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Stockholders' Equity and Stock-Based Compensation (Tables) | 12 Months Ended
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Sep. 28, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation Expense in Consolidated Statement of Operations | The following presents stock-based compensation expense in the Company’s Consolidated Statements of Operations in fiscal 2019, 2018 and 2017:
|  | 2019 |  | 2018 |  | 2017
Cost of revenues |  | $ | 7.1 |  |  | $ | 8.3 |  |  | $ | 10.7 |
Research and development |  | 9.2 |  |  | 9.5 |  |  | 11.2 |
Selling and marketing |  | 10.2 |  |  | 10.3 |  |  | 11.9 |
General and administrative |  | 35.5 |  |  | 35.6 |  |  | 34.4 |
Restructuring |  | — |  |  | 1.3 |  |  | — |
|  | $ | 62.0 |  |  | $ | 65.0 |  |  | $ | 68.2 |
Information Pertaining to Stock Options Granted and Related Assumptions | Information pertaining to stock options granted during fiscal 2019, 2018 and 2017 and related assumptions are noted in the following table:
|  | Years ended
September 28, 2019 |  | September 29, 2018 |  | September 30, 2017
Options granted (in millions) |  | 1.0 |  |  | 1.7 |  |  | 1.0 |
Weighted-average exercise price |  | $ | 41.36 |  |  | $ | 40.76 |  |  | $ | 38.07 |
Weighted-average grant date fair value |  | $ | 13.54 |  |  | $ | 12.98 |  |  | $ | 12.33 |
Assumptions: |  |  |  |  |  |
Risk-free interest rates |  | 3.0 | % |  | 2.1 | % |  | 1.8 | %
Expected life (in years) |  | 4.8 |  |  | 4.7 |  |  | 4.7 |
Expected volatility |  | 34.3 | % |  | 35.3 | % |  | 36.6 | %
Dividend yield |  | — |  |  | — |  |  | — |
Stock Option Activity | The following table summarizes all stock option activity under the Company’s stock option plans for the year ended September 28, 2019:
|  | Number of Shares (in millions) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life (in Years) |  | Aggregate Intrinsic Value (in millions)
Options outstanding at September 29, 2018 |  | 6.0 |  |  | $ | 32.13 |  |  | 5.9 |  | $ | 53.3 |
Granted |  | 1.0 |  |  | 41.36 |  |  |  |  |
Canceled/ forfeited |  | (0.2 | ) |  | 36.04 |  |  |  |  |
Exercised |  | (1.3 | ) |  | 25.35 |  |  |  |  | 26.1 |
Options outstanding at September 28, 2019 |  | 5.5 |  |  | $ | 35.23 |  |  | 6.1 |  | $ | 78.4 |
Options exercisable at September 28, 2019 |  | 2.7 |  |  | $ | 30.58 |  |  | 4.2 |  | $ | 52.2 |
Options vested and expected to vest at September 28, 2019 (1) |  | 5.4 |  |  | $ | 35.20 |  |  | 6.1 |  | $ | 78.1 |
(1) This represents the number of vested stock options as of September 28, 2019 plus the unvested outstanding options at September 28, 2019 expected to vest in the future, adjusted for estimated forfeitures.
Restricted Stock Unit Activity | A summary of the Company’s RSU, PSU and MSU activity during the year ended September 28, 2019 is presented below:
Non-vested Shares |  | Number of Shares (in millions) |  | Weighted-Average Grant-Date Fair Value
Non-vested at September 29, 2018 |  | 2.7 |  |  | $ | 40.02 |
Granted |  | 1.1 |  |  | 42.25 |
Vested |  | (1.1 | ) |  | 37.28 |
Forfeited |  | (0.2 | ) |  | 41.23 |
Non-vested at September 28, 2019 |  | 2.5 |  |  | $ | 42.17 |
Black-Scholes Model Weighted Average Assumptions Used to Estimate Fair Value of Shares to Be Issued as of Grant Date | The Company uses the Black-Scholes model to estimate the fair value of shares to be issued as of the grant date using the following weighted average assumptions:
|  | September 28, 2019 |  | September 29, 2018 |  | September 30, 2017
Assumptions: |  |  |  |  |  |
Risk-free interest rates |  | 2.27 | % |  | 1.62 | % |  | 0.72 | %
Expected life (in years) |  | 0.5 |  |  | 0.5 |  |  | 0.5 |
Expected volatility |  | 27.1 | % |  | 25.0 | % |  | 24.9 | %
Dividend yield |  | — |  |  | — |  |  | — |

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- Definition Tabular disclosure of significant assumptions used during the year to estimate the fair value of employee stock purchase plan shares, including, but not limited to: (a) expected term, (b) expected volatility, (c) risk-free interest rate, and (d) dividend yield. + References No definition available. + 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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