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Note 6 - Commitments and Contingencies (Details Textual) $ in Millions	Mar. 28, 2022 USD ($)
Pala Interactive LLC [Member]
Business Combination, Price of Acquisition, Expected	$ 170

X

- Definition

Purchase price of expected business acquisition prior to consideration being transferred. Excludes asset acquisition.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 15
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=116873391&loc=d3e405-128459

+ Details

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

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=byd_PalaInteractiveLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: