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Business and summary of significant accounting policies (Tables)
12 Months Ended
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, 2019Adjustments due to adoption of new standardOpening 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 expenses177,786 (5,250)172,536 
Operating lease liabilities, current portion— 88,276 88,276 
Other current liabilities12,709 (648)12,061 
Operating lease liabilities, less current portion— 126,197 126,197 
Other long-term liabilities20,082 (8,392)11,690