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

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- 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

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