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Note 15 - Related Party Transactions (Details Textual)	Dec. 31, 2022
William S. Boyd and His Immediate Family [Member]
Ownership Percentage	27.00%

X

- Definition

Percentage of ownership in the company.

+ References

No definition available.

+ Details

Name:	byd_OwnershipPercentage
Namespace Prefix:	byd_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=byd_WilliamSBoydAndHisImmediateFamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: