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Equity Compensation - Vesting (Details) - $ / shares	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Equity Compensation
Award vesting period, in years	3 years
Weighted average grant-date fair values of options granted	$ 11.69	$ 15.27	$ 19.88
Options granted, shares	353,000	456,000	315,000
Options
Equity Compensation
Award vesting period, in years	3 years
Options | Maximum
Equity Compensation
Award expiration period, in years	10 years

X

- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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Gross number of share options (or share units) granted during the period.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Publisher FASB
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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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