Stock Plans (Summary of Stock Option Activity) (Details) - $ / shares shares in Thousands	12 Months Ended
Dec. 29, 2019	Dec. 30, 2018
Stock option activity
Shares outstanding at beginning of the year	1,765
Shares granted	304
Shares exercised	(415)
Shares canceled		(3)
Shares forfeited	(116)
Shares outstanding at end of year	1,535	1,765
Shares exercisable at end of year	954
Number of shares vested and expected to vest in the future	1,500
Weighted-average price, outstanding at beginning of year (per share)	$ 52.91
Weighted-average price, granted (per share)	93.66
Weighted-average price, exercised (per share)	47.60
Weighted-average price, canceled (per share)		$ 75.52
Weighted-average price, forfeited (per share)	78.71
Weighted-average price, outstanding at end of year (per share)	60.42	$ 52.91
Weighted-average price, exercisable at end of year (per share)	$ 48.65

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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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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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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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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 of the plan that expired.

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

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