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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Disaggregation of Revenues, Geographic Sales and Product Sales - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 29, 2019 Country Segment	Mar. 30, 2018	Dec. 28, 2018
Geographic and Product Data [Line Items]
Number of countries in which Company operates \| Country	75
Number of operating segments \| Segment	1
Sales Revenue, Net \| Customer One [Member]
Geographic and Product Data [Line Items]
Concentration risk, percentage	36.00%	29.00%
Sales Revenue, Net \| Geographic Concentration Risk [Member] \| Other than China, Japan, Korea [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	37.00%		36.00%