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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 30, 2017
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
| 2017 |  | 2016 |  | 2015
| (in thousands)
Cost of revenue (excluding amortization of intangible assets) | $ | 6,509 |  |  | $ | 6,508 |  |  | $ | 6,511 |
Selling, general and administrative | 37,494 |  |  | 37,134 |  |  | 33,611 |
Stock-based compensation, before income taxes | 44,003 |  |  | 43,642 |  |  | 40,122 |
Provision for income taxes | (13,428 | ) |  | (15,548 | ) |  | (14,225 | )
Stock-based compensation, net of income taxes | $ | 30,575 |  |  | $ | 28,094 |  |  | $ | 25,897 |
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 31, 2016 | 1,970 |  |  | $ | 60.82 |  |  |  |  |  |
Options granted | 603 |  |  | $ | 88.35 |  |  |  |  |  |
Options exercised | (742 | ) |  | $ | 52.41 |  |  |  |  |  |
Options canceled | (57 | ) |  | $ | 76.78 |  |  |  |  |  |
Options outstanding as of December 30, 2017 | 1,774 |  |  | $ | 73.19 |  |  | 3.2 |  | $ | 64,274 |
Options exercisable as of December 30, 2017 | 469 |  |  | $ | 56.19 |  |  | 2.3 |  | $ | 24,958 |
Options expected to vest as of December 30, 2017 | 1,304 |  |  | $ | 79.30 |  |  | 3.5 |  | $ | 39,315 |
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
| 2017 |  | 2016 |  | 2015
Expected life (in years) | 3.6 |  |  | 3.6 |  |  | 3.6 |
Expected volatility | 24 | % |  | 25 | % |  | 28 | %
Risk-free interest rate | 1.6 | % |  | 1.2 | % |  | 1.1 | %
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 2017:
| Restricted Stock and Restricted Stock Units |  | Weighted Average Grant Date Fair Value
| (in thousands) |  |
December 31, 2016 | 515 |  |  | $ | 67.62 |
Granted | 253 |  |  | $ | 88.86 |
Vested | (223 | ) |  | $ | 60.82 |
Canceled | (31 | ) |  | $ | 77.43 |
December 30, 2017 | 514 |  |  | $ | 80.45 |
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
| 2017 |  | 2016 |  | 2015
PSUs granted | 197,645 |  |  | 190,628 |  |  | 148,900 |
Weighted average per share grant date fair value | $ | 99.96 |  |  | $ | 80.38 |  |  | $ | 88.62 |
Key Assumptions: |  |  |  |  |
Expected volatility | 26 | % |  | 24 | % |  | 23 | %
Risk-free interest rate | 1.34 | % |  | 0.91 | % |  | 0.96 | %
Expected dividend yield | 0 | % |  | 0 | % |  | 0 | %
20 trading day average stock price on grant date | 17.7 | % |  | (4.8 | )% |  | 20.6 | %

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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=96867065&loc=d3e5070-113901 + Details
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