XML 44 R32.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Organization and Basis of Presentation (Details) - property | 3 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jan. 31, 2010
Consolidated Entities [Line Items] |  |
Number of gaming entertainment properties | 24 |
Subsidiary, Borgata |  |
Consolidated Entities [Line Items] |  |
Equity Method Investment, Ownership Percentage |  | 50.00%

X
- Definition Consolidated Entities [Line Items] + References No definition available. + Details
Name: | byd_ConsolidatedEntitiesLineItems
Namespace Prefix: | byd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Gaming Entertainment Properties + References No definition available. + Details
Name: | byd_NumberOfGamingEntertainmentProperties
Namespace Prefix: | byd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=byd_SubsidiaryBorgataMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |