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DEBT AND FINANCING ARRANGEMENTS - Narrative (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 11, 2025 shares | Sep. 30, 2025 USD ($) shares | Sep. 30, 2024 USD ($) | Sep. 30, 2025 EUR (€) shares | Sep. 30, 2024 EUR (€)
Line of Credit Facility [Line Items] |  |  |  |  |
Supplier finance program, obligation, current |  | $ 6,136,000 | $ 3,014,000 |  |
Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration] |  | Trade accounts payable | Trade accounts payable | Trade accounts payable | Trade accounts payable
Other borrowings |  | $ 710,832,000 | $ 776,467,000 |  |
Class A common stock |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Shares issued with shelf registration (in shares) | shares | 1,250,000 |  |  |  |
Class A common stock | ATM Program |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Shares issued with shelf registration (in shares) | shares | 3,000,000 |  |  |  |
Shares remaining for sale | shares |  | 1,250,000 |  | 1,250,000 |
2027 Senior Secured Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt issuance costs |  | $ 3,890,000 | 5,249,000 |  |
Other borrowings |  | $ 296,110,000 | $ 294,751,000 |  |
Other borrowings |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) |  | 2.40% | 2.66% | 2.40% | 2.66%
Other borrowings |  | $ 7,151,000 | $ 15,602,000 |  |
Senior Notes 2027 | 2027 Senior Notes |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt issued amount |  | $ 300,000,000 |  |  |
Fixed interest rate (as a percent) |  | 8.625% |  | 8.625% |
Receivables Purchase Agreement |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Facility limit |  | $ 75,000,000 |  |  |
Receivables sold to purchasers |  | 65,600,000 | 96,300,000 |  |
Unsold receivables |  | 63,720,000 | 58,183,000 |  |
Principal amount of receivables sold |  | 45,813,000 | 70,236,000 |  |
Factored accounts receivable, outstanding |  |  | 15,665,000 |  |
Revolving credit facilities | March 2020 Debt Amendment |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum amount of borrowings available |  | 750,000,000 |  |  |
Maximum borrowing amount drawn In foreign currency |  | $ 350,000,000 |  |  |
Rate spread adjustment (as a percent) |  | 0.10% |  |  |
Interest rate during period (as a percent) |  | 1.25% |  |  |
Unamortized costs |  | $ 3,918,000 | 4,961,000 |  |
Revolving credit facilities | March 2020 Debt Amendment | Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Variable interest rate (as a percent) |  | 1.00% |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  | 0.15% |  |  |
Revolving credit facilities | March 2020 Debt Amendment | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Variable interest rate (as a percent) |  | 2.00% |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  | 0.30% |  |  |
Domestic Revolving Credit Facility | March 2020 Debt Amendment |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum available for issuance of trade and standby letters of credit |  | $ 75,000,000 |  |  |
Outstanding borrowings |  | $ 384,233,000 | $ 410,527,000 |  |
Weighted-average interest rate on outstanding borrowings (as a percent) |  | 3.99% | 4.59% | 3.99% | 4.59%
Foreign Line of Credit | Foreign Exchange Contract |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Notional amount |  |  | $ 33,485,000 | € 0 | € 30,000,000.0
Foreign Line of Credit | Credit Facility With European Bank |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum amount of borrowings available |  | $ 7,043,000 |  | 6,000,000.0 |
Outstanding borrowings |  | $ 774,000 |  | € 659,000 | € 0
Weighted-average interest rate on outstanding borrowings (as a percent) |  | 4.16% |  | 4.16% |
Foreign Line of Credit | Bank Guarantees | Credit Facility With European Bank |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum amount of borrowings available |  | $ 16,433,000 |  | € 14,000,000.0 |

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