SEGMENT INFORMATION (Operating information by segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 29, 2025	Mar. 30, 2024	Mar. 29, 2025	Mar. 30, 2024
Net revenue:
Net revenue	$ 161,986	$ 172,074	$ 328,110	$ 343,263
Income/(loss) from operations:
(Loss)/income from operations	(84,667)	(105,155)	1,982	(103,462)
Ball Bonding Equipment
Net revenue:
Net revenue	66,281	81,908	125,967	168,178
Income/(loss) from operations:
(Loss)/income from operations	19,295	25,152	32,723	52,866
Wedge Bonding Equipment
Net revenue:
Net revenue	36,197	22,761	68,420	46,220
Income/(loss) from operations:
(Loss)/income from operations	8,913	4,253	15,616	8,547
Advanced Solutions
Net revenue:
Net revenue	17,638	14,124	45,816	25,448
Income/(loss) from operations:
(Loss)/income from operations	(6,129)	(116,981)	72,445	(130,416)
APS
Net revenue:
Net revenue	37,520	40,667	76,906	81,908
Income/(loss) from operations:
(Loss)/income from operations	(1,297)	12,586	9,958	24,832
All Others
Net revenue:
Net revenue	4,350	12,614	11,001	21,509
Income/(loss) from operations:
(Loss)/income from operations	(75,246)	(9,554)	(78,458)	(17,628)
Corporate Expenses
Income/(loss) from operations:
(Loss)/income from operations	$ (30,203)	$ (20,611)	$ (50,302)	$ (41,663)