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Business and summary of significant accounting policies (Tables) | 12 Months Ended
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Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Adoption of Topic 842 | Changes to our opening balance sheet are summarized below. There was no cumulative impact to our retained earnings and the changes did not cause any material changes in our statements of operations or our statements of cash flows. The adoption of Topic 842 does not affect our compliance with our existing contracts, including our corporate credit facility.
(in thousands) |  | Balance at September 30, 2019 |  | Adjustments due to adoption of new standard |  | Opening balance at October 1, 2019
Assets |  |  |  |  |  |
Prepaid expenses and other current assets |  | $ | 62,481 |  |  | $ | (6,131) |  |  | $ | 56,350 |
Operating lease right-of-use assets |  | — |  |  | 206,314 |  |  | 206,314 |
Liabilities and shareholders' equity |  |  |  |  |  |
Accounts payable and accrued expenses |  | 177,786 |  |  | (5,250) |  |  | 172,536 |
Operating lease liabilities, current portion |  | — |  |  | 88,276 |  |  | 88,276 |
Other current liabilities |  | 12,709 |  |  | (648) |  |  | 12,061 |
Operating lease liabilities, less current portion |  | — |  |  | 126,197 |  |  | 126,197 |
Other long-term liabilities |  | 20,082 |  |  | (8,392) |  |  | 11,690 |

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