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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Financial Statement Line Items in Which Stock-based Compensation is Reflected | The following table provides the financial statement line items in which stock-based compensation is reflected:
| Fiscal Year
| 2016 |  | 2015 |  | 2014
| (in thousands)
Cost of revenue (excluding amortization of intangible assets) | $ | 6,508 |  |  | $ | 6,511 |  |  | $ | 5,382 |
Selling, general and administrative | 37,134 |  |  | 33,611 |  |  | 25,653 |
Stock-based compensation expense, before income taxes | 43,642 |  |  | 40,122 |  |  | 31,035 |
Provision for income taxes | (15,548 | ) |  | (14,225 | ) |  | (11,006 | )
Stock-based compensation, net of income taxes | $ | 28,094 |  |  | $ | 25,897 |  |  | $ | 20,029 |
Summary of Stock Option Activity | The following table summarizes stock option activities under the Company’s stock-based compensation plans:
| Number of shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (in years) |  | Aggregate Intrinsic Value
| (in thousands, except per share amounts)
Options outstanding as of December 26, 2015 | 2,066 |  |  | $ | 50.62 |  |  |  |  |  |
Options granted | 588 |  |  | $ | 74.13 |  |  |  |  |  |
Options exercised | (601 | ) |  | $ | 38.52 |  |  |  |  |  |
Options canceled | (83 | ) |  | $ | 62.66 |  |  |  |  |  |
Options outstanding as of December 31, 2016 | 1,970 |  |  | $ | 60.82 |  |  | 3.4 |  | $ | 30,638 |
Options exercisable as of December 31, 2016 | 746 |  |  | $ | 48.34 |  |  | 2.6 |  | $ | 20,817 |
Options expected to vest as of December 31, 2016 | 1,202 |  |  | $ | 68.40 |  |  | 3.8 |  | $ | 9,690 |
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
| 2016 |  | 2015 |  | 2014
Expected life (in years) | 3.6 |  |  | 3.6 |  |  | 4.2 |
Expected volatility | 25 | % |  | 28 | % |  | 30 | %
Risk-free interest rate | 1.2 | % |  | 1.1 | % |  | 1.5 | %
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 2016:
| Restricted Stock and Restricted Stock Units |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
December 26, 2015 | 607 |  |  | $ | 55.52 |
Granted | 236 |  |  | $ | 75.10 |
Vested | (296 | ) |  | $ | 49.29 |
Canceled | (32 | ) |  | $ | 63.36 |
December 31, 2016 | 515 |  |  | $ | 67.62 |
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
| 2016 |  | 2015 |  | 2014
PSUs granted | 190,628 |  |  | 148,900 |  |  | 214,823 |
Weighted average per share fair value | $ | 80.38 |  |  | $ | 88.62 |  |  | $ | 67.82 |
Key Assumptions: |  |  |  |  |
Expected volatility | 24 | % |  | 23 | % |  | 29 | %
Risk-free interest rate | 0.91 | % |  | 0.96 | % |  | 0.63 | %
Expected dividend yield | — | % |  | — | % |  | — | %
20 trading day average stock price on grant date | (4.8 | )% |  | 20.6 | % |  | 13.1 | %

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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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