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Share - Based Compensation Plans (Tables) | 12 Months Ended
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Sep. 27, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Effects of Stock-Based Compensation Expense Related to Stock-Based Awards to Employees and Nonemployees | The following table shows a summary of share-based compensation expense included in the Consolidated Statements of Operations during the periods presented (in thousands):
| Fiscal Years
| 2019 |  | 2018 |  | 2017
Cost of revenue | $ | 2,936 |  |  | $ | 3,869 |  |  | $ | 3,189 |
Research and development | 8,551 |  |  | 13,448 |  |  | 10,565 |
Selling, general and administrative | 12,305 |  |  | 14,620 |  |  | 22,581 |
Total | $ | 23,792 |  |  | $ | 31,937 |  |  | $ | 36,335 |
Summary of Stock Option Activity | A summary of stock option activity for fiscal year 2019 is as follows (in thousands, except per share amounts and contractual term):
| Number of Shares |  | Weighted-Average Exercise Price per Share |  | Weighted-Average Remaining Contractual Term (in Years) |  | Aggregate Intrinsic Value
Options outstanding - September 28, 2018 | 1,408 |  |  | $ | 32.05 |  |  |  |  |
Granted | 585 |  |  | 15.44 |  |  |  |  |
Exercised | (119 | ) |  | 13.48 |  |  |  |  |
Forfeited, canceled or expired | (1,497 | ) |  | 31.68 |  |  |  |  |
Options outstanding - September 27, 2019 | 376 |  |  | $ | 13.58 |  |  | 7.03 |  | $ | 3,046 |
Options vested and expected to vest - September 27, 2019 | 376 |  |  | $ | 13.58 |  |  | 7.03 |  | $ | 3,046 |
Options exercisable - September 27, 2019 | 91 |  |  | $ | 9.82 |  |  | 2.48 |  | $ | 1,081 |
Weighted Average Assumptions used for Calculating Fair Value of Stock Options Granted | The weighted average Monte Carlo input assumptions used for calculating the fair value of these market-based stock options are as follows:
| Fiscal Years
| 2019 |  | 2018 |  | 2017
Risk-free interest rate | 2.8 | % |  | 2.3 | % |  | 1.9 | %
Expected term (years) | 3.9 |  |  | 3.4 |  |  | 7.0 |
Expected volatility | 51.9 | % |  | 45.8 | % |  | 32.3 | %
Target price | $53.87 |  | $98.99 |  | $67.39
The assumptions used to value the awards are as follows:
| Fiscal Year
| 2019
Risk free interest rate | 1.9 | %
Years to maturity | 3.33 |
Expected volatility rate | 61.5 | %
Dividend yield | — |
Summary of Restricted Stock Awards and Unit Activity | A summary of restricted stock awards and units activity for fiscal year 2019 is as follows (in thousands):
| Number of Shares |  | Weighted-Average Grant Date Fair Value |  | Aggregate Intrinsic Value
Issued and unvested - September 28, 2018 | 1,872 |  |  | $ | 34.15 |  |  | $ | 38,452 |
Granted | 2,977 |  |  | 18.18 |  |  |
Vested | (673 | ) |  | 34.87 |  |  |
Forfeited, canceled or expired | (1,563 | ) |  | 24.06 |  |  |
Issued and unvested - September 27, 2019 | 2,613 |  |  | 21.81 |  |  | $ | 56,649 |

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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 for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -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 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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