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REVENUES - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | $ 177,010 | $ 162,674
Point in time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 92,214 | 78,181
Over time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 84,796 | 84,493
United States [Member] |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 122,403 | 117,849
International |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 54,607 | 44,825
Commercial |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 131,954 | 118,190
Government [Member] |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 45,056 | 44,484
A&D |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 70,244 | 66,616
A&D | Point in time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 28,558 | 26,946
A&D | Over time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 41,686 | 39,670
A&D | United States [Member] |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 60,687 | 57,538
A&D | International |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 9,557 | 9,078
A&D | Commercial |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 28,075 | 27,604
A&D | Government [Member] |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 42,169 | 39,012
USG |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 63,485 | 54,540
USG | Point in time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 50,835 | 42,367
USG | Over time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 12,650 | 12,173
USG | United States [Member] |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 38,741 | 37,045
USG | International |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 24,744 | 17,495
USG | Commercial |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 62,842 | 53,864
USG | Government [Member] |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 643 | 676
Test |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 43,281 | 41,518
Test | Point in time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 12,821 | 8,868
Test | Over time |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 30,460 | 32,650
Test | United States [Member] |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 22,975 | 23,266
Test | International |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 20,306 | 18,252
Test | Commercial |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | 41,037 | 36,722
Test | Government [Member] |  |
Disaggregation of revenues |  |
Revenue from contract with customer excluding assessed tax | $ 2,244 | $ 4,796

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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