ACQUISITIONS - Narrative (Details) | | | | | | | | | | | | | | | 3 Months Ended | 12 Months Ended | |
Mar. 31, 2022 USD ($) | Oct. 25, 2021 USD ($) | Oct. 01, 2021 USD ($) | Aug. 12, 2021 USD ($) | Jul. 12, 2021 USD ($) | Jun. 14, 2021 USD ($) | Jun. 03, 2021 USD ($) | Jun. 01, 2021 USD ($) shares | May 28, 2021 USD ($) | Apr. 13, 2021 USD ($) | Apr. 06, 2021 USD ($) | Mar. 23, 2021 USD ($) shares | Feb. 05, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Jan. 22, 2021 shares |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Total consideration paid, net of cash acquired | | | | | | | | | | | | | | | $ 0 | | $ 22,745,000 | | |
Transaction costs | | | | | | | | | | | | | | | 4,482,000 | | 12,258,000 | | |
Change in contingent consideration payable | | | | | | | | | | | | | | | (5,859,000) | | (3,142,000) | | |
Goodwill | $ 2,082,632,000 | | | | | | | | | | | | | | 2,082,632,000 | $ 2,122,653,000 | | $ 2,122,653,000 | |
Additions | | | | | | | | | | | | | | | 798,000 | | 0 | | |
International Interactive | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Goodwill | 1,597,594,000 | | | | | | | | | | | | | | 1,597,594,000 | 1,637,343,000 | | 1,637,343,000 | |
North America Interactive | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Goodwill | $ 283,086,000 | | | | | | | | | | | | | | $ 283,086,000 | 283,358,000 | | 283,358,000 | |
Telescope | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Ownership percentage by noncontrolling owners | | | | 15.84% | | | | | | | | | | | | | | | |
Tropicana Evansville | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Renewal term (in years) | 5 years | | | | | | | | | | | | | | 5 years | | | | |
Gamesys | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Total consideration paid | $ 2,599,117,000 | | $ 2,599,117,000 | | | | | | | | | | | | | | | | |
Total consideration paid, net of cash acquired | | | 1,900,000,000 | | | | | | | | | | | | | | | | |
Transaction costs | | | | | | | | | | | | | | | $ 378,000 | | 6,227,000 | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 1,513,023,000 | | 1,513,023,000 | | | | | | | | | | | | 1,513,023,000 | | | | |
YTD Adjustment, Consideration Transferred | | | | | | | | | | | | | | | 0 | | | | |
Consideration paid in cash | | | 2,080,000,000 | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 183,306,000 | | 183,306,000 | | | | | | | | | | | | 183,306,000 | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 35,851,000 | | 35,851,000 | | | | | | | | | | | | 35,851,000 | | | | |
Business Combination, Post Combination Expense | | | | | | | | | | | | | | | | 10,300,000 | | | |
Goodwill | 1,677,934,000 | | 1,678,476,000 | | | | | | | | | | | | 1,677,934,000 | | | | |
Business Combination, Consideration Transferred, Other | | | 36,400,000 | | | | | | | | | | | | | | | | |
Gamesys | International Interactive | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Goodwill | | | 1,640,000,000 | | | | | | | | | | | | | | | | |
Gamesys | North America Interactive | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Goodwill | | | 33,300,000 | | | | | | | | | | | | | | | | |
Gamesys | Customer relationships | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | | | 980,200,000 | | | | | | | | | | | | | | | | |
Gamesys | Developed Software | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | | | $ 282,000,000 | | | | | | | | | | | | | | | | |
Finite-Lived Intangible Asset, Useful Life | | | 7 years | | | | | | | | | | | | | | | | |
Gamesys | Tradename | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | | | $ 249,800,000 | | | | | | | | | | | | | | | | |
Tropicana Las Vegas Hotel and Casino | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Total consideration paid | | | | | | | | | | $ 300,000,000 | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings And Equipment | | | | | | | | | | $ 150,000,000 | | | | | | | | | |
Term of contract (in years) | | | | | | | | | | 50 years | | | | | | | | | |
Annual rent | | | | | | | | | | $ 10,500,000 | | | | | | | | | |
Jumer's | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Total consideration paid | | | | | | $ 118,900,000 | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 31,180,000 | | | | | | | | | | | | | | 31,180,000 | | | | |
Business Combination, Net Working Capital Liability | | | | | | 112,000,000 | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 118,928,000 | | | | | | | | | | | | | | 118,928,000 | | | | |
Other Payments to Acquire Businesses | | | | | | | | | | | | | | $ (4,000,000) | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 2,933,000 | | | | | 2,900,000 | | | | | | | | | 2,933,000 | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 2,986,000 | | | | | | | | | | | | | | 2,986,000 | | | | |
Goodwill | 14,593,000 | | | | | | | | | | | | | | 14,593,000 | | | | |
Jumer's | License [Member] | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | | | | | | 30,300,000 | | | | | | | | | | | | | |
Jumer's | Customer relationships | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | | | | | | $ 700,000 | | | | | | | | | | | | | |
Acquired intangible assets, useful life | | | | | | 9 years | | | | | | | | | | | | | |
Jumer's | Tradename | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | | | | | | $ 200,000 | | | | | | | | | | | | | |
Acquired intangible assets, useful life | | | | | | 4 months | | | | | | | | | | | | | |
Tropicana Evansville | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Total consideration paid | | | | | | | $ 139,700,000 | | | | | | | | | | | | |
Total consideration paid, net of cash acquired | | | | | | | 130,400,000 | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 154,210,000 | | | | | | | | | | | | | | 154,210,000 | | | | |
Business Combination, Bargain Purchase, Gain Recognized, Amount | | | | | | | | | | | | | | | 20,856,000 | | | 20,900,000 | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 139,708,000 | | | | | | | | | | | | | | 139,708,000 | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 9,355,000 | | | | | | 9,400,000 | | | | | | | | 9,355,000 | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 1,474,000 | | | | | | | | | | | | | | 1,474,000 | | | | |
Tropicana Evansville | Dover Downs Real Estate | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Property, Plant and Equipment, Disposals | | | | | | | $ 144,000,000 | | | | | | | | | | | | |
Tropicana Evansville | Tropicana Evansville | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Term of contract (in years) | | | | | | | 15 years | | | | | | | | | | | | |
Tropicana Evansville | Dover Downs Real Estate | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Number of renewal terms | | | | | | | 4 | | | | | | | | | | | | |
Tropicana Evansville | GLPI | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Property, Plant and Equipment, Additions | | | | | | | $ 340,000,000 | | | | | | | | | | | | |
Tropicana Evansville | License [Member] | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | | | | | | | 153,600,000 | | | | | | | | | | | | |
Tropicana Evansville | Customer relationships | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | | | | | | | $ 600,000 | | | | | | | | | | | | |
Acquired intangible assets, useful life | | | | | | | 8 years | | | | | | | | | | | | |
Dover Downs Real Estate | Dover Downs Real Estate | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Term of contract (in years) | | | | | | | 15 years | | | | | | | | | | | | |
Bet.Works | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Total consideration paid | | | | | | | | | $ 192,100,000 | | | | | | | | | | |
Stock issued for equity purchase (in shares) | shares | | | | | | | | 2,084,765 | | | | | | | | | | | |
Payments of Capital Distribution | | | | | | | | $ 70,400,000 | | | | | | | | | | | |
MontBleu Only | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Total consideration paid | | | | | | | | | | | $ 14,200,000 | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 5,430,000 | | | | | | | | | | | | | | 5,430,000 | 5,430,000 | | 5,430,000 | |
YTD Adjustment, Consideration Transferred | | | | | | | | | | | | | | | 0 | | | | |
Business Combination, Bargain Purchase, Gain Recognized, Amount | | | | | | | | | | | 2,049,000 | | | | 1,942,000 | | | 2,000,000 | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | $ 14,172,000 | | | | | | | | | | | | | | $ 14,172,000 | $ 14,172,000 | | $ 14,172,000 | |
MontBleu Only | License [Member] | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | | | | | | | | | | | $ 5,200,000 | | | | | | | | |
MontBleu Only | Customer relationships | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Acquired intangible assets, useful life | | | | | | | | | | | 6 months | | | | | | | | |
MontBleu Only | Tradename | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | | | | | | | | | | | $ 200,000 | | | | | | | | |
Monkey Knife Fight | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Total consideration paid | | | | | | | | | | | | $ 118,600,000 | | | | | | | |
Monkey Knife Fight | Penny Warrant | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Common stock available to acquire (in shares) | shares | | | | | | | | | | | | | | | | | | | 984,446 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | shares | | | | | | | | | | | | 787,557 | | | | | | | |
Horses Mouth Limited (SportCaller) | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Total consideration paid | | | | | | | | | | | | | $ 42,600,000 | | | | | | |
Consideration paid in cash | | | | | | | | | | | | | $ 24,000,000 | | | | | | |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Shares | shares | | | | | | | | | | | | | 221,391 | | | | | | |
Total fair value of Dover Downs stock purchased | | | | | | | | | | | | | $ 12,000,000 | | | | | | |
Conversion rate | 1.1126 | | | | | | | | | | | | 0.8334 | | 1.1126 | | | | |
SportCaller and MKF | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Total consideration paid, net of cash acquired | | | | | | | | | | | | | | | $ 22,400,000 | | | | |
Transaction costs | | | | | | | | | | | | | | | 464,000 | | $ 2,840,000 | | |
Contingent Consideration Asset, Fair Value Disclosure | $ 58,700,000 | | | | | | | | | | | | | | 58,700,000 | | | | |
Business Combination, Non-cash Consideration Transferred | | | | | | | | | | | | | | | 135,300,000 | | | | |
Bally’s Interactive Acquisitions | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 167,075,000 | | | | | | | | | | | | | | 167,075,000 | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 8,689,000 | | | | | | | | | | | | | | 8,689,000 | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 4,498,000 | | | | | | | | | | | | | | 4,498,000 | | | | |
Goodwill | $ 250,491,000 | | | | | | | | | | | $ 250,500,000 | | | $ 250,491,000 | | | | |
Bally’s Interactive Acquisitions | Customer relationships | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | | | | | | | | | | | | 41,500,000 | | | | | | | |
Bally’s Interactive Acquisitions | Customer relationships | Minimum | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Acquired intangible assets, useful life | | | | | | | | | | | | | | | 3 years | | | | |
Bally’s Interactive Acquisitions | Customer relationships | Maximum | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Acquired intangible assets, useful life | | | | | | | | | | | | | | | 10 years | | | | |
Bally’s Interactive Acquisitions | Developed Software | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | | | | | | | | | | | | 122,400,000 | | | | | | | |
Bally’s Interactive Acquisitions | Developed Software | Minimum | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Acquired intangible assets, useful life | | | | | | | | | | | | | | | 3 years | | | | |
Bally’s Interactive Acquisitions | Developed Software | Maximum | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Acquired intangible assets, useful life | | | | | | | | | | | | | | | 10 years | | | | |
Bally’s Interactive Acquisitions | Tradename | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | | | | | | | | | | | | $ 3,100,000 | | | | | | | |
Bally’s Interactive Acquisitions | Tradename | Minimum | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Acquired intangible assets, useful life | | | | | | | | | | | | | | | 10 years | | | | |
Bally’s Interactive Acquisitions | Tradename | Maximum | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Acquired intangible assets, useful life | | | | | | | | | | | | | | | 15 years | | | | |
AVP | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Total consideration paid | | | | | $ 10,000,000 | | | | | | | | | | | | | | |
Telescope | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Total consideration paid | | | | $ 25,900,000 | | | | | | | | | | | | | | | |
Percentage of voting interests acquired | | | | 84.16% | | | | | | | | | | | | | | | |
Degree 53 | | | | | | | | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | | | | | | | | |
Total consideration paid | | $ 7,800,000 | | | | | | | | | | | | | | | | | |