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STOCK-BASED COMPENSATION - Cash-based equity awards and 2024 transition incentive award (Details) - USD ($) $ in Thousands		3 Months Ended
	Jun. 28, 2024	Jun. 30, 2024	Sep. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Reclassification of incentive plan liabilities to additional paid-in capital		$ 54,795
GRAIL 2024 Cash-Based Equity Awards Program
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Reclassification of incentive plan liabilities to additional paid-in capital	$ 50,300
Transition Incentive Award | Grail, Inc. 2024 Transition Incentive Award Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Reclassification of incentive plan liabilities to additional paid-in capital	$ 4,400
Restricted Stock Units (RSUs) | Grail, Inc. 2024 Transition Incentive Award Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Grail RSUs (in shares)			2,500,000
Restricted Stock Units (RSUs) | GRAIL 2021 Cash-Based Equity Awards Program
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Grail RSUs (in shares)			4,000,000

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Additional Paid In Capital, Reclassification Of Liability-Classified Equity Awards, Fair Value

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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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