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Stock-based compensation (Tables) | 12 Months Ended
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Sep. 29, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of stock option activity | Stock option activity was as follows:
| Number of Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Weighted Average Intrinsic Value
|  |  |  |  | (in years) |  | (in thousands)
Outstanding at September 30, 2017 | 45,817,252 |  |  | $ | 9.20 |  |  | 6.9 |  | $ | 199,663 |
Granted | 9,316,926 |  |  | 15.12 |  |  |  |  |  |
Exercised | (2,657,436 | ) |  | 3.52 |  |  |  |  |  |
Forfeited | (3,971,280 | ) |  | 13.14 |  |  |  |  |
Expired | (1,280 | ) |  | 15.11 |  |  |  |  |  |
Outstanding at September 29, 2018 | 48,504,182 |  |  | $ | 10.33 |  |  | 6.6 |  | $ | 276,959 |
At September 29, 2018 |  |  |  |  |  |  |
Options exercisable | 31,194,219 |  |  | $ | 8.13 |  |  | 5.4 |  | $ | 246,847 |
Options vested and expected to vest | 45,662,090 |  |  | $ | 10.07 |  |  | 6.5 |  | $ | 272,699 |
Schedule of fair value of options | The fair value of options at the date of grant was estimated using the Black-Scholes option pricing model with the following weighted-average assumptions:
| 2018 |  | 2017 |  | 2016
Expected term (years) | 6.25 |  |  | 6.25 |  |  | 6.25 |
Risk-free interest rate | 2.73 | % |  | 1.95 | % |  | 1.29 | %
Expected volatility | 30.19 | % |  | 32.40 | % |  | 36.64 | %
Expected dividend yield | — | % |  | — | % |  | — | %
Schedule of stock-based compensation expense | Total stock-based compensation expense by function category was as follows:
| 2018 |  | 2017 |  | 2016
(In thousands) |  |  |  |  |
Cost of revenue | $ | 198 |  |  | $ | 240 |  |  | $ | 211 |
Research and development | 13,960 |  |  | 13,605 |  |  | 8,260 |
Sales and marketing | 15,885 |  |  | 15,086 |  |  | 11,742 |
General and administrative | 8,602 |  |  | 7,619 |  |  | 5,750 |
Total stock-based compensation expense | $ | 38,645 |  |  | $ | 36,550 |  |  | $ | 25,963 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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