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v3.21.2

Note 1 - Summary of Significant Accounting Policies - Schedule of Promotional Allowances (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Food and Beverage [Member] |  |  |  |
Promotional allowance | $ 26,380 | $ 20,055 | $ 75,284 | $ 69,470
Occupancy [Member] |  |  |  |
Promotional allowance | 15,721 | 12,007 | 43,970 | 34,162
Product and Service, Other [Member] |  |  |  |
Promotional allowance | $ 1,904 | $ 1,211 | $ 4,469 | $ 4,265

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: |