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Share-based compensation - Restricted Stock Units Activity (Details) - RSUs - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Outstanding, beginning balance (in shares) | 0 |
Granted (in shares) | 7,915,980 |
Exercised (in shares) | (829,270) |
Forfeited (in shares) | (369,924) |
Expired (in shares) | 0 |
Outstanding, ending balance (in shares) | 6,716,786 |
Units expected to vest (in shares) | 5,207,691 |
Outstanding (in usd per share) | $ 11.4 | $ 0.0
Aggregate Intrinsic Value | $ 90,744 | $ 0
Vested and expected to vest - Weighted Average Exercise Price (in dollars per share) | $ 11.4 |
Vested and expected to vest - Weighted Average Intrinsic Value | $ 70,356 |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of shares under non-option equity instrument agreements for which rights to exercise lapsed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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