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REVENUES - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of revenues |  |  |  |
Net sales | $ 181,394 | $ 172,665 | $ 509,962 | $ 524,885
Point in time |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 82,428 | 73,364 | 236,454 | 245,106
Over time |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 98,966 | 99,301 | 273,508 | 279,779
United States |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 135,531 | 119,416 | 376,078 | 379,194
International |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 45,863 | 53,249 | 133,884 | 145,691
Commercial |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 123,506 | 115,962 | 352,950 | 374,459
U.S. Government |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 57,888 | 56,703 | 157,012 | 150,426
Aerospace & Defense |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 85,576 | 84,072 | 234,720 | 256,707
Aerospace & Defense | Point in time |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 37,513 | 36,461 | 103,492 | 118,660
Aerospace & Defense | Over time |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 48,063 | 47,611 | 131,228 | 138,047
Aerospace & Defense | United States |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 75,701 | 73,476 | 205,527 | 219,640
Aerospace & Defense | International |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 9,875 | 10,596 | 29,193 | 37,067
Aerospace & Defense | Commercial |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 34,708 | 37,485 | 95,712 | 130,817
Aerospace & Defense | U.S. Government |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 50,868 | 46,587 | 139,008 | 125,890
USG |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 47,704 | 42,577 | 141,799 | 139,179
USG | Point in time |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 35,242 | 27,765 | 105,173 | 100,289
USG | Over time |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 12,462 | 14,812 | 36,626 | 38,890
USG | United States |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 32,111 | 26,499 | 96,601 | 90,155
USG | International |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 15,593 | 16,078 | 45,198 | 49,024
USG | Commercial |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 46,735 | 39,740 | 139,149 | 135,711
USG | U.S. Government |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 969 | 2,837 | 2,650 | 3,468
Test |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 48,114 | 46,016 | 133,443 | 128,999
Test | Point in time |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 9,673 | 9,138 | 27,789 | 26,157
Test | Over time |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 38,441 | 36,878 | 105,654 | 102,842
Test | United States |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 27,719 | 19,441 | 73,950 | 69,399
Test | International |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 20,395 | 26,575 | 59,493 | 59,600
Test | Commercial |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | 42,063 | 38,737 | 118,089 | 107,931
Test | U.S. Government |  |  |  |
Disaggregation of revenues |  |  |  |
Net sales | $ 6,051 | $ 7,279 | $ 15,354 | $ 21,068

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