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REVENUES - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | $ 219,066 | $ 181,394 | $ 601,004 | $ 509,962
Point in time |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 104,721 | 82,428 | 298,645 | 236,454
Over time |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 114,345 | 98,966 | 302,359 | 273,508
United States [Member] |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 156,020 | 135,531 | 423,578 | 376,078
International |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 63,046 | 45,863 | 177,426 | 133,884
Commercial |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 158,977 | 123,506 | 439,629 | 352,950
Government [Member] |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 60,089 | 57,888 | 161,375 | 157,012
Aerospace & Defense |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 92,606 | 85,576 | 247,671 | 234,720
Aerospace & Defense | Point in time |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 35,238 | 37,513 | 99,464 | 103,492
Aerospace & Defense | Over time |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 57,368 | 48,063 | 148,207 | 131,228
Aerospace & Defense | United States [Member] |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 79,536 | 75,701 | 212,849 | 205,527
Aerospace & Defense | International |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 13,070 | 9,875 | 34,822 | 29,193
Aerospace & Defense | Commercial |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 38,918 | 34,708 | 100,407 | 95,712
Aerospace & Defense | Government [Member] |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 53,688 | 50,868 | 147,264 | 139,008
USG |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 67,201 | 47,704 | 194,877 | 141,799
USG | Point in time |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 53,656 | 35,242 | 155,693 | 105,173
USG | Over time |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 13,545 | 12,462 | 39,184 | 36,626
USG | United States [Member] |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 41,822 | 32,111 | 122,021 | 96,601
USG | International |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 25,379 | 15,593 | 72,856 | 45,198
USG | Commercial |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 65,610 | 46,735 | 191,832 | 139,149
USG | Government [Member] |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 1,591 | 969 | 3,045 | 2,650
Test |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 59,259 | 48,114 | 158,456 | 133,443
Test | Point in time |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 15,827 | 9,673 | 43,488 | 27,789
Test | Over time |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 43,432 | 38,441 | 114,968 | 105,654
Test | United States [Member] |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 34,662 | 27,719 | 88,708 | 73,950
Test | International |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 24,597 | 20,395 | 69,748 | 59,493
Test | Commercial |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | 54,449 | 42,063 | 147,390 | 118,089
Test | Government [Member] |  |  |  |
Disaggregation of revenues |  |  |  |
Revenue from contract with customer excluding assessed tax | $ 4,810 | $ 6,051 | $ 11,066 | $ 15,354

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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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126920106&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126901519&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 https://asc.fasb.org/extlink&oid=126920106&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 https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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