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v3.19.3

Note 1 - Summary of Significant Accounting Policies - Schedule of Promotional Allowances (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Food and Beverage [Member] |  |  |  |
Promotional allowance | $ 52,924 | $ 43,599 | $ 159,966 | $ 129,522
Occupancy [Member] |  |  |  |
Promotional allowance | 24,482 | 19,437 | 71,798 | 58,298
Product and Service, Other [Member] |  |  |  |
Promotional allowance | $ 3,753 | $ 3,061 | $ 10,983 | $ 8,389

X
- Definition This element represents the estimated retail value of accommodations, food and beverage, and other services furnished to guests without charge. + References No definition available. + Details
Name: | byd_PromotionalAllowance
Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_FoodAndBeverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_OccupancyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_ProductAndServiceOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |