Debt - Additional Information (Details) - USD ($) $ in Millions			12 Months Ended
	Aug. 04, 2025	Feb. 21, 2025	Jun. 27, 2025	Jun. 28, 2024	Jun. 30, 2023
Debt Instrument [Line Items]
Repayments of debt			$ 100	$ 0	$ 0
Western Digital Corporation
Debt Instrument [Line Items]
Dividends paid		$ 1,500
Term B Loan | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		2,000
Term B Loan | Line of Credit | Subsequent Event
Debt Instrument [Line Items]
Repayments of debt	$ 100
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,500