XML 71 R58.htm IDEA: XBRL DOCUMENT v3.8.0.1

Shareholders' Equity Unrecognized Share-based Compensation (Details) $ in Millions	3 Months Ended
	Sep. 29, 2017 USD ($)
Employee Service Share-based Compensation, Unrecognized Service Costs [Line Items]
Unamortized Compensation Costs	$ 731
Options
Employee Service Share-based Compensation, Unrecognized Service Costs [Line Items]
Unamortized Compensation Costs	$ 46
Remaining Periods to Recognize Stock-based Compensation	2 years 4 months
RSUs and PSUs
Employee Service Share-based Compensation, Unrecognized Service Costs [Line Items]
Unamortized Compensation Costs	$ 662
Remaining Periods to Recognize Stock-based Compensation	2 years 5 months	[1]
ESPP
Employee Service Share-based Compensation, Unrecognized Service Costs [Line Items]
Unamortized Compensation Costs	$ 23
Remaining Periods to Recognize Stock-based Compensation	8 months
[1] Weighted average service period assumes the performance metrics are met for the PSUs.

X

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

[Line Items] for Schedule of employee share-based awards, unrecognized compensation in tabular format.

+ References

No definition available.

+ Details

Name:	wdc_EmployeeServiceSharebasedCompensationUnrecognizedServiceCostsLineItems
Namespace Prefix:	wdc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=wdc_EmployeeStockPurchasePlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: