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Stock-based compensation - Additional Information (Details) - USD ($) $ in Millions |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 28, 2019 | Sep. 28, 2019 | Mar. 28, 2020 | Sep. 28, 2019
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period |  |  | 48 months |
Cliff vesting period |  |  | 1 year |
Unrecognized stock-based compensation expense |  | $ 43.9 | $ 29.9 | $ 43.9
Unrecognized stock-based compensation expense, period of recognition |  |  | 1 year 8 months 12 days | 2 years
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cliff vesting period |  |  | 4 years |
Unrecognized stock-based compensation expense |  | $ 55.6 | $ 62.6 | $ 55.6
Unrecognized stock-based compensation expense, period of recognition | 3 years 1 month 6 days | 3 years 4 months 24 days |  |
2003 Stock Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercisable period |  |  | 10 years |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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