STOCKHOLDERS' EQUITY - Activity Under the Employee Option Plans (Details) - Share-based Payment Arrangement, Option [Member] - $ / shares	12 Months Ended
Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Beginning balance	347,700	399,500	488,200
Exercised	(147,000.0)	(51,800)	(88,700)
Ending balance	200,700	347,700	399,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Beginning balance, weighted average exercise price	$ 49.54	$ 46.96	$ 48.68
Exercised, weighted average exercise price	32.14	29.64	56.43
Ending balance, weighted average exercise price	$ 62.27	$ 49.54	$ 46.96
Options exercisable at year end	200,700	347,700	399,500
Options exercisable at year end, weighted average exercise price	$ 62.27	$ 49.54	$ 46.96

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.

+ References

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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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No definition available.

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

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