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LONG-TERM DEBT - Narrative (Details) £ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 09, 2020 GBP (£) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2021 EUR (€) | Sep. 30, 2020 EUR (€) | Sep. 30, 2014 GBP (£)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Other borrowings |  | $ 763,710,000 | $ 834,534,000 |  |  |  |
Currency translation adjustment gain (loss) |  | (5,370,000) | (4,377,000) |  |  |  |
Currency translation adjustment, tax |  | (1,743,000) | (1,420,000) |  |  |  |
Contested letter of credit | £ | £ 10,450 |  |  |  |  |  |
Designated as Hedging Instrument |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss included in AOCI expected to be recognized over the next 12 months |  | 1,428,000 |  |  |  |  |
Interest Rate Swaps | Cash Flow Hedging | Interest Expense |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Currency translation adjustment gain (loss) |  | (2,453,000) | (650,000) | $ 2,402,000 |  |  |
Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Net unrealized loss |  | 2,062,000 | 7,792,000 |  |  |  |
Net unrealized loss after tax |  | 1,558,000 | 5,884,000 |  |  |  |
Derivative, notional amount |  | 250,000,000 | 312,500,000 |  |  |  |
Currency Swap | Net Investment Hedging | Designated as Hedging Instrument |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Derivative, notional amount |  | $ 94,464,000 |  |  |  |  |
Derivative, term of contract |  | 7 years |  |  |  |  |
Net investment hedge, gain, after reclassification and tax |  | $ 22,000 |  |  |  |  |
Net investment hedge, gain, after reclassification, tax |  | (7,000) |  |  |  |  |
Currency Swap | Net Investment Hedging | Designated as Hedging Instrument | Interest Expense |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments and Tax |  | 63,000 |  |  |  |  |
Securitization facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available |  | 115,000,000 |  |  |  |  |
Outstanding borrowings |  | $ 95,990,000 | $ 67,700,000 |  |  |  |
Interest rate (as a percent) |  | 0.83% | 0.90% |  | 0.83% | 0.90% |
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% |  |  |  |  |
Line of Credit | March 2020 Debt Amendment |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) |  | 2.03% | 2.41% |  | 2.03% | 2.41% |
2025 Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issued |  | $ 300,000,000 |  |  |  |  |
Fixed interest rate (as a percent) |  | 5.25% |  |  | 5.25% |  |
Debt issuance costs |  | $ 2,204,000 | $ 2,744,000 |  |  |  |
Other borrowings |  | $ 297,796,000 | $ 297,256,000 |  |  |  |
Other borrowings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted-average interest rate on outstanding borrowings (as a percent) |  | 2.19% | 2.10% |  | 2.19% | 2.10% |
Other borrowings |  | $ 10,150,000 | $ 20,742,000 |  |  |  |
Revolving Credit Facility | March 2020 Debt Amendment |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing amount drawn In foreign currency |  | 350,000,000 |  |  |  |  |
Unamortized costs |  | 2,182,000 | 2,734,000 |  |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Other borrowings |  | 350,597,000 | 416,793,000 |  |  |  |
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available |  | 750,000,000 |  |  |  |  |
Outstanding borrowings |  | $ 349,780,000 | 257,439,000 |  |  |  |
Revolving Credit Facility | Line of Credit | March 2020 Debt Amendment | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate on borrowings (as a percent) |  | 1.00% |  |  | 1.00% |  |
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% |  |  |  |  |
Senior secured term loan | Line of Credit | March 2020 Debt Amendment |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available |  | $ 35,000,000 |  |  |  |  |
Standby Letters of Credit | Line of Credit | March 2020 Debt Amendment |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available |  | 35,000,000 |  |  |  |  |
Line of Credit | Euro Member Countries, Euro | March 2020 Debt Amendment |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Outstanding borrowings |  | 0 | 137,188,000 |  |  | € 117,000,000 |
Foreign Line of Credit | Credit Facility With European Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available |  | 28,976,000 |  |  | € 25,000,000 |  |
Outstanding borrowings |  | $ 817,000 | $ 22,166,000 |  | € 704,000 | € 18,900,000 |
Weighted-average interest rate on outstanding borrowings (as a percent) |  | 2.25% | 1.25% |  | 2.25% | 1.25% |
Foreign Line of Credit | Bank Guarantees | Credit Facility With European Bank |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available |  | $ 9,272,000 |  |  | € 8,000,000 |  |
Term Loan | March 2020 Debt Amendment |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Outstanding borrowings |  | 0 | $ 22,359,000 |  |  |  |
Letter of Credit | Other current assets |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum amount of borrowings available |  | $ 11,535,000 |  |  |  |  | £ 8,570

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