	60,724	59,917
USG \| International
Disaggregation of revenues
Revenues	26,760	26,743
USG \| Commercial
Disaggregation of revenues
Revenues	85,739	84,279
USG \| Government
Disaggregation of revenues
Revenues	$ 1,745	$ 2,381

ESCO TECHNOLOGIES INC 10-Q