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v3.23.2

Borrowings - Schedule of Long-term Debt (Details) £ in Thousands, $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 16, 2023 | Jun. 30, 2023 USD ($) | Jun. 30, 2023 GBP (£) | Sep. 30, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 3,145,529 |  | $ 3,357,256
Less: Current Portion |  | (55,743) |  | (50,415)
Less: Deferred Financing Fees |  | (8,687) |  | (3,466)
2021 Term Loan Facility - USD Portion |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 200,000 |  | $ 200,000
2021 Term Loan Facility - USD Portion | SONIA Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 6.50% | 6.50% |
2021 Term Loan Facility - USD Portion | SONIA Rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.975% | 0.975% |
2021 Term Loan Facility - USD Portion | SONIA Rate | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.725% | 1.725% |
2021 Term Loan Facility - USD Portion | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 4.06%
2021 Term Loan Facility - USD Portion | Base Interest Rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.00% | 0.00% |
2021 Term Loan Facility - USD Portion | Base Interest Rate | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.625% | 0.625% |
2021 Term Loan Facility - GBP Portion |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 826,280 |  | $ 723,580
2021 Term Loan Facility - GBP Portion | SONIA Rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.908% | 0.908% |
2021 Term Loan Facility - GBP Portion | SONIA Rate | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.658% | 1.658% |
2021 Term Loan Facility - GBP Portion | Eurocurrency Interest Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 6.21% | 6.21% | 3.60%
2020 Term Loan Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 877,532 |  | $ 882,263
Quarterly principal payment, percent of aggregate borrowings |  | 1.25% |  |
Quarterly principal payment |  | $ 9,125 | £ 3,125 |
2020 Term Loan Facility | SONIA Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 6.45% | 6.45% |
2020 Term Loan Facility | SONIA Rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.975% | 0.975% |
2020 Term Loan Facility | SONIA Rate | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.725% | 1.725% |
2020 Term Loan Facility | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 4.49%
2020 Term Loan Facility | Base Interest Rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.00% | 0.00% |
2020 Term Loan Facility | Base Interest Rate | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.625% | 0.625% |
2020 Term Loan Facility | Eurocurrency Interest Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 6.21% | 6.21% | 3.60%
Bonds, Sustainability-Linked | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 500,000 |  | $ 0
Interest rate | 5.90% | 5.90% |  |
Interest rate, increase (decrease) over period | 0.35% |  |  |
Bonds, Sustainability-Linked | Senior Notes | First Step Up Date |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 6.025% | 6.025% |
Interest rate, increase (decrease) over period |  | 0.125% | 0.125% |
Interest rate payable period |  | 15 days | 15 days |
Bonds, Sustainability-Linked | Senior Notes | Second Step Up Date |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 6.15% | 6.15% |
Interest rate, increase (decrease) over period |  | 0.125% | 0.125% |
Interest rate payable period |  | 15 days | 15 days |
Senior Notes, Series A |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 0 |  | 190,000
Interest rate |  | 4.27% |  |
Senior Notes, Series B |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 0 |  | 180,000
Interest rate |  | 4.42% |  |
Senior Notes, Series C |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 0 |  | 130,000
Interest rate |  | 4.52% |  |
2020 Term Loan Facility, Denominated in GDP | SONIA Rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.908% | 0.908% |
2020 Term Loan Facility, Denominated in GDP | SONIA Rate | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.658% | 1.658% |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 806,147 |  | $ 1,105,294
Revolving Credit Facility | SONIA Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 6.49% | 6.49% |
Revolving Credit Facility | SONIA Rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.975% | 0.975% |
Revolving Credit Facility | SONIA Rate | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.725% | 1.725% |
Revolving Credit Facility | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 4.08%
Revolving Credit Facility | Base Interest Rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.00% | 0.00% |
Revolving Credit Facility | Base Interest Rate | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.625% | 0.625% |
Revolving Credit Facility | Eurocurrency Interest Rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.908% | 0.908% |
Revolving Credit Facility | Eurocurrency Interest Rate | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 1.658% | 1.658% |

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