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BUSINESS SEGMENTS - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 632,061 | $ 574,970 | $ 1,746,849 | $ 1,635,125
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 498,060 | 449,816 | 1,376,854 | 1,282,423
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 37,984 | 34,081 | 85,219 | 81,136
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 28,972 | 28,968 | 90,171 | 90,830
Australia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 48,626 | 36,830 | 142,681 | 124,656
All other countries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 18,419 | 25,275 | 51,924 | 56,080
Consumer and Professional Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 328,929 | 273,710 | 844,917 | 777,916
Consumer and Professional Products | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 232,544 | 193,948 | 584,114 | 541,309
Consumer and Professional Products | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 29,267 | 25,663 | 60,609 | 53,871
Consumer and Professional Products | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 18,231 | 16,246 | 53,527 | 54,456
Consumer and Professional Products | Australia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 47,614 | 35,829 | 140,874 | 121,617
Consumer and Professional Products | All other countries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,273 | 2,024 | 5,793 | 6,663
Consumer and Professional Products | Residential repair and remodel |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 50,709 | 35,416 | 126,304 | 101,015
Consumer and Professional Products | Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 177,271 | 148,596 | 441,795 | 424,537
Consumer and Professional Products | Residential new construction |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 14,487 | 15,345 | 44,344 | 43,162
Consumer and Professional Products | Industrial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 9,303 | 12,880 | 30,461 | 34,054
Consumer and Professional Products | International excluding North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 77,159 | 61,473 | 202,013 | 175,148
Home and Building Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 219,164 | 221,521 | 670,374 | 631,615
Home and Building Products | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 209,222 | 206,489 | 635,232 | 592,261
Home and Building Products | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 81 | 31 | 109 | 77
Home and Building Products | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 7,729 | 9,867 | 26,849 | 27,832
Home and Building Products | Australia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 163 | 0 | 613
Home and Building Products | All other countries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 2,132 | 4,971 | 8,184 | 10,832
Home and Building Products | Residential repair and remodel |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 109,876 | 112,730 | 332,681 | 316,368
Home and Building Products | Commercial construction |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 84,521 | 83,382 | 262,708 | 243,939
Home and Building Products | Residential new construction |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 24,767 | 25,409 | 74,985 | 71,308
Defense Electronics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 83,968 | 79,739 | 231,558 | 225,594
Defense Electronics | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 56,294 | 49,379 | 157,508 | 148,853
Defense Electronics | Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8,636 | 8,387 | 24,501 | 27,188
Defense Electronics | Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 3,012 | 2,855 | 9,795 | 8,542
Defense Electronics | Australia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,012 | 838 | 1,807 | 2,426
Defense Electronics | All other countries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 15,014 | 18,280 | 37,947 | 38,585
Defense Electronics | U.S. Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 54,802 | 46,579 | 151,126 | 138,515
Defense Electronics | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 24,779 | 30,120 | 68,333 | 75,348
Defense Electronics | Commercial |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 4,387 | $ 3,040 | $ 12,099 | $ 11,731

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