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DEBT AND FINANCING ARRANGEMENTS - Narrative (Details) £ in Thousands, € in Millions |  | 12 Months Ended | 24 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 09, 2020 GBP (£) | Sep. 30, 2022 USD ($) | Feb. 28, 2022 USD ($) | Sep. 30, 2022 EUR (€) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 EUR (€) | Sep. 30, 2014 USD ($) | Sep. 30, 2014 GBP (£)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Other borrowings |  | $ 798,568,000 |  |  | $ 763,710,000 |  |  |
Contested letter of credit | £ | £ 10,450 |  |  |  |  |  |  |
Securitization facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available |  |  | $ 115,000,000 |  |  |  |  |
Outstanding borrowings |  |  |  |  | $ 95,990,000 |  |  |
Interest rate (as a percent) |  |  |  |  | 0.83% | 0.83% |  |
Securitization facility | LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Variable interest rate (as a percent) |  |  | 0.75% |  |  |  |  |
Securitization facility | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  | 0.25% |  |  |  |  |
Securitization facility | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  | 0.35% |  |  |  |  |
Receivables Purchase Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Facility limit |  | 125,000,000 |  |  |  |  |  |
Gross receivables sold |  | 424,789,000 |  |  |  |  |  |
Cash collections |  | 328,199,000 |  |  |  |  |  |
Receivables sold to purchasers |  | 96,590,000 |  |  |  |  |  |
Unsold receivables |  | $ 44,262,000 |  |  |  |  |  |
Line of Credit | March 2020 Debt Amendment |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) |  | 3.13% |  | 3.13% | 2.03% | 2.03% |  |
2025 Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued |  | $ 299,625,000 |  |  |  |  |  |
Fixed interest rate (as a percent) |  | 5.25% |  | 5.25% |  |  |  |
Debt issuance costs |  | $ 1,664,000 |  |  | $ 2,204,000 |  |  |
Other borrowings |  | $ 297,961,000 |  |  | $ 297,796,000 |  |  |
Other borrowings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) |  | 1.85% |  | 1.85% | 2.19% | 2.19% |  |
Other borrowings |  | $ 13,434,000 |  |  | $ 10,150,000 |  |  |
Revolving Credit Facility | March 2020 Debt Amendment |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing amount drawn In foreign currency |  | 350,000,000 |  |  |  |  |  |
Unamortized costs |  | 1,522,000 |  |  | 2,182,000 |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Other borrowings |  | 480,107,000 |  |  | 350,597,000 |  |  |
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available |  | 750,000,000 |  |  |  |  |  |
Outstanding borrowings |  | $ 472,057,000 |  |  | 349,780,000 |  |  |
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment | LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on borrowings (as a percent) |  | 1.25% |  | 1.25% |  |  |  |
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual commitment fee range on unused portion |  | 0.15% |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment | Minimum | LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on borrowings, based on leverage ratio |  | 0.75% |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Annual commitment fee range on unused portion |  | 0.30% |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment | Maximum | LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate on borrowings, based on leverage ratio |  | 2.00% |  |  |  |  |  |
Standby Letters of Credit | Line of Credit | March 2020 Debt Amendment |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available |  | $ 55,000,000 |  |  |  |  |  |
Foreign Line of Credit | Credit Facility With European Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available |  | 24,499,000 |  | € 25.0 |  |  |  |
Outstanding borrowings |  | $ 8,050,000 |  | € 8.2 | $ 817,000 | € 0.7 |  |
Weighted-average interest rate on outstanding borrowings (as a percent) |  | 2.25% |  | 2.25% | 2.25% | 2.25% |  |
Foreign Line of Credit | Bank Guarantees | Credit Facility With European Bank |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available |  | $ 7,840,000 |  | € 8.0 |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available |  |  |  |  |  |  | $ 9,544,000 | £ 8,570

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