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Stockholders' Equity and Stock-Based Compensation (Tables) | 12 Months Ended
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Sep. 24, 2016
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 2016, 2015 and 2014:
|  | 2016 |  | 2015 |  | 2014
Cost of revenues |  | $ | 10.5 |  |  | $ | 8.7 |  |  | $ | 7.3 |
Research and development |  | 10.8 |  |  | 8.6 |  |  | 8.4 |
Selling and marketing |  | 10.9 |  |  | 8.8 |  |  | 8.2 |
General and administrative |  | 32.8 |  |  | 29.1 |  |  | 19.5 |
Restructuring and divestiture |  | 0.4 |  |  | 4.1 |  |  | 6.6 |
|  | $ | 65.4 |  |  | $ | 59.3 |  |  | $ | 50.0 |
Information Pertaining to Stock Options Granted and Related Assumptions | Information pertaining to stock options granted during fiscal 2016, 2015 and 2014 and related assumptions are noted in the following table:
|  | Years ended
September 24, 2016 |  | September 26, 2015 |  | September 27, 2014
Options granted (in millions) |  | 1.1 |  |  | 1.3 |  |  | 2.4 |
Weighted-average exercise price |  | $ | 39.32 |  |  | $ | 27.68 |  |  | $ | 22.01 |
Weighted-average grant date fair value |  | $ | 12.91 |  |  | $ | 9.95 |  |  | $ | 7.67 |
Assumptions: |  |  |  |  |  |
Risk-free interest rates |  | 1.6 | % |  | 1.7 | % |  | 1.2 | %
Expected life (in years) |  | 4.7 |  |  | 5.3 |  |  | 4.4 |
Expected volatility |  | 37.8 | % |  | 38.6 | % |  | 41.4 | %
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 24, 2016:
|  | 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 26, 2015 |  | 6.7 |  |  | $ | 22.21 |  |  | 4.9 |  | $ | 119.1 |
Granted |  | 1.1 |  |  | 39.32 |  |  |  |  |
Canceled/ forfeited |  | (0.5 | ) |  | 27.00 |  |  |  |  |
Exercised |  | (1.2 | ) |  | 19.55 |  |  |  |  | $ | 21.6 |
Options outstanding at September 24, 2016 |  | 6.1 |  |  | $ | 25.37 |  |  | 4.9 |  | $ | 80.1 |
Options exercisable at September 24, 2016 |  | 3.0 |  |  | $ | 21.95 |  |  | 3.1 |  | $ | 48.8 |
Options vested and expected to vest at September 24, 2016 (1) |  | 5.9 |  |  | $ | 25.32 |  |  | 4.9 |  | $ | 79.0 |
(1) | This represents the number of vested stock options as of September 24, 2016 plus the unvested outstanding options at September 24, 2016 expected to vest in the future, adjusted for estimated forfeitures.
Restricted Stock Unit Activity | A summary of the Company’s RSU activity during the year ended September 24, 2016 is presented below:
Non-vested Shares |  | Number of Shares (in millions) |  | Weighted-Average Grant-Date Fair Value
Non-vested at September 26, 2015 |  | 3.7 |  |  | $ | 24.54 |
Granted |  | 1.0 |  |  | 39.38 |
Vested |  | (1.2 | ) |  | 22.96 |
Forfeited |  | (0.4 | ) |  | 25.74 |
Non-vested at September 24, 2016 |  | 3.1 |  |  | $ | 29.98 |
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 24, 2016 |  | September 26, 2015 |  | September 27, 2014
Assumptions: |  |  |  |  |  |
Risk-free interest rates |  | 0.34 | % |  | 0.10 | % |  | 0.08 | %
Expected life (in years) |  | 0.5 |  |  | 0.5 |  |  | 0.5 |
Expected volatility |  | 27.2 | % |  | 27.4 | % |  | 30.0 | %
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 number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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