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REVENUES - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | $ 218,314 | $ 205,501
Point in time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 114,148 | 98,736
Over time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 104,166 | 106,765
United States |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 158,114 | 142,816
International |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 60,200 | 62,685
Commercial |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 153,765 | 152,894
Government |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 64,549 | 52,607
A&D |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 94,733 | 82,983
A&D | Point in time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 39,465 | 33,604
A&D | Over time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 55,268 | 49,379
A&D | United States |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 79,901 | 68,934
A&D | International |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 14,832 | 14,049
A&D | Commercial |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 37,209 | 36,740
A&D | Government |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 57,524 | 46,243
USG |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 82,984 | 71,045
USG | Point in time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 66,703 | 56,031
USG | Over time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 16,281 | 15,014
USG | United States |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 55,961 | 46,379
USG | International |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 27,023 | 24,666
USG | Commercial |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 81,469 | 70,162
USG | Government |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 1,515 | 883
Test |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 40,597 | 51,473
Test | Point in time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 7,980 | 9,101
Test | Over time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 32,617 | 42,372
Test | United States |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 22,252 | 27,503
Test | International |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 18,345 | 23,970
Test | Commercial |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 35,087 | 45,992
Test | Government |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | $ 5,510 | $ 5,481

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