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ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Cost of Revenue |  | $ (990,096) | $ (1,266,030) | $ (1,303,224)
Other income (deductions), net |  | 3,651 | (6,800) | (2,559)
Income (loss) before income taxes |  | 16,209 | (69,657) | 40,910
Income tax (provision) benefit |  | (40,680) | 9,997 | (1,774)
Net (loss) income |  | (24,471) | (59,660) | 39,136
Interest expense |  | 62,895 | 50,534 | 44,648
SGK Brand Solutions |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Gain on sale of SGK Business |  | 55,139 | 0 | 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | SGK Brand Solutions |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Gain on sale of SGK Business | $ 55,139 |  |  |
Postretirement Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income (loss) before income taxes |  | 913 | 1,139 | (135)
Income tax (provision) benefit |  | (231) | (289) | 33
Net (loss) income |  | 682 | 850 | (102)
Prior service (cost) credit | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Cost of Revenue |  | 362 | 364 | 364
Actuarial gains (losses) | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (deductions), net |  | 551 | 775 | 772
Settlement losses | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other income (deductions), net |  | 0 | 0 | (1,271)
Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income (loss) before income taxes |  | 2,378 | 3,495 | 3,785
Income tax (provision) benefit |  | (600) | (884) | (959)
Net (loss) income |  | 1,778 | 2,611 | 2,826
Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swaps |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense |  | 1,302 | 2,679 | 2,626
Net investment hedge | Reclassification out of Accumulated Other Comprehensive Income | Cross-Currency Swaps |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest expense |  | 1,076 | 816 | 1,159
Accumulated Other Comprehensive Income, Other | Reclassification out of Accumulated Other Comprehensive Income | Disposal Group, Disposed of by Sale, Not Discontinued Operations | SGK Brand Solutions |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Gain on sale of SGK Business |  | (92,681) | 0 | 0
Accumulated Other Comprehensive Income, Other | Reclassification out of Accumulated Other Comprehensive Income | Discontinued Operations, Held-for-Sale |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other divestitures |  | $ (6,844) | $ 0 | $ 0

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