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Note 7 - Stockholders' Equity and Stock Incentive Plans - Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Shares repurchased (1) (in shares) | [1] | 0 | 11 | 683 | 1,087
Total cost, including brokerage fees |  | $ 0 | $ 284 | $ 11,121 | $ 28,044
Average repurchase price per share (2) (in dollars per share) | [2] | $ 0 | $ 25.01 | $ 16.29 | $ 25.81
[1] | All shares repurchased have been retired and constitute authorized but unissued shares.
[2] | Amounts in the table may not recalculate exactly due to rounding. Average repurchase price per share is calculated based on unrounded numbers.

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- Definition Average repurchase price per share under the share repurchase program. + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Equity impact of the value of stock that has been repurchased and retired during the period, including fees. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References No definition available. + Details
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Namespace Prefix: | byd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration