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Stock-Based Compensation (Tables) | 6 Months Ended
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Mar. 31, 2018
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 Income:
| Three Months Ended |  | Six Months Ended
| March 31, 2018 |  | April 1, 2017 |  | March 31, 2018 |  | April 1, 2017
Cost of revenues | $ | 2.5 |  |  | $ | 3.6 |  |  | $ | 4.7 |  |  | $ | 6.4 |
Research and development | 2.9 |  |  | 4.1 |  |  | 5.4 |  |  | 6.9 |
Selling and marketing | 2.5 |  |  | 3.2 |  |  | 5.4 |  |  | 5.9 |
General and administrative | 11.6 |  |  | 8.9 |  |  | 19.1 |  |  | 19.8 |
Restructuring | — |  |  | — |  |  | 1.3 |  |  | — |
| $ | 19.5 |  |  | $ | 19.8 |  |  | $ | 35.9 |  |  | $ | 39.0 |
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 31, 2018 |  | April 1, 2017 |  | March 31, 2018 |  | April 1, 2017
Risk-free interest rate | 2.1 | % |  | 1.8 | % |  | 2.1 | % |  | 1.8 | %
Expected volatility | 35.3 | % |  | 36.5 | % |  | 35.3 | % |  | 36.6 | %
Expected life (in years) | 4.7 |  |  | 4.7 |  |  | 4.7 |  |  | 4.7 |
Dividend yield | — |  |  | — |  |  | — |  |  | — |
Weighted average fair value of options granted | $ | 12.53 |  |  | $ | 13.44 |  |  | $ | 12.98 |  |  | $ | 12.28 |

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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=96867065&loc=d3e5070-113901 + Details
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