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Note 12 - Subsequent Events (Details Textual) - Subsequent Event [Member] $ in Millions	May 08, 2020 USD ($)	May 06, 2020 USD ($)
Revolving Credit Facility [Member] | Line of Credit [Member]
Debt Instrument, Covenant, Minimum Level of Liquidity	$ 250.0
Debt Instrument, Covenant, Total Net Leverage Ratio	6.00
Revolving Credit Facility and Term Loan A [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Debt Instrument, Interest Rate Floor	1.50%
Revolving Credit Facility and Term Loan A [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	2.75%
Debt Instrument, Interest Rate Floor	0.50%
Gold Merger Sub [Member] | Promissory Note [Member]
Notes Payable, Total		$ 57.7

X

- Definition

The minimum level of liquidity required under the covenant of the debt instrument.

+ References

No definition available.

+ Details

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

X

- Definition

The total net leverage ratio required under the covenant of the debt instrument.

+ References

No definition available.

+ Details

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X

- Definition

The interest rate floor of the debt instrument.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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- Details

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- Details

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