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Stock-Based Compensation | 6 Months Ended
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Mar. 28, 2020
Share-based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-Based Compensation The following presents stock-based compensation expense in the Company’s Consolidated Statements of Income:
| Three Months Ended |  | Six Months Ended
| March 27, 2021 |  | March 28, 2020 |  | March 27, 2021 |  | March 28, 2020
Cost of revenues | $ | 2.3 |  |  | $ | 1.7 |  |  | $ | 4.5 |  |  | $ | 3.8 |
Research and development | 2.3 |  |  | 2.3 |  |  | 4.8 |  |  | 4.6 |
Selling and marketing | 2.7 |  |  | 2.8 |  |  | 5.4 |  |  | 5.6 |
General and administrative | 9.7 |  |  | 6.5 |  |  | 20.9 |  |  | 17.4 |
Restructuring | — |  |  | 2.4 |  |  | — |  |  | 2.4 |
| $ | 17.0 |  |  | $ | 15.7 |  |  | $ | 35.6 |  |  | $ | 33.8 |
The Company granted options to purchase 0.6 million and 0.9 million shares of the Company's common stock during the six months ended March 27, 2021 and March 28, 2020, respectively, with weighted-average exercise prices of $68.64 and $45.82, respectively. There were 4.5 million options outstanding at March 27, 2021 with a weighted-average exercise price of $44.53. 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 27, 2021 |  | March 28, 2020 |  | March 27, 2021 |  | March 28, 2020
Risk-free interest rate | 0.4 | % |  | 1.7 | % |  | 0.4 | % |  | 1.7 | %
Expected volatility | 35.0 | % |  | 33.6 | % |  | 35.0 | % |  | 33.6 | %
Expected life (in years) | 4.8 |  | 4.8 |  | 4.8 |  | 4.8
Dividend yield | — |  |  | — |  |  | — |  |  | — |
Weighted average fair value of options granted | $ | 21.17 |  |  | $ | 14.45 |  |  | $ | 20.08 |  |  | $ | 13.87 |
The Company granted 0.5 million and 0.8 million restricted stock units (RSUs) during the six months ended March 27, 2021 and March 28, 2020, respectively, with weighted-average grant date fair values of $68.51 and $45.76 per unit, respectively. In addition, the Company granted 0.1 million and 0.1 million performance stock units (PSUs) during the six months ended March 27, 2021 and March 28, 2020, respectively, to members of its senior management team, which have a weighted-average grant date fair value of $68.51 and $45.76 per unit, respectively. Each recipient of PSUs is eligible to receive between zero and 200% of the target number of shares of the Company’s common stock at the end of three years provided the Company’s defined Return on Invested Capital metrics are achieved. The Company also granted 0.1 million and 0.1 million of PSUs based on a one-year free cash flow measure (FCF) to its senior management team, which had a grant date fair value of $68.51 and $45.76 per unit during the six months ended March 27, 2021 and March 28, 2020, respectively. Each recipient of FCF PSUs is eligible to receive between zero and 200% of the target number of shares of the Company's common stock at the end of the one-year measurement period, but the FCF PSUs vest at the end of the three year service period. The PSUs and FCF PSUs cliff-vest three years from the date of grant, and the Company recognizes compensation expense ratably over the required service period based on its estimate of the number of shares that will vest upon achieving the measurement criteria. If there is a change in the estimate of the number of shares that are probable of vesting, the Company will cumulatively adjust compensation expense in the period that the change in estimate is made. The Company also granted 0.1 million and 0.1 million market-based awards (MSUs) to its senior management team during the three months ended March 27, 2021 and March 28, 2020, respectively. Each recipient of MSUs is eligible to receive between zero and 200% of the target number of shares of the Company’s common stock at the end of three years based upon achieving a certain total shareholder return relative to a defined peer group. The MSUs were valued at $82.31 and $43.90 per share using the Monte Carlo simulation model. These awards cliff-vest three years from the date of grant, and the Company recognizes compensation expense for the MSUs ratably over the service period. At March 27, 2021, there was 3.1 million in aggregate RSUs, PSUs, FCF PSUs and MSUs outstanding. At March 27, 2021, there was $23.0 million and $71.7 million of unrecognized compensation expense related to stock options and stock units (comprised of RSUs, PSUs, FCF PSUs and MSUs), respectively, to be recognized over a weighted-average period of 2.5 and 2.1 years, respectively.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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