DEBT - Narrative (Details)			8 Months Ended	12 Months Ended
	Feb. 13, 2024 USD ($)	Feb. 05, 2021 USD ($) patent $ / shares	Sep. 30, 2021 USD ($)	Sep. 30, 2024 USD ($) shares	Dec. 31, 2017	May 13, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jan. 13, 2023	Feb. 28, 2021 USD ($)	Feb. 02, 2021 $ / shares
Debt Instrument [Line Items]
Fair value				$ 146,900,000			$ 135,400,000
Derivative Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]				Convertible senior notes
Amount authorized under share repurchase program						$ 50,000,000
Outstanding borrowings				$ 2,697,000
Spanish Government Agencies | ICAR Vision Systems, S.L.
Debt Instrument [Line Items]
Debt interest rate (as a percent)				0.00%	0.00%
Amount outstanding under loan agreement				$ 2,700,000			1,200,000
Spanish Government Agencies | ICAR Vision Systems, S.L. | Minimum
Debt Instrument [Line Items]
Repayment period of loan agreements				5 years	5 years
Spanish Government Agencies | ICAR Vision Systems, S.L. | Maximum
Debt Instrument [Line Items]
Repayment period of loan agreements				12 years	12 years
Spanish Government Agencies | ICAR Vision Systems, S.L. | Other Current Liabilities
Debt Instrument [Line Items]
Current loans payable				$ 300,000			200,000
Spanish Government Agencies | ICAR Vision Systems, S.L. | Other Noncurrent Liabilities
Debt Instrument [Line Items]
Noncurrent loans payable				2,400,000			1,100,000
Revolving Credit Facility
Debt Instrument [Line Items]
Unused revolving line facility fee (as a percent)	0.25%
Convertible Debt | 2026 Notes
Debt Instrument [Line Items]
Debt issued				$ 155,300,000					$ 155,300,000
Debt interest rate (as a percent)		0.75%		0.75%
Debt conversion ratio (per $1,000 principal amount)		0.0479731000
Debt conversion price (in dollars per share) | $ / shares		$ 20.85
Conversion price premium percentage										0.375
Proceeds from debt offerings, net of discounts, commissions and expenses		$ 149,700,000
Debt issuance costs		$ 5,500,000
Remaining unamortized debt discount				$ 11,649,000			19,734,000
Outstanding borrowings				143,601,000			$ 135,516,000
Convertible Debt | 2026 Notes | Interest Rate Period One
Debt Instrument [Line Items]
Additional interest (as a percent)								0.25%
Interest rate threshold period								90 days
Convertible Debt | 2026 Notes | Interest Rate Period Two
Debt Instrument [Line Items]
Additional interest (as a percent)								0.50%
Interest rate threshold period								180 days
Convertible Debt | 2026 Notes | Common Stock
Debt Instrument [Line Items]
Share price (in dollars per share) | $ / shares										$ 15.16
Convertible Debt | 2026 Notes | During any Calendar Quarter Commencing after the Calendar Quarter Ending on June 30, 2021
Debt Instrument [Line Items]
Debt conversion price percentage		1.30
Trading days in period | patent		20
Consecutive trading days in period | patent		30
Convertible Debt | 2026 Notes | Measurement Period
Debt Instrument [Line Items]
Debt conversion price percentage		0.98
Consecutive trading days in period | patent		5
Convertible Debt | 2026 Notes | Embedded Conversion Derivative
Debt Instrument [Line Items]
Payment costs related to hedge transactions		$ 9,300,000
Embedded derivative, fair value of embedded derivative liability		33,200,000
Value of remaining embedded derivative allocated to host contract		$ 116,500,000
Derivative interest rate		6.71%
Remaining unamortized debt discount				$ 11,600,000
Remaining debt discount amortization period				1 year 3 months 18 days
Convertible Debt | Additional Notes
Debt Instrument [Line Items]
Option period to purchase additional notes		13 days
Additional aggregate principal amount purchased		$ 20,300,000
Convertible Debt | Notes Hedge
Debt Instrument [Line Items]
Debt conversion price (in dollars per share) | $ / shares		$ 20.85
Conversion price premium percentage										0.750
Number of shares that can initially be converted into common stock | patent		7,400,000
Strike price of warrants (in dollar per share) | $ / shares		$ 26.53
Senior notes hedge balance		$ 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
Convertible Debt | Notes Hedge | Observation Period
Debt Instrument [Line Items]
Consecutive trading days in period | patent		80
Incremental dilution of earnings per share of warrants (in shares) | shares				0
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
Maximum net leverage ratio if engaged in a share purchase program				2.00
Net leverage ratio				1.80
Outstanding borrowings				$ 0
Foreign Letter Of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Cash deposit, percentage	115.00%