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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($)
Number of Gaming Entertainment Properties, Open and Operating | 27 |  | 27 |
Number of Gaming Entertainment Properties | 28 |  | 28 |
Taxes, Other | $ 180.7 | $ 177.5 | $ 352.2 | $ 336.3
Taxes Deposited Pursuant to the Online Collaborative Agreements | $ 45.5 | $ 34.4 | $ 85.3 | $ 69.0

X
- Definition The number of gaming entertainment properties. + References No definition available. + Details
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Namespace Prefix: | byd_
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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
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Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount of tax expense classified as other. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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