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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

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Namespace Prefix:	byd_
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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration