XML 108 R92.htm IDEA: XBRL DOCUMENT v3.20.4

Note 11 - Stockholders' Equity and Stock Incentive Plans - Stock Options Outstanding Exercisable (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Options outstanding, number outstanding (in shares) | shares	645,348
Options outstanding, weighted average remaining contractual life (Year)	4 years 2 months 12 days
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 14.07
Options exercisable, number exercisable (in shares) | shares	645,348
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 14.07
Range One [Member]
Options outstanding, number outstanding (in shares) | shares	25,510
Options outstanding, weighted average remaining contractual life (Year)	1 year 10 months 24 days
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 5.22
Options exercisable, number exercisable (in shares) | shares	25,510
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 5.22
Range Four [Member]
Options outstanding, number outstanding (in shares) | shares	202,068
Options outstanding, weighted average remaining contractual life (Year)	2 years 10 months 24 days
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 9.86
Options exercisable, number exercisable (in shares) | shares	202,068
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 9.86
Range Five [Member]
Options outstanding, number outstanding (in shares) | shares	123,849
Options outstanding, weighted average remaining contractual life (Year)	3 years 10 months 24 days
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 11.57
Options exercisable, number exercisable (in shares) | shares	123,849
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 11.57
Range Six [Member]
Options outstanding, number outstanding (in shares) | shares	157,895
Options outstanding, weighted average remaining contractual life (Year)	5 years 10 months 24 days
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 17.75
Options exercisable, number exercisable (in shares) | shares	157,895
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 17.75
Range 7 [Member]
Options outstanding, number outstanding (in shares) | shares	136,026
Options outstanding, weighted average remaining contractual life (Year)	4 years 9 months 18 days
Options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 19.98
Options exercisable, number exercisable (in shares) | shares	136,026
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 19.98

X

- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=byd_RangeOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=byd_RangeFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=byd_RangeFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=byd_RangeSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=byd_Range7Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: