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Overview (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions				9 Months Ended
	Feb. 03, 2020	Nov. 01, 2019	Oct. 01, 2019	Sep. 30, 2019	Mar. 02, 2020	Jan. 02, 2020	Dec. 02, 2019	Nov. 01, 2018
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Reverse terminantion fee				$ 98.0
Period in which company must repay continuation advances if change-of-controll transaction is entered into with third party				2 years
Equity or debt financing that must be raised in a single transaction				$ 100.0
Possible termination fee				$ 43.0
Illumina, FC Ops Corp [Member] | Pacific Biosciences of California, Inc. [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Purchase price, per share amount								$ 8.00
Payments due for merger			$ 6.0
Merger payments made			$ 6.0
Illumina, FC Ops Corp [Member] | Pacific Biosciences of California, Inc. [Member] | Forecast [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Payments due for merger					$ 6.0	$ 6.0	$ 6.0
Merger payments made	$ 22.0
Subsequent Event [Member] | Illumina, FC Ops Corp [Member] | Pacific Biosciences of California, Inc. [Member]
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Payments due for merger		$ 6.0
Merger payments made		$ 6.0

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