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Stock-Based Compensation | 6 Months Ended
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Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [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 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 |
The Company granted 1.7 million and 1.0 million stock options during the six months ended March 31, 2018 and April 1, 2017, respectively, with weighted-average exercise prices of $40.76 and $37.94, respectively. There were 6.6 million options outstanding at March 31, 2018 with a weighted-average exercise price of $31.56. 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 |
The Company granted 0.8 million and 1.0 million restricted stock units (RSUs) during each of the six months ended March 31, 2018 and April 1, 2017, respectively, with weighted-average grant date fair values of $40.75 and $37.74 per unit, respectively. As of March 31, 2018, there were 1.9 million unvested RSUs outstanding with a weighted-average grant date fair value of $37.86 per unit. In addition, the Company granted 0.4 million and 0.1 million performance stock units (PSUs) during the six months ended March 31, 2018 and April 1, 2017, respectively, to members of its senior management team, which have a weighted-average grant date fair value of $40.86 and $37.70 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 is recognizing compensation expense 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 will cumulatively adjust compensation expense in the period that the change in estimate is made. The Company also granted 0.3 million and 0.1 million market based awards (MSUs) to its senior management team during the six months ended March 31, 2018 and April 1, 2017, 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 $49.45 and $48.90 per share using the Monte Carlo simulation model. The Company is recognizing compensation expense for the MSUs ratably over the service period. At March 31, 2018, there was $32.5 million and $81.1 million of unrecognized compensation expense related to stock options and stock units (comprised of RSUs and PSUs), respectively, to be recognized over a weighted-average period of 2.9 and 2.1 years, respectively.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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