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v3.20.2

Summary of significant accounting policies - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Jun. 27, 2020 | Sep. 29, 2019 | Sep. 28, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounting standards update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |
Operating lease right-of-use assets | $ 43,325 |  |
Operating lease liabilities | 64,643 |  |
Assets | 644,628 |  | $ 761,605
Liabilities | $ 383,429 |  | $ 480,677
Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease right-of-use assets |  | $ 63,700 |
Operating lease liabilities |  | 73,700 |
Assets |  | 62,500 |
Liabilities |  | $ 62,500 |

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