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Note 1 - Summary of Significant Accounting Policies - Property, Plant and Equipment, Useful Life (Details)	12 Months Ended
	Dec. 31, 2020
Building and Building Improvements [Member] | Minimum [Member]
Property, plant and equipment, useful life (Year)	3 years
Building and Building Improvements [Member] | Maximum [Member]
Property, plant and equipment, useful life (Year)	40 years
Riverboats And Barges [Member] | Minimum [Member]
Property, plant and equipment, useful life (Year)	5 years
Riverboats And Barges [Member] | Maximum [Member]
Property, plant and equipment, useful life (Year)	40 years
Furniture and Equipment [Member] | Minimum [Member]
Property, plant and equipment, useful life (Year)	1 year
Furniture and Equipment [Member] | Maximum [Member]
Property, plant and equipment, useful life (Year)	12 years

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=byd_RiverboatsAndBargesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=byd_FurnitureAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: