BUSINESS COMBINATIONS - Narrative (Details) $ in Thousands, $ in Millions						3 Months Ended						12 Months Ended
	May 01, 2023 USD ($)	Oct. 14, 2022 USD ($)	Apr. 30, 2022 USD ($)	Mar. 01, 2022 USD ($)	Mar. 01, 2022 AUD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2022 AUD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Consideration transferred												$ 200
Deferred tax liabilities, net						$ 13,762						13,762	$ 5,994
Pro forma revenue												817,000	824,000
Pro forma net income												$ 83,000	109,200
ecash Holdings Pty Limited
Business Acquisition [Line Items]
Payments to acquire businesses, gross				$ 15,000	$ 20.0
Payments for excess net working capital										$ 6,000	$ 8.7
Deferred taxes									$ 2,300
ecash Holdings Pty Limited | Tranche One
Business Acquisition [Line Items]
Contingent consideration				$ 3,400	$ 5.0
Contingent consideration, period since closing				1 year	1 year
ecash Holdings Pty Limited | Tranche Two
Business Acquisition [Line Items]
Contingent consideration					$ 6.5
Contingent consideration, period since closing				2 years	2 years
Intuicode
Business Acquisition [Line Items]
Payments to acquire businesses, gross			$ 12,500
Business combination, consideration transferred, liabilities incurred										$ 1,600
Consideration transferred								$ 1,300
Intuicode | Measurement Input, Discount Rate
Business Acquisition [Line Items]
Acquired business discount rate						0.05						0.05
Intuicode | Revenue Target One
Business Acquisition [Line Items]
Earn-out liability			$ 6,400
Contingent consideration, revenue target anniversary			1 year
Intuicode | Revenue Target Two
Business Acquisition [Line Items]
Earn-out liability			$ 2,600
Contingent consideration, revenue target anniversary			2 years
Operating expenses						$ 1,700
Venuetize, Inc.
Business Acquisition [Line Items]
Payments to acquire businesses, gross		$ 18,200
Earn-out liability		1,800
Business combination, consideration transferred		$ 1,000
Deferred tax liabilities, net						1,200						$ 1,200
Cash payments, noncurrent, payment period		2 years
Venuetize, Inc. | Measurement Input, Discount Rate
Business Acquisition [Line Items]
Acquired business discount rate		0.07
Venuetize, Inc. | Revenue Target One
Business Acquisition [Line Items]
Contingent consideration, revenue target anniversary		12 months
Venuetize, Inc. | Revenue Target Two
Business Acquisition [Line Items]
Contingent consideration, revenue target anniversary												24 months
Venuetize, Inc. | Revenue Target Three
Business Acquisition [Line Items]
Contingent consideration, revenue target anniversary												30 months
VKGS LLC
Business Acquisition [Line Items]
Payments to acquire businesses, gross	$ 61,013
Business combination, consideration transferred, liabilities incurred	466
Earn-out liability	$ 200
Contingent consideration, revenue target anniversary	18 months
Business combination, consideration transferred	$ 61,479
Additional net Working capital payment							$ 300
Cash						1,900						$ 1,900
Travel receivables						2,000						2,000
Inventory						$ 3,400						3,400
Other intangible assets	25,770
Revenue since acquisition date												18,400
Net loss since acquisition date												3,600
Transaction costs												$ 600
VKGS LLC | Customer relationships
Business Acquisition [Line Items]
Other intangible assets	17,520
VKGS LLC | Developed technology
Business Acquisition [Line Items]
Other intangible assets	7,300
VKGS LLC | Trade name
Business Acquisition [Line Items]
Other intangible assets	$ 950
VKGS LLC | Measurement Input, Discount Rate | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangible assets acquired, measurement input	14.00%
VKGS LLC | Measurement Input, Discount Rate | Developed technology
Business Acquisition [Line Items]
Finite-lived intangible assets acquired, measurement input	14.00%
VKGS LLC | Measurement Input, Discount Rate | Trade name
Business Acquisition [Line Items]
Finite-lived intangible assets acquired, measurement input	15.00%
VKGS LLC | Measurement Input, Royalty Rate | Developed technology
Business Acquisition [Line Items]
Finite-lived intangible assets acquired, measurement input	10.00%
VKGS LLC | Measurement Input, Royalty Rate | Trade name
Business Acquisition [Line Items]
Finite-lived intangible assets acquired, measurement input	1.00%
eCash, Intuicode and Venuetize
Business Acquisition [Line Items]
Pro forma revenue													797,600
Pro forma net income													$ 111,400