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Stock-Based Compensation (Tables) | 6 Months Ended
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Mar. 28, 2015
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 28, 2015 |  | March 29, 2014 |  | March 28, 2015 |  | March 29, 2014
Cost of revenues | $ | 2.3 |  |  | $ | 2.1 |  |  | $ | 4.3 |  |  | $ | 3.6 |
Research and development | 2.2 |  |  | 2.2 |  |  | 4.1 |  |  | 4.1 |
Selling and marketing | 2.3 |  |  | 2.4 |  |  | 4.3 |  |  | 4.1 |
General and administrative | 6.9 |  |  | 5.7 |  |  | 13.0 |  |  | 9.5 |
Restructuring and divestiture | — |  |  | — |  |  | 0.1 |  |  | 4.8 |
| $ | 13.7 |  |  | $ | 12.4 |  |  | $ | 25.8 |  |  | $ | 26.1 |
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 28, 2015 |  | March 29, 2014 |  | March 28, 2015 |  | March 29, 2014
Risk-free interest rate | 1.7 | % |  | 1.3 | % |  | 1.7 | % |  | 1.2 | %
Expected volatility | 38.6 | % |  | 41.4 | % |  | 38.6 | % |  | 41.4 | %
Expected life (in years) | 5.3 |  |  | 4.5 |  |  | 5.3 |  |  | 4.4 |
Dividend yield | — |  |  | — |  |  | — |  |  | — |
Weighted average fair value of options granted | $ | 10.36 |  |  | $ | 7.82 |  |  | $ | 9.55 |  |  | $ | 7.65 |

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- Definition Schedule of share-based compensation expense. + 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://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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