Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Western Digital Corporation 401(k) Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 03, 2026	Jun. 27, 2025	Jun. 28, 2024
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent of match	50.00%
Defined contribution plan, employer matching contribution, percent of employees' gross pay	6.00%
Defined contribution plan, employer discretionary contribution amount	$ 23	$ 22	$ 8
Pre-Tax
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, maximum annual contributions per employee, percent	85.00%
Pre Tax and Post Tax
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, maximum annual contributions per employee, percent	10.00%