Shareholders' Equity (Other than Options) (Details) - $ / shares	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Restricted Stock
Shares
Unvested Shares, Beginning Balance (in shares)	15,660
Granted, Shares (in shares)	15,571
Vested, Shares (in shares)	(15,660)
Unvested Shares, Ending Balance (in shares)	15,571	15,660
Weighted Average Fair Value at Grant Date
Beginning Balance (in dollars per share)	$ 74.38
Granted (in dollars per share)	80.41	$ 74.68	$ 80.70
Vested (in dollars per share)	74.38
Ending Balance (in dollars per share)	$ 80.41	$ 74.38
Weighted Average Remaining Contractual Term	12 days	12 days
Restricted Stock Units (RSUs)
Shares
Unvested Shares, Beginning Balance (in shares)	234,824
Granted, Shares (in shares)	93,428
Vested, Shares (in shares)	(136,372)
Forfeited, Shares (in shares)	(16,855)
Unvested Shares, Ending Balance (in shares)	175,025	234,824
Weighted Average Fair Value at Grant Date
Beginning Balance (in dollars per share)	$ 69.78
Granted (in dollars per share)	78.98	$ 74.51	80.48
Vested (in dollars per share)	64.47
Forfeited (in dollars per share)	76.34
Ending Balance (in dollars per share)	$ 78.19	$ 69.78
Weighted Average Remaining Contractual Term	1 year 10 months 24 days	1 year 7 months 6 days
Performance Share Units
Shares
Unvested Shares, Beginning Balance (in shares)	167,840
Granted, Shares (in shares)	48,091
Vested, Shares (in shares)	(64,961)
Forfeited, Shares (in shares)	(60,405)
Unvested Shares, Ending Balance (in shares)	90,565	167,840
Weighted Average Fair Value at Grant Date
Beginning Balance (in dollars per share)	$ 71.71
Granted (in dollars per share)	85.54	$ 83.80	$ 90.82
Vested (in dollars per share)	65.85
Forfeited (in dollars per share)	67.90
Ending Balance (in dollars per share)	$ 86.35	$ 71.71
Weighted Average Remaining Contractual Term	1 year 10 months 24 days	1 year 9 months 18 days

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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