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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Number of Gaming Entertainment Properties, Open and Operating | 27 |  | 27 |
Number of Gaming Entertainment Properties | 28 |  | 28 |
Taxes, Other | $ 175.3 | $ 162.2 | $ 527.5 | $ 498.6
Taxes Deposited Pursuant to the Online Collaborative Agreements | $ 44.5 | $ 29.1 | $ 129.8 | $ 98.1

X
- Definition The number of gaming entertainment properties. + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents number of gaming entertainment properties open and operating. + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of tax expense classified as taxes deposited pursuant to the online collaborative agreements. + References No definition available. + Details
Name: | byd_TaxesDepositedPursuantToTheOnlineCollaborativeAgreements
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of tax expense classified as other. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration