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Leases (Tables) | 6 Months Ended
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Mar. 31, 2024
Leases |
Schedule of components of lease expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ |  | March 31, 2024 |  | March 31, 2023 |  | March 31, 2024 |  | March 31, 2023
​ | ​ | (in millions)
Operating lease cost | ​ | $ | 37.7 | ​ | $ | 41.6 | ​ | $ | 75.1 | ​ | $ | 83.1
Finance lease cost: | ​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of right-of-use assets | ​ |  | 7.3 | ​ | ​ | 5.7 | ​ | ​ | 14.1 | ​ | ​ | 10.8
Interest on lease liabilities | ​ |  | 0.7 | ​ | ​ | 0.6 | ​ | ​ | 1.5 | ​ | ​ | 1.2
Variable lease cost | ​ |  | 8.6 | ​ | ​ | 8.6 | ​ | ​ | 17.5 | ​ | ​ | 16.5
Total lease cost | ​ | $ | 54.3 | ​ | $ | 56.5 | ​ | $ | 108.2 | ​ | $ | 111.6
Schedule of additional balance sheet information related to leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | As of | ​ | As of
(in millions except as noted) |  | Balance Sheet Classification |  | March 31, 2024 |  | September 30, 2023
Assets: |  |  |  | ​ | ​ | ​ | ​ |
Operating lease assets |  | Operating lease right-of-use assets | ​ | $ | 422.9 | ​ | $ | 447.0
Finance lease assets |  | Property and equipment – net | ​ | ​ | 69.1 | ​ | ​ | 64.8
Total lease assets |  |  | ​ | $ | 492.0 | ​ | $ | 511.8
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities: |  |  | ​ | ​ | ​ | ​ | ​ | ​
Current: |  |  | ​ | ​ | ​ | ​ | ​ | ​
Operating lease liabilities |  | Accrued expenses and other current liabilities | ​ | $ | 142.0 | ​ | $ | 139.8
Finance lease liabilities |  | Current portion of long-term debt | ​ | ​ | 27.3 | ​ | ​ | 25.0
Total current lease liabilities |  |  | ​ | ​ | 169.3 | ​ | ​ | 164.8
Non-current: |  |  | ​ | ​ | ​ | ​ | ​ | ​
Operating lease liabilities |  | Operating lease liabilities, noncurrent | ​ | ​ | 507.5 | ​ | ​ | 548.9
Finance lease liabilities |  | Long-term debt | ​ | ​ | 41.3 | ​ | ​ | 39.8
Total non-current lease liabilities |  |  | ​ | $ | 548.8 | ​ | $ | 588.7
​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​ | As of | ​
​ |  | March 31, 2024 |  | September 30, 2023 | ​
Weighted average remaining lease term (in years): | ​ | ​ |  | ​ |
Operating leases |  | 6.2 | ​ | 6.4 | ​
Finance leases |  | 2.8 | ​ | 2.9 | ​
Weighted average discount rates: |  | ​ | ​ | ​ | ​
Operating leases |  | 5.0 | % | 4.3 | %
Finance leases |  | 4.3 | % | 4.1 | %
Schedule of additional cash flow information related to leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended
​ | ​ | March 31, | ​ | March 31,
​ |  | 2024 |  | 2023
​ | ​ | (in millions)
Cash paid for amounts included in the measurement of lease liabilities: | ​ | ​ | ​ | ​ | ​ |
Operating cash flows from operating leases | ​ | $ | 92.7 | ​ | $ | 94.8
Operating cash flows from finance leases | ​ | ​ | 1.6 | ​ | ​ | 1.2
Financing cash flows from finance leases | ​ | ​ | 15.1 | ​ | ​ | 11.3
Right-of-use assets obtained in exchange for new operating leases | ​ | ​ | 38.0 | ​ | ​ | 66.4
Right-of-use assets obtained in exchange for new finance leases | ​ | ​ | 17.9 | ​ | ​ | 19.6
Schedule of total remaining lease payments under the Company's operating and finance leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Operating Leases |  | Finance Leases
Fiscal Year | ​ | (in millions)
2024 (six months remaining) | ​ | $ | 89.3 | ​ | $ | 15.5
2025 | ​ |  | 152.4 | ​ | ​ | 26.6
2026 | ​ |  | 121.3 | ​ | ​ | 19.4
2027 | ​ |  | 92.2 | ​ | ​ | 10.4
2028 | ​ | ​ | 79.9 | ​ | ​ | 1.3
Thereafter | ​ |  | 223.5 | ​ | ​ | —
Total lease payments | ​ | $ | 758.6 | ​ | $ | 73.2
Less: Amounts representing interest | ​ | $ | (109.1) | ​ | $ | (4.6)
Total lease liabilities | ​ | $ | 649.5 | ​ | $ | 68.6
​

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