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ACQUISITIONS - Narrative (Details)															3 Months Ended			6 Months Ended
	Mar. 31, 2022 USD ($)	Oct. 25, 2021 USD ($)	Oct. 01, 2021 USD ($) shares	Aug. 12, 2021 USD ($)	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 ($) shares	Sep. 30, 2020 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jan. 22, 2021 shares
Business Acquisition [Line Items]
Total consideration paid, net of cash acquired																		$ 0	$ 332,029,000
Transaction costs															$ 8,476,000		$ 18,402,000	12,958,000	30,660,000
Change in contingent consideration payable																		(10,175,000)	(11,703,000)
Goodwill															1,970,058,000			1,970,058,000		$ 2,122,653,000
Additions															1,636,000		0	2,434,000	0
International Interactive
Business Acquisition [Line Items]
Goodwill															1,487,017,000			1,487,017,000		1,637,343,000
North America Interactive
Business Acquisition [Line Items]
Goodwill															$ 282,374,000			$ 282,374,000		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															$ 800,000		7,344,000	$ 1,178,000	13,571,000
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			2,080,000,000.00
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			1,678,476,000												1,677,934,000			1,677,934,000
Business Combination, Consideration Transferred, Other			$ 36,400,000
Number of shares acquired (in shares) | shares			9,773,537
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		31,180,000
Business Combination, Net Working Capital Liability						112,000,000
YTD Adjustment, Consideration Transferred																0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net															118,928,000			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						2,900,000									2,933,000			2,933,000		2,933,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables															2,986,000			2,986,000		2,986,000
Goodwill															13,308,000			13,308,000		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																20,900,000		20,856,000
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							9,400,000								9,355,000			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
YTD Adjustment, Consideration Transferred																		0
Business Combination, Bargain Purchase, Gain Recognized, Amount															1,900,000	$ 2,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net															$ 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													0.8334		1.0487			1.0487
SportCaller and MKF
Business Acquisition [Line Items]
Total consideration paid, net of cash acquired																		$ 22,400,000
Transaction costs															$ 1,883,000		$ 834,000	2,347,000	$ 3,674,000
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												$ 250,700,000			$ 250,730,000			$ 250,730,000
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

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