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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

Name:	byd_NumberOfGamingEntertainmentPropertiesOpenAndOperating
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

Name:	us-gaap_TaxesOther
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration