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Note 1 - Summary of Significant Accounting Policies - Self-insurance Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Beginning balance, January 1,	$ 37,492	$ 42,563	$ 45,436
Charged to costs and expenses	68,981	81,249	88,806
Payments made	(72,616)	(86,320)	(91,679)
Ending balance, December 31,	$ 33,857	$ 37,492	$ 42,563

X

- Definition

The amount of decrease in self insurance reserve due to payments made.

+ References

No definition available.

+ Details

Name:	byd_SelfInsuranceReserveDecreasesFromPaymentsMade
Namespace Prefix:	byd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of increase in self insurance reserve due to charges.

+ References

No definition available.

+ Details

Name:	byd_SelfInsuranceReserveIncreaseDueToCharges
Namespace Prefix:	byd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

+ 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 210.5-02.24)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

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