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REPORTABLE SEGMENTS - Disaggregation of revenue by segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |
Revenue | $ 2,270,626 | $ 2,066,546 | $ 1,874,248
Revenue from Defense Electronics | 271,060 | 340,976 | 335,041
Subtotal | 2,541,686 | 2,407,522 | 2,209,289
Discontinued Operations, Held-for-sale | Defense Electronics |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Defense Electronics | 271,060 | 340,976 | 335,041
Consumer and Professional Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | 1,229,518 | 1,139,233 | 1,000,608
Home and Building Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue | $ 1,041,108 | $ 927,313 | $ 873,640

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