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Stock-based compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 28, 2020 | Sep. 28, 2019
Number of Units |  |
Outstanding, beginning balance (in shares) | 6,716,786 |
Forfeited (in shares) | 1,572,617 |
Exercised (in shares) | (923,636) |
Granted (in shares) | (382,429) |
Outstanding, ending balance (in shares) | 6,983,338 |
Weighted Average Grant Date Fair Value |  |
Outstanding, beginning balance (in usd per share) | $ 11.40 |
Outstanding, ending balance (in usd per share) | $ 11.99 |
Additional Information |  |
Aggregate Intrinsic Value | $ 60,196 | $ 90,744
Options vested and expected to vest (in shares) | 5,648,433 |
Options vested and expected to vest - Weighted Average Exercise Price (in USD per share) | $ 12.00 |
Options vested and expected to vest - Weighted Average Intrinsic Value | $ 48,689 |

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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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