v3.25.4
Submission
3 Months Ended
Mar. 12, 2026
Mar. 31, 2026
Submission [Line Items]    
Central Index Key 0001699031  
Registrant Name   GRAIL, Inc.
Form Type S-8  
Submission Type S-8  
Fee Exhibit Type EX-FILING FEES  
Offset Table N/A N/A