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Stock-Based Compensation (Tables) | 6 Months Ended
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Mar. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation Expense in Consolidated Statements of Operations | The following presents stock-based compensation expense in the Company’s Consolidated Statements of Operations:
| Three Months Ended |  | Six Months Ended
| March 30, 2019 |  | March 31, 2018 |  | March 30, 2019 |  | March 31, 2018
Cost of revenues | $ | 2.0 |  |  | $ | 2.5 |  |  | $ | 4.0 |  |  | $ | 4.7 |
Research and development | 2.7 |  |  | 2.9 |  |  | 5.4 |  |  | 5.4 |
Selling and marketing | 2.7 |  |  | 2.5 |  |  | 5.4 |  |  | 5.4 |
General and administrative | 10.1 |  |  | 11.6 |  |  | 19.8 |  |  | 19.1 |
Restructuring | — |  |  | — |  |  | — |  |  | 1.3 |
| $ | 17.5 |  |  | $ | 19.5 |  |  | $ | 34.6 |  |  | $ | 35.9 |
Weighted-Average Assumptions Utilized to Value Stock Options | The Company uses a binomial model to determine the fair value of its stock options. The weighted-average assumptions utilized to value these stock options are indicated in the following table:
| Three Months Ended |  | Six Months Ended
| March 30, 2019 |  | March 31, 2018 |  | March 30, 2019 |  | March 31, 2018
Risk-free interest rate | 3.0 | % |  | 2.1 | % |  | 3.0 | % |  | 2.1 | %
Expected volatility | 34.3 | % |  | 35.3 | % |  | 34.3 | % |  | 35.3 | %
Expected life (in years) | 4.8 |  |  | 4.7 |  |  | 4.8 |  |  | 4.7 |
Dividend yield | — |  |  | — |  |  | — |  |  | — |
Weighted average fair value of options granted | $ | 15.33 |  |  | $ | 12.53 |  |  | $ | 13.50 |  |  | $ | 12.98 |

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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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