SEGMENT INFORMATION (Operating information by segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024
Net revenue:
Net revenue	$ 148,413	$ 181,650	$ 476,523	$ 524,913
(Loss)/Income from operations:
(Loss)/Income from operations	(6,094)	8,277	(4,112)	(95,185)
Ball Bonding Equipment
Net revenue:
Net revenue	75,990	93,254	201,957	261,432
(Loss)/Income from operations:
(Loss)/Income from operations	23,480	27,751	56,203	80,617
Wedge Bonding Equipment
Net revenue:
Net revenue	22,126	26,144	90,546	72,364
(Loss)/Income from operations:
(Loss)/Income from operations	2,065	4,149	17,681	12,696
Advanced Solutions
Net revenue:
Net revenue	10,811	20,953	56,627	46,401
(Loss)/Income from operations:
(Loss)/Income from operations	(10,692)	(9,785)	61,753	(140,201)
APS
Net revenue:
Net revenue	36,448	38,059	113,354	119,967
(Loss)/Income from operations:
(Loss)/Income from operations	7,346	11,443	17,304	36,275
All others
Net revenue:
Net revenue	3,038	3,240	14,039	24,749
(Loss)/Income from operations:
(Loss)/Income from operations	(6,179)	(8,317)	(84,637)	(25,945)
Corporate Expenses
(Loss)/Income from operations:
(Loss)/Income from operations	$ (22,114)	$ (16,964)	$ (72,416)	$ (58,627)