v3.26.3
Earnings Per Share (Schedule of computation of basic and diluted net income (loss) per share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Oct. 02, 2026
Oct. 03, 2025
Numerator:    
Net income $ 1,761 $ 549
Number of shares used in per share calculations:    
Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc 228,000 213,000
Weighted-average effect of dilutive securities:    
Employee equity award plans 4,000 13,000
Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc 232,000 226,000
Net income per share attributable to Seagate Technology plc ordinary shareholders:    
Basic net income per share (in dollars per share) $ 7.72 $ 2.58
Diluted net income per share (in dollars per share) $ 7.59 $ 2.43
Potential common shares excluded from the computation of diluted net income (loss) per share (in shares) 0 0