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Western Digital Corporation 401(k) Plan Additional Information (Details Textuals) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jul. 01, 2016
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	$ 35	$ 36	$ 20
Pre-Tax
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, maximum annual contributions per employee, percent	30.00%
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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Amount of discretionary contributions made by an employer to a defined contribution plan.

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