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SEGMENT INFORMATION - Information about the Company's Operations by Geographic Area (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | $ 1,671,030 | $ 1,498,306 | $ 1,537,276
Long-lived assets | 1,259,036 | 1,335,674 | 1,484,899
North America |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 1,141,396 | 1,037,705 | 1,038,268
Long-lived assets | 890,545 | 957,393 | 1,047,505
Central and South America |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 5,036 | 6,304 | 5,853
Long-lived assets | 14,226 | 14,063 | 15,585
Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 446,274 | 387,831 | 426,253
Long-lived assets | 277,655 | 286,990 | 342,802
Australia |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 23,568 | 21,079 | 20,885
Long-lived assets | 21,012 | 21,746 | 21,278
Asia |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 54,756 | 45,387 | 46,017
Long-lived assets | $ 55,598 | $ 55,482 | $ 57,729

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