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Net Income (Loss) per Common Share - Narrative (Details) - $ / shares shares in Millions | Apr. 03, 2026 | Jun. 27, 2025 | Feb. 21, 2025
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Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Shares issued (in shares) | 148 | 146 | 145
Par value (in dollars per share) | $ 0.01 | $ 0.01 | $ 0.01
Western Digital Corporation |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Percent distribution of shares |  |  | 80.10%

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