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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Disaggregation of Sales, Geographic Sales and Product Sales - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 02, 2020 Country	Sep. 27, 2019	Oct. 02, 2020 Country Segment	Sep. 27, 2019	Jan. 03, 2020
Geographic and Product Data [Line Items]
Number of countries in which Company operates \| Country	75		75
Number of operating segments \| Segment			1
Sales Revenue, Net \| Customer One [Member]
Geographic and Product Data [Line Items]
Concentration risk, percentage	49.00%	47.00%	46.00%	44.00%
Sales Revenue, Net \| Geographic Concentration Risk [Member] \| Other than China and Japan [Member] \| Maximum
Geographic and Product Data [Line Items]
Concentration risk, percentage			10.00%
Sales Revenue, Net \| Product Concentration Risk [Member] \| Ophthalmic Surgical Product [Member]
Geographic and Product Data [Line Items]
Concentration risk, percentage			100.00%
Accounts Receivable [Member] \| Customer One [Member]
Geographic and Product Data [Line Items]
Concentration risk, percentage			59.00%		43.00%