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Stock-based compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 29, 2019 | Sep. 29, 2018
Number of Units |  |
Outstanding, beginning balance (in shares) | 0 |
Forfeited (in shares) | 7,369,802 |
Exercised (in shares) | (435,978) |
Granted (in shares) | (225,899) |
Outstanding, ending balance (in shares) | 6,707,925 |
Weighted Average Grant Date Fair Value |  |
Outstanding, beginning balance (in usd per share) | $ 0.00 |
Outstanding, ending balance (in usd per share) | $ 11.31 |
Additional Information |  |
Aggregate Intrinsic Value | $ 76,068 | $ 0
Options vested and expected to vest (in shares) | 5,118,685 |
Options vested and expected to vest - Weighted Average Exercise Price (in USD per share) | $ 11.32 |
Options vested and expected to vest - Weighted Average Intrinsic Value | $ 58,046 |

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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 The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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