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Western Digital Corporation 401(k) Plan - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 28, 2024
Jun. 30, 2023
Jul. 01, 2022
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 $ 13 $ 22 $ 36
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%