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Stock-Based Compensation (Tables) | 3 Months Ended
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Apr. 02, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | (in thousands, except for grant date fair value amounts):
| Three Months Ended April 2, 2016
| Units |  | Weighted Average Grant Date Fair Value
RSUs outstanding, beginning of period | 2,703 |  |  | $ | 41.45 |
Granted | — |  |  | — |
Canceled | — |  |  | — |
Expired | — |  |  | — |
Vested | — |  |  | — |
RSUs outstanding, end of period | 2,703 |  |  | $ | 41.45 |
Number and Weighted Average Exercise Price of Options Issued and Outstanding under all Stock Option Plans | The number and weighted-average exercise price of options issued and outstanding under all of the Company’s stock option plans are as follows (in thousands, except for exercise prices):
| Three Months Ended April 2, 2016
| Shares |  | Average Exercise Price
Options outstanding, beginning of period | 9,202 |  |  | $ | 25.46 |
Granted | 1,101 |  |  | 37.87 |
Canceled | (32 | ) |  | 24.72 |
Exercised | (199 | ) |  | 17.29 |
Options outstanding, end of period | 10,072 |  |  | $ | 26.98 |
Options exercisable, end of period | 5,870 |  |  | $ | 25.10 |
Range of Assumptions Used and Resulting Weighted-Average Fair Value of Options Granted at Date of Grant | The range of assumptions used and the resulting weighted-average fair value of options granted at the date of grant were as follows:
| Three Months Ended
| April 2, 2016 |  | April 4, 2015
Risk-free interest rate | 1.3% to 1.9% |  | 1.3% to 1.8%
Expected term (in years) | 5.7 |  | 5.5
Estimated volatility | 34.6% to 35.7% |  | 33.5% to 37.4%
Expected dividends | 0% |  | 0%
Weighted-average fair value of options granted | $13.13 |  | $10.35

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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