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Stock-Based Compensation
 9 Months Ended
Jun. 27, 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 Operations:
 Three Months EndedNine Months Ended
 June 27,
2020		June 29,
2019		June 27,
2020		June 29,
2019
Cost of revenues$1.4  $1.5  $5.2  $5.5  
Research and development1.7  2.0  6.3  7.4  
Selling and marketing2.3  2.5  7.9  7.9  
General and administrative14.5  7.9  31.9  27.7  
Restructuring—  —  2.4  —  
$19.9  $13.9  $53.7  $48.5  
The Company granted options to purchase 0.9 million and 1.0 million shares of the Company's common stock during the nine months ended June 27, 2020 and June 29, 2019, respectively, with weighted-average exercise prices of $45.54 and $41.28, respectively. There were 4.7 million options outstanding at June 27, 2020 with a weighted-average exercise price of $39.98.
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 EndedNine Months Ended
 June 27,
2020		June 29,
2019		June 27,
2020		June 29,
2019
Risk-free interest rate1.7 %3.0 %1.7 %3.0 %
Expected volatility33.6 %34.3 %33.6 %34.3 %
Expected life (in years)4.84.84.84.8
Dividend yield—  —  —  —  
Weighted average fair value of options granted$9.90  $15.07  $13.79  $13.51  
The Company granted 0.8 million and 0.9 million restricted stock units (RSUs) during the nine months ended June 27, 2020 and June 29, 2019, respectively, with weighted-average grant date fair values of $45.67 and $41.15 per unit, respectively. In addition, the Company granted 0.1 million and 0.1 million performance stock units (PSUs) during the nine months ended June 27, 2020 and June 29, 2019, respectively, to members of its senior management team, which have a weighted-average grant date fair value of $45.38 and $40.97 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 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 $45.38. 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 Company is recognizing compensation expense for PSUs and FCF PSUs ratably over the required service period based on its estimate of the number of shares that will vest. If there is a change in the estimate of the number of shares that are probable of vesting, the Company cumulatively adjusts 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 nine months ended June 27, 2020 and June 29, 2019, 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 $43.54 and $55.13 per share using the Monte Carlo simulation model. The Company is recognizing compensation expense for the MSUs ratably over the service period. At June 27, 2020, there was 2.5 million in aggregate RSUs, PSUs, FCF PSUs and MSUs outstanding.
At June 27, 2020, there was $23.2 million and $66.9 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 2.4 and 1.9 years, respectively.