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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 28, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The components and classification of stock-based compensation expense for fiscal years 2018, 2017 and 2016 were as follows (in thousands):
| 2018 |  | 2017 |  | 2016
Stock options | $ | 873 |  |  | $ | 1,633 |  |  | $ | 2,455 |
RSAs and RSUs (time-based) | 6,024 |  |  | 4,952 |  |  | 1,764 |
PRSUs | 3,159 |  |  | 6,867 |  |  | 3,887 |
Stock-based compensation expense - continuing operations | 10,056 |  |  | $ | 13,452 |  |  | $ | 8,106 |
Discontinued operations | 414 |  |  | 1,228 |  |  | 302 |
Total stock-based compensation expense | $ | 10,470 |  |  | $ | 14,680 |  |  | $ | 8,408 |
Cost of sales | $ | 849 |  |  | $ | 748 |  |  | $ | 208 |
SG&A | 9,090 |  |  | 9,893 |  |  | 6,086 |
RD&E | 112 |  |  | 642 |  |  | 337 |
OOE | 5 |  |  | 2,169 |  |  | 1,475 |
Discontinued operations | 414 |  |  | 1,228 |  |  | 302 |
Total stock-based compensation expense | $ | 10,470 |  |  | $ | 14,680 |  |  | $ | 8,408 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The following table includes the weighted average grant date fair value of stock options granted to employees during fiscal years 2018, 2017 and 2016 and the related weighted average assumptions used in the Black-Scholes model:
| 2018 |  | 2017 |  | 2016
Weighted average fair value of options granted | $ | 14.89 |  |  | $ | 12.86 |  |  | $ | 8.52 |
Assumptions: |  |  |  |  |
Expected term (in years) | 4.0 |  |  | 4.5 |  |  | 4.7 |
Risk-free interest rate | 2.21 | % |  | 1.77 | % |  | 1.49 | %
Expected volatility | 39 | % |  | 37 | % |  | 27 | %
Expected dividend yield | 0 | % |  | 0 | % |  | 0 | %
Schedule of Share-based Compensation, Stock Options, Activity | The following table summarizes stock option activity during the fiscal year ended December 28, 2018:
| Number of Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions)
Outstanding at December 29, 2017 | 931,353 |  |  | $ | 30.89 |  |  |  |  |
Granted | 28,447 |  |  | 45.13 |  |  |  |  |
Exercised | (413,317 | ) |  | 30.02 |  |  |  |  |
Forfeited or expired | (23,700 | ) |  | 41.28 |  |  |  |  |
Outstanding at December 28, 2018 | 522,783 |  |  | $ | 31.88 |  |  | 5.8 |  | $ | 23.1 |
Vested and expected to vest at December 28, 2018 | 522,783 |  |  | $ | 31.88 |  |  | 5.8 |  | $ | 23.1 |
Exercisable at December 28, 2018 | 488,468 |  |  | $ | 31.37 |  |  | 5.6 |  | $ | 21.8 |
Schedule Of Stock Option Exercise Information | The following table provides certain information relating to the exercise of stock options during fiscal years 2018, 2017 and 2016 (in thousands):
| 2018 |  | 2017 |  | 2016
Intrinsic value | $ | 17,722 |  |  | $ | 13,928 |  |  | $ | 690 |
Cash received | 12,409 |  |  | 19,324 |  |  | 2,821 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | The following table summarizes time-vested RSA and RSU activity during the fiscal year ended December 28, 2018:
| Time-Vested Restricted Stock Units and Awards |  | Weighted Average Grant Date Fair Value
Nonvested at December 29, 2017 | 163,431 |  |  | $ | 35.96 |
Granted | 167,514 |  |  | 52.14 |
Vested | (134,423 | ) |  | 38.88 |
Forfeited | (54,286 | ) |  | 42.44 |
Nonvested at December 28, 2018 | 142,236 |  |  | $ | 49.78 |
The following table summarizes the maximum number of PRSUs which could be earned and related activity during the fiscal year ended December 28, 2018:
| Performance- Vested Restricted Stock Units and Awards |  | Weighted Average Grant Date Fair Value
Nonvested at December 29, 2017 | 469,889 |  |  | $ | 32.37 |
Granted | 159,669 |  |  | 45.37 |
Vested | (161,674 | ) |  | 35.28 |
Forfeited | (180,750 | ) |  | 35.24 |
Nonvested at December 28, 2018 | 287,134 |  |  | $ | 36.15 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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