Name:	bby_PercentageOfMatchingContributionMadeByCompanyOfContributionsInExcessOf3PercentButNotMoreThan5PercentOfParticipatingEmployeesContribution
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Data Type:	dtr-types:percentItemType
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Percentage of employer matching contribution of the first 3% of participating employees' contribution.

No definition available.

Name:	bby_PercentageOfMatchingContributionMadeByCompanyOfFirstThreePercentageOfParticipatingEmployeesContribution
Namespace Prefix:	bby_
Data Type:	dtr-types:percentItemType
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Period Type:	duration

Percentage of participating employee's contribution, 50% matched by employer.

No definition available.

Name:	bby_PercentageOfParticipatingEmployeesContributionFiftyPercentMatched
Namespace Prefix:	bby_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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Percentage of participating employee's contribution, 100% matched by employer.

No definition available.

Name:	bby_PercentageOfParticipatingEmployeesContributionHundredPercentMatched
Namespace Prefix:	bby_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Commitment made to pay deferred cash remuneration expressed as a percentage of the individual's base salary.

No definition available.

Name:	us-gaap_DeferredCompensationArrangementWithIndividualCashAwardsGrantedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Amount of contributions made by employer into fund established for purposes of making future disbursement to individual in accordance with deferred compensation arrangement.

No definition available.

Name:	us-gaap_DeferredCompensationArrangementWithIndividualContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 55
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482943/710-10-55-7

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-SubTopic 10
-Topic 718
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Name:	us-gaap_DeferredCompensationArrangementWithIndividualRequisiteServicePeriod1
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Data Type:	xbrli:durationItemType
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Period Type:	duration

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

No definition available.