The percent of repurchase price of principal for certain conditions of a debt instrument.

No definition available.

Name:	byd_DebtInstrumentConditionalRepurchasePricePercentOfPrincipal
Namespace Prefix:	byd_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The minimum required coverage ratio for debt instrument covenant terms.

+ References

No definition available.

+ Details

Name:	byd_DebtInstrumentCovenantTermsMinimumRequiredCoverageRatio
Namespace Prefix:	byd_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

the percent of fixed quarterly amortization of a debt instrument.

+ References

No definition available.

+ Details

Name:	byd_DebtInstrumentFixedQuarterlyAmortizationOfPrincipalPercentage
Namespace Prefix:	byd_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The additional available borrowing capacity of a line of credit facility.

+ References

No definition available.

+ Details

Name:	byd_LineOfCreditFacilityAdditionalAvailableBorrowingCapacity
Namespace Prefix:	byd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The maximum secured leverage ratio allowed under line of credit facility covenant terms.

+ References

No definition available.

+ Details

Name:	byd_LineOfCreditFacilityCovenantTermsMaximumSecuredLeverageRatioAllowed
Namespace Prefix:	byd_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

The maximum total leverage ratio allowed under the covenant terms of the line of credit facility.

+ References

No definition available.

+ Details

Name:	byd_LineOfCreditFacilityCovenantTermsMaximumTotalLeverageRatioAllowed
Namespace Prefix:	byd_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

The minimum consolidated interest coverage ratio required under the line of credit facility covenant terms.

+ References

No definition available.

+ Details

Name:	byd_LineOfCreditFacilityCovenantTermsMinimumConsolidatedInterestCoverageRatioRequired
Namespace Prefix:	byd_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482900/835-30-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69C
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482925/835-30-45-2

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482949/835-30-55-8

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph e
-SubTopic 470
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480848/942-470-50-3

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482925/835-30-45-3

+ Details

Name:	us-gaap_DeferredFinanceCostsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DebtInstrumentAxis=byd_TermALoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=byd_AmendedCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=byd_RefinancingTermBLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=byd_BankCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=byd_BankCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=byd_SwingLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=byd_TermALoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=byd_SeniorNote4750Due2031Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=byd_In2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=byd_The4750SeniorNotesDueDecember2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=byd_In2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=byd_SeniorNote8625Due2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=byd_SeniorNotes6000Due2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=byd_SeniorNote6375Due2026Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=byd_In2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=byd_SeniorSecuredNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 7 - Long-term Debt (Details Textual) - USD ($) $ in Millions						12 Months Ended
	Jun. 01, 2022	Nov. 05, 2021	Jun. 09, 2021	Jun. 08, 2021	Dec. 03, 2019	Dec. 31, 2023	Dec. 31, 2022	Mar. 02, 2022
Debt Instrument, Face Amount						$ 17.1
Long-Term Line of Credit						$ 1,046.3	$ 1,187.8
Term A Loan [Member]
Debt Instrument, Face Amount								$ 880.0
Revolving Credit Facility [Member]
Line of Credit Facility Covenant Terms, Maximum Secured Leverage Ratio Allowed						3
Line of Credit Facility Covenant Terms, Minimum Consolidated Interest Coverage Ratio Required						2.5
Revolving Credit Facility [Member] \| Minimum [Member]
Line of Credit Facility, Covenant Terms, Maximum Total Leverage Ratio Allowed						4.5
Revolving Credit Facility [Member] \| Maximum [Member]
Line of Credit Facility, Covenant Terms, Maximum Total Leverage Ratio Allowed						5
Revolving Credit Facility [Member] \| Amended Credit Facility [Member]
Line of Credit Facility, Additional Available Borrowing Capacity						$ 1,000.0
Refinancing Term B Loans [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate						1.25%
Refinancing Term B Loans [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate						2.25%
Refinancing Term B Loans [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate						0.25%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage						0.20%
Refinancing Term B Loans [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument, Basis Spread on Variable Rate						1.25%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage						0.35%
Bank Credit Facility [Member] \| Fed Funds Effective Rate Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate						0.50%
Bank Credit Facility [Member] \| Eurodollar [Member]
Debt Instrument, Basis Spread on Variable Rate						1.00%
Bank Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity						$ 1,450.0
Line of Credit Facility, Remaining Borrowing Capacity						1,193.3
Bank Credit Facility [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity								$ 1,450.0
Long-Term Line of Credit						180.0
Bank Credit Facility [Member] \| Swing Loan [Member]
Long-Term Line of Credit						63.3
Bank Credit Facility [Member] \| Letter of Credit [Member]
Long-Term Line of Credit						13.4
Bank Credit Facility [Member] \| Line of Credit [Member]
Line of Credit Facility, Remaining Borrowing Capacity						$ 1,193.3
Term A Loan [Member]
Debt Instrument, Fixed Quarterly Amortization of Principal Percentage						5.00%
Senior Notes [Member] \| Senior Note 4750 Due 2031 Member
Debt Instrument, Face Amount				$ 900.0
Debt Instrument, Interest Rate, Stated Percentage				4.75%		4.75%	4.75%
Debt Issuance Costs, Gross				$ 13.5
Debt Instrument, Conditional Repurchase Price Percent of Principal				101.00%
Debt Instrument, Redemption Price, Percentage				100.00%
Senior Notes [Member] \| Senior Note 4750 Due 2031 Member \| In 2022 [Member]
Debt Instrument, Redemption Price, Percentage				104.75%
Senior Notes [Member] \| The 4.750% Senior NotesDue December 2027 [Member]
Debt Instrument, Face Amount					$ 1,000.0
Debt Instrument, Interest Rate, Stated Percentage					4.75%
Debt Issuance Costs, Gross					$ 15.7
Debt Instrument, Conditional Repurchase Price Percent of Principal					101.00%
Debt Instrument, Redemption Price, Percentage					100.00%
Senior Notes [Member] \| The 4.750% Senior NotesDue December 2027 [Member] \| In 2022 [Member]
Debt Instrument, Redemption Price, Percentage					102.375%
Senior Notes [Member] \| The 4.750% Senior NotesDue December 2027 [Member] \| In 2024 [Member]
Debt Instrument, Redemption Price, Percentage					100.00%
Senior Notes [Member] \| Senior Note 8.625% Due 2025 [Member]
Debt Instrument, Interest Rate, Stated Percentage		8.625%
Debt Instrument, Redemption Price, Percentage	104.313%
Extinguishment of Debt, Amount	$ 300.0	$ 300.0
Senior Notes [Member] \| Senior Notes 6.000% Due 2026 [Member]
Debt Instrument, Interest Rate, Stated Percentage			6.00%
Debt Instrument, Redemption Price, Percentage			103.993%
Extinguishment of Debt, Amount			$ 700.0
Senior Notes [Member] \| Senior Note 6.375% Due 2026 [Member]
Debt Instrument, Interest Rate, Stated Percentage			6.375%
Extinguishment of Debt, Amount			$ 750.0
Senior Notes [Member] \| Senior Note 6.375% Due 2026 [Member] \| In 2021 [Member]
Debt Instrument, Redemption Price, Percentage			103.188%
Senior Secured Notes [Member]
Debt Instrument Covenant Terms, Minimum Required Coverage Ratio						2