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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 29, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Financial Statement Line Items in Which Stock-based Compensation is Reflected | The following table provides stock-based compensation by the financial statement line item in which it is reflected:
| Fiscal Year
| 2018 |  | 2017 |  | 2016
| (in thousands)
Cost of revenue | $ | 6,285 |  |  | $ | 6,509 |  |  | $ | 6,508 |
Selling, general and administrative | 41,061 |  |  | 37,494 |  |  | 37,134 |
Stock-based compensation, before income taxes | 47,346 |  |  | 44,003 |  |  | 43,642 |
Provision for income taxes | (9,188 | ) |  | (13,428 | ) |  | (15,548 | )
Stock-based compensation, net of income taxes | $ | 38,158 |  |  | $ | 30,575 |  |  | $ | 28,094 |
Summary of Stock Option Activity | The following table summarizes stock option activity under the Company’s stock-based compensation plans:
| Number of shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic Value
| (in thousands) |  |  |  | (in years) |  | (in thousands)
Options outstanding as of December 30, 2017 | 1,774 |  |  | $ | 73.19 |  |  |  |  |  |
Options granted | 508 |  |  | $ | 109.32 |  |  |  |  |  |
Options exercised | (576 | ) |  | $ | 65.40 |  |  |  |  |  |
Options canceled | (150 | ) |  | $ | 88.17 |  |  |  |  |  |
Options outstanding as of December 29, 2018 | 1,556 |  |  | $ | 86.44 |  |  | 2.9 |  | $ | 39,300 |
Options exercisable as of December 29, 2018 | 379 |  |  | $ | 66.91 |  |  | 1.8 |  | $ | 16,991 |
Options expected to vest as of December 29, 2018 | 1,175 |  |  | $ | 92.74 |  |  | 3.2 |  | $ | 22,309 |
Weighted-average Assumptions | The fair value of stock options granted was estimated using the Black-Scholes option-pricing model with the following weighted-average assumptions:
| Fiscal Year
| 2018 |  | 2017 |  | 2016
Expected life (in years) | 3.7 |  |  | 3.6 |  |  | 3.6 |
Expected volatility | 25 | % |  | 24 | % |  | 25 | %
Risk-free interest rate | 2.4 | % |  | 1.6 | % |  | 1.2 | %
Expected dividend yield | 0 | % |  | 0 | % |  | 0 | %
Summary of Restricted Stock and Restricted Stock Unit Activity | The following table summarizes the restricted stock and restricted stock units activity for fiscal year 2018:
| Restricted Stock and Restricted Stock Units |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
December 30, 2017 | 514 |  |  | $ | 80.45 |
Granted | 221 |  |  | $ | 109.15 |
Vested | (201 | ) |  | $ | 76.84 |
Canceled | (44 | ) |  | $ | 92.78 |
December 29, 2018 | 490 |  |  | $ | 93.80 |
Information about PSUs and Related Weighted-Average Assumptions | The Company utilizes a Monte Carlo simulation valuation model to value these awards. Information pertaining to the Company’s PSUs and the related estimated weighted-average assumptions used to calculate their fair value were as follows:
| Fiscal Year
| 2018 |  | 2017 |  | 2016
PSUs granted | 200,333 |  |  | 197,645 |  |  | 190,628 |
Weighted average grant date fair value | $ | 117.89 |  |  | $ | 99.96 |  |  | $ | 80.38 |
Key Assumptions: |  |  |  |  |
Expected volatility | 26 | % |  | 26 | % |  | 24 | %
Risk-free interest rate | 2.4 | % |  | 1.3 | % |  | 0.9 | %
Expected dividend yield | 0 | % |  | 0 | % |  | 0 | %
20 trading day average stock price on grant date | 2.9 | % |  | 17.7 | % |  | (4.8 | )%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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