XML 58 R49.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Stockholders' Equity and Stock Incentive Plans Dividends (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2018 | Sep. 30, 2017
Dividends, Share-based Payments [Abstract] |  |
Dividends, Share-based Compensation | $ 0.05 | $ 0.05

X
- Definition Dividends, Share-based Payments [Abstract] + References No definition available. + Details
Name: | byd_DividendsSharebasedPaymentsAbstract
Namespace Prefix: | byd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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