Stockholders’ Equity - Summary of Restricted Stock Activity and Related Information (Details) shares in Thousands	9 Months Ended
Oct. 03, 2021 $ / shares shares
Restricted Stock Units (RSUs)
Stock Units
Outstanding at period start (in shares)	1,721
Awarded (in shares)	183
Vested (in shares)	(92)
Cancelled (in shares)	(206)
Outstanding at period end (in shares)	1,606
Weighted-Average Grant Date Fair Value per Share
Outstanding at period start (in dollars per share) \| $ / shares	$ 313.35
Awarded (in dollars per share) \| $ / shares	464.17
Vested (in dollars per share) \| $ / shares	274.12
Cancelled (in dollars per share) \| $ / shares	316.92
Outstanding at period end (in dollars per share) \| $ / shares	$ 332.36
Restricted Stock Units (RSUs) \| GRAIL Inc
Stock Units
Awarded (in shares)	59
Performance Stock Units (PSU)
Stock Units
Outstanding at period start (in shares)	0
Awarded (in shares)	424
Vested (in shares)	0
Cancelled (in shares)	(34)
Outstanding at period end (in shares)	390
Weighted-Average Grant Date Fair Value per Share
Outstanding at period start (in dollars per share) \| $ / shares	$ 0
Awarded (in dollars per share) \| $ / shares	475.77
Vested (in dollars per share) \| $ / shares	0
Cancelled (in dollars per share) \| $ / shares	475.77
Outstanding at period end (in dollars per share) \| $ / shares	$ 475.77

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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