Thailand Flooding - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Jul. 03, 2015	Jun. 27, 2014
Extraordinary and Unusual Items [Abstract]
Insurance recoveries and other cost reimbursement	$ 37	$ 65

Insurance recoveries and other cost reimbursements received related to the flood.

No definition available.

Name:	wdc_InsuranceRecoveriesAndOtherCostReimbursement
Namespace Prefix:	wdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration