EQUITY, STOCK-BASED COMPENSATION AND EARNINGS (LOSS) PER SHARE - Basic and diluted net loss per share (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 27, 2021	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Numerator:
Consolidated net loss		$ (17,577)	$ (26,087)	$ (60,073)	$ (89,994)
Less: Net loss attributable to noncontrolling interests		0	0	0	(440)
Net loss attributable to common shareholders		$ (17,577)	$ (26,087)	$ (60,073)	$ (89,554)
Denominator:
Weighted-average shares outstanding - Basic (in shares)		34,353,000	25,993,000	31,811,000	25,862,000
Weighted-average shares outstanding - Diluted (in shares)		34,353,000	25,993,000	31,811,000	25,862,000
Shares excluded in computing of earnings (in shares)		10,712,000	5,451,000	10,712,000	5,451,000
Convertible notes
Denominator:
Shares excluded in computing of earnings (in shares)	3,040,268			2,859,306	3,040,268
Warrants
Denominator:
Shares excluded in computing of earnings (in shares)				3,034,124