v3.26.1
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
 12 Months Ended
Jul. 03, 2026
Jun. 27, 2025
Jun. 28, 2024
Numerator:      
Net income $ 3,184 $ 1,469 $ 335
Number of shares used in per share calculations:      
Total shares for purposes of calculating basic net income per share attributable to Seagate Technology plc 219,000 212,000 209,000
Weighted-average effect of dilutive securities:      
Employee equity award plans 4,000 2,000 2,000
Total shares for purpose of calculating diluted net income per share attributable to Seagate Technology plc 229,000 217,000 212,000
Net income per share attributable to Seagate Technology plc ordinary shareholders:      
Basic net income per share (in dollars per share) $ 14.54 $ 6.93 $ 1.60
Diluted net income per share (in dollars per share) $ 13.90 $ 6.77 $ 1.58
Potential common shares excluded from the computation of diluted net income (loss) per share (in shares) 0 0 0
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 6,000 3,000 1,000