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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, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 392,405 | $ 379,294 | $ 391,400 | $ 374,177 | $ 407,444 | $ 411,621 | $ 414,061 | $ 369,454 | $ 1,537,276 | $ 1,602,580 | $ 1,515,608
Long-lived assets | 1,484,899 |  |  |  | 1,645,579 |  |  |  | 1,484,899 | 1,645,579 | 1,557,709
North America |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 1,038,268 | 1,066,367 | 1,043,924
Long-lived assets | 1,047,505 |  |  |  | 1,182,250 |  |  |  | 1,047,505 | 1,182,250 | 1,069,862
Central and South America |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 5,853 | 6,171 | 6,518
Long-lived assets | 15,585 |  |  |  | 16,535 |  |  |  | 15,585 | 16,535 | 13,882
Europe |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 426,253 | 456,078 | 396,242
Long-lived assets | 342,802 |  |  |  | 365,455 |  |  |  | 342,802 | 365,455 | 382,940
Australia |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 20,885 | 23,276 | 21,507
Long-lived assets | 21,278 |  |  |  | 23,037 |  |  |  | 21,278 | 23,037 | 24,887
Asia |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 46,017 | 50,688 | 47,417
Long-lived assets | $ 57,729 |  |  |  | $ 58,302 |  |  |  | $ 57,729 | $ 58,302 | $ 66,138

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