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Western Digital Corporation 401(k) Plan - Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2022 | Jul. 01, 2022 | Jul. 02, 2021 | Jul. 03, 2020
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 |  | $ 36 | $ 34 | $ 33
Pre-Tax |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, maximum annual contributions per employee, percent | 85.00% | 75.00% |  |
Pre Tax and Post Tax |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, maximum annual contributions per employee, percent | 10.00% | 10.00% |  |
Post-Tax |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined contribution plan, maximum annual contributions per employee, percent |  | 10.00% |  |
After Amendment |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company contributions vest period |  | 2 years |  |

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