STOCKHOLDERS' EQUITY AND STOCK-BASED COMPENSATION - Future Expense, by Award Type (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Share-based compensation
Expected future expense	$ 138,299
2024
Share-based compensation
Expected future expense	37,752
2025
Share-based compensation
Expected future expense	74,172
2026
Share-based compensation
Expected future expense	25,488
2027
Share-based compensation
Expected future expense	887
Stock options
Share-based compensation
Share-based compensation not yet recognized	272
Stock options | 2024
Share-based compensation
Share-based compensation not yet recognized	182
Stock options | 2025
Share-based compensation
Share-based compensation not yet recognized	90
Stock options | 2026
Share-based compensation
Share-based compensation not yet recognized	0
Stock options | 2027
Share-based compensation
Share-based compensation not yet recognized	0
Restricted stock units
Share-based compensation
Future share-based compensation expense expected	137,801
Restricted stock units | 2024
Share-based compensation
Future share-based compensation expense expected	37,344
Restricted stock units | 2025
Share-based compensation
Future share-based compensation expense expected	74,082
Restricted stock units | 2026
Share-based compensation
Future share-based compensation expense expected	25,488
Restricted stock units | 2027
Share-based compensation
Future share-based compensation expense expected	887
Employee stock purchase plan
Share-based compensation
Future share-based compensation expense expected	226
Expected future expense	200
Employee stock purchase plan | 2024
Share-based compensation
Future share-based compensation expense expected	226
Employee stock purchase plan | 2025
Share-based compensation
Future share-based compensation expense expected	0
Employee stock purchase plan | 2026
Share-based compensation
Future share-based compensation expense expected	0
Employee stock purchase plan | 2027
Share-based compensation
Future share-based compensation expense expected	$ 0