Stock Plans (Summary of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
Apr. 05, 2020 USD ($) $ / shares shares
Stock option activity
Number of Shares, Outstanding at beginning of period \| shares	1,535
Number of Shares, Granted \| shares	266
Number of Shares, Exercised \| shares	(21)
Number of Shares, Forfeited \| shares	(30)
Number of Shares, Outstanding at end of period \| shares	1,750
Number of Shares, Exercisable at end of period \| shares	1,296
Weighted-Average Price, Outstanding at beginning of period \| $ / shares	$ 60.42
Weighted-Average Price, Granted \| $ / shares	86.87
Weighted-Average Price, Exercised \| $ / shares	52.69
Weighted-Average Price, Forfeited \| $ / shares	85.13
Weighted-Average Price, Outstanding at end of period \| $ / shares	64.10
Weighted-Average Price, Exercisable at end of period \| $ / shares	$ 56.01
Weighted-Average Remaining Contractual Term in Years, Outstanding at end of period	3 years 8 months 12 days
Weighted-Average Remaining Contractual Term in Years, Exercisable at end of period	2 years 8 months 12 days
Total Intrinsic Value, Outstanding at end of period \| $	$ 24.0
Total Intrinsic Value, Exercisable at end of period \| $	$ 23.9

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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