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SEGMENT INFORMATION - Information about the Company's Operations by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 399,140 | $ 359,422 | $ 374,800 | $ 364,944 | $ 392,405 | $ 379,294 | $ 391,400 | $ 374,177 | $ 1,498,306 | $ 1,537,276 | $ 1,602,580
Long-lived assets | 1,335,674 |  |  |  | 1,484,899 |  |  |  | 1,335,674 | 1,484,899 | 1,645,579
North America |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,037,705 | 1,038,268 | 1,066,367
Long-lived assets | 957,393 |  |  |  | 1,047,505 |  |  |  | 957,393 | 1,047,505 | 1,182,250
Central and South America |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 6,304 | 5,853 | 6,171
Long-lived assets | 14,063 |  |  |  | 15,585 |  |  |  | 14,063 | 15,585 | 16,535
Europe |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 387,831 | 426,253 | 456,078
Long-lived assets | 286,990 |  |  |  | 342,802 |  |  |  | 286,990 | 342,802 | 365,455
Australia |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 21,079 | 20,885 | 23,276
Long-lived assets | 21,746 |  |  |  | 21,278 |  |  |  | 21,746 | 21,278 | 23,037
Asia |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 45,387 | 46,017 | 50,688
Long-lived assets | $ 55,482 |  |  |  | $ 57,729 |  |  |  | $ 55,482 | $ 57,729 | $ 58,302

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