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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, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | $ 1,497,689 | $ 1,795,737 | $ 1,880,896
Long-lived assets | 818,094 | 1,102,648 | 1,128,913
North America |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 1,070,084 | 1,182,523 | 1,219,238
Long-lived assets | 692,024 | 799,545 | 806,182
Central and South America |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 3,089 | 5,456 | 5,260
Long-lived assets | 2,229 | 10,040 | 11,690
Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 357,077 | 522,196 | 572,736
Long-lived assets | 108,878 | 238,214 | 255,748
Australia |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 17,451 | 19,514 | 19,913
Long-lived assets | 5,415 | 14,412 | 14,099
Asia |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Sales | 49,988 | 66,048 | 63,749
Long-lived assets | $ 9,548 | $ 40,437 | $ 41,194

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