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Income taxes - Valuation allowance (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Oct. 01, 2016 | Sep. 28, 2014
Valuation Allowance [Line Items] |  |  |  |
Beginning balance | $ 94,956 | $ 95,882 | $ 33,264 |
Increase (decrease) during the period | (22,576) | (926) | 19,535 |
Increase due to adoption of ASU 2016-09 |  |  |  | $ 43,400
Ending balance | 72,380 | 94,956 | 95,882 |
Accounting Standards Update 2016-09 |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Increase due to adoption of ASU 2016-09 | $ 0 | $ 0 | $ 43,083 |

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- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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- Details
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