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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Data Type:	num:percentItemType
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Period Type:	duration

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Customer Concentration Risk (Details) - Customer Concentration Risk - Canon Medical Systems Corporation	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 29, 2019	Mar. 30, 2018	Mar. 29, 2019	Mar. 30, 2018	Sep. 28, 2018
Revenue from Contract with Customer
Concentration Risk [Line Items]
Concentration risk, percentage	17.10%	17.30%	17.70%	19.20%
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	11.60%				9.80%