DEBT - Narrative (Details)								3 Months Ended	9 Months Ended
	Feb. 13, 2024 USD ($)	Feb. 05, 2021 USD ($) $ / shares	Feb. 05, 2021 USD ($) $ / shares	Feb. 05, 2021 USD ($) $ / shares	Feb. 05, 2021 USD ($) tradingDay $ / shares	Feb. 05, 2021 USD ($) businessDay $ / shares	Feb. 05, 2021 USD ($) shares $ / shares	Jun. 30, 2024 USD ($) shares	Jun. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($)	Jan. 13, 2023	Feb. 28, 2021 USD ($)	Feb. 02, 2021 $ / shares
Debt Instrument [Line Items]
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]								Convertible senior notes	Convertible senior notes
Spanish Government Agencies | HooYu
Debt Instrument [Line Items]
Debt interest rate (as a percent)								0.00%	0.00%
Amount outstanding under loan agreement								$ 2,300,000	$ 2,300,000	$ 1,300,000
Spanish Government Agencies | HooYu | Other current liabilities
Debt Instrument [Line Items]
Current loans payable								200,000	200,000	200,000
Spanish Government Agencies | HooYu | Other non-current liabilities
Debt Instrument [Line Items]
Noncurrent loans payable								$ 2,100,000	$ 2,100,000	1,100,000
Spanish Government Agencies | Minimum | HooYu
Debt Instrument [Line Items]
Term of loan agreement (in years)									5 years
Spanish Government Agencies | Maximum | HooYu
Debt Instrument [Line Items]
Term of loan agreement (in years)									12 years
Revolving Credit Facility
Debt Instrument [Line Items]
Unused revolving line facility fee (as a percent)	0.25%
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Debt issuance costs	$ 300,000
Maximum borrowing capacity	35,000,000
Additional value, line of credit facility, maximum borrowing capacity	15,000,000
Commitment fees	87,500
Indebtedness amount	$ 500,000
Maximum net leverage ratio								2.25	2.25
Maximum net leverage ratio if engaged in a share purchase program								2.00	2.00
Net leverage ratio								2.02	2.02
Carrying amount								$ 0	$ 0
Foreign Letter Of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Cash deposit, percentage	115.00%
2026 Notes | Significant Other Observable Inputs (Level 2)
Debt Instrument [Line Items]
Fair value								147,400,000	147,400,000
2026 Notes | Convertible Debt
Debt Instrument [Line Items]
Debt issued								$ 155,300,000	$ 155,300,000			$ 155,300,000
Debt interest rate (as a percent)		0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%	0.75%
Debt conversion ratio (per $1,000 principal amount)			0.0479731000
Debt conversion price (in dollars per share) | $ / shares		$ 20.85	$ 20.85	$ 20.85	$ 20.85	$ 20.85	$ 20.85
Conversion price premium percentage													37.50%
Proceeds from debt offerings, net of discounts, commissions and expenses				$ 149,700,000
Debt issuance costs		$ 5,500,000	$ 5,500,000	$ 5,500,000	$ 5,500,000	$ 5,500,000	$ 5,500,000
Remaining unamortized debt discount								$ 13,719,000	$ 13,719,000	19,734,000
Carrying amount								$ 141,531,000	$ 141,531,000	$ 135,516,000
2026 Notes | Convertible Debt | Common Stock
Debt Instrument [Line Items]
Share price (in dollars per share) | $ / shares													$ 15.16
2026 Notes | Convertible Debt | During any calendar quarter commencing after the calendar quarter ending on June 30, 2021
Debt Instrument [Line Items]
Debt conversion price percentage		130.00%	130.00%	130.00%	130.00%	130.00%	130.00%
Trading days in period (in days) | tradingDay					20
Consecutive trading days in period (in days) | tradingDay					30
2026 Notes | Convertible Debt | Measurement period
Debt Instrument [Line Items]
Debt conversion price percentage		98.00%	98.00%	98.00%	98.00%	98.00%	98.00%
Consecutive trading days in period (in days)					5	5
2026 Notes | Convertible Debt | Embedded Derivative Financial Instruments
Debt Instrument [Line Items]
Payment costs related to hedge transactions				$ 9,300,000
Embedded derivative, fair value of embedded derivative liability		$ 33,200,000	$ 33,200,000	33,200,000	$ 33,200,000	$ 33,200,000	$ 33,200,000
Value of remaining embedded derivative allocated to host contract		$ 116,500,000	116,500,000	116,500,000	116,500,000	116,500,000	116,500,000
Derivative interest rate								6.71%	6.71%
Remaining unamortized debt discount								$ 13,700,000	$ 13,700,000
Remaining debt discount amortization period (in years)									1 year 7 months 6 days
2026 Notes | Convertible Debt | Interest Rate Period One
Debt Instrument [Line Items]
Additional interest percentage											0.25%
Interest rate threshold period											90 days
2026 Notes | Convertible Debt | Interest Rate Period Two
Debt Instrument [Line Items]
Additional interest percentage											0.50%
Interest rate threshold period											180 days
Additional Notes | Convertible Debt
Debt Instrument [Line Items]
Option period to purchase additional notes (in days)		13 days
Additional aggregate principal amount purchased		$ 20,250,000	$ 20,250,000	$ 20,250,000	$ 20,250,000	$ 20,250,000	$ 20,250,000
Notes Hedge | Convertible Debt
Debt Instrument [Line Items]
Debt conversion price (in dollars per share) | $ / shares		$ 20.85	$ 20.85	$ 20.85	$ 20.85	$ 20.85	$ 20.85
Conversion price premium percentage													75.00%
Number of shares that can initially be converted into common stock (in shares) | shares							7,400,000
Strike price of warrants (in dollar per share) | $ / shares		$ 26.53	$ 26.53	$ 26.53	$ 26.53	$ 26.53	$ 26.53
Senior notes hedge balance		$ 33,200,000	$ 33,200,000	$ 33,200,000	$ 33,200,000	$ 33,200,000	$ 33,200,000
Shares purchased under the notes hedge (in shares) | shares									0
Increase in additional paid-in-capital for sale or warrants				$ 23,900,000
Warrants exercised (in shares) | shares									0
Warrants outstanding (in shares) | shares								0	0
Notes Hedge | Convertible Debt | Observation period
Debt Instrument [Line Items]
Consecutive trading days in period (in days) | tradingDay					80
Incremental dilution of earnings per share of warrants (in shares) | shares								0