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Stockholders' equity - Textual information (Details) | Aug. 06, 2018 $ / shares shares | Sep. 28, 2019 $ / shares shares | Sep. 03, 2019 USD ($) | Sep. 29, 2018 $ / shares shares
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Equity [Abstract] |  |  |  |
Preferred stock automatically converted into common stock (in shares) | 32,482,590 |  |  |
Convertible preferred stock, conversion ratio | 1 |  |  |
Common stock, authorized (in shares) | 500,000,000 | 500,000,000 |  | 151,458,824
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 |  | $ 0.001
Preferred stock, authorized (in shares) | 10,000,000 |  |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.001 |  |  |
Stock repurchase program, authorized value | $ |  |  | $ 50,000,000.0 |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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