Segment Reporting - Narrative (Details) $ in Thousands	3 Months Ended
Mar. 28, 2020 USD ($) segment	Mar. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	2
Net revenue	$ 469,704	$ 461,215
Customer Concentration Risk \| Sales revenue \| Legacy partner arrangement
Segment Reporting Information [Line Items]
Concentration risk (percent)	7.80%
Customer Concentration Risk \| Sales revenue \| AC Lens Walmart and Sam's Club contact lenses distribution arrangements
Segment Reporting Information [Line Items]
Concentration risk (percent)	8.60%
Legacy \| Management of operations
Segment Reporting Information [Line Items]
Net revenue	$ 7,500	$ 9,300

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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