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Stockholders' Equity and Stock Incentive Plans Dividends (Details) - USD ($) | 3 Months Ended
--- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017
Dividends Paid [Abstract] |  |  |
Dividends, Share-based Compensation | $ 0.05 | $ 0.05 | $ 0.05

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- Definition Dividends Paid [Abstract] + References No definition available. + Details
Name: | byd_DividendsPaidAbstract
Namespace Prefix: | byd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units. + References No definition available. + Details
Name: | us-gaap_DividendsShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration