SEGMENT INFORMATION (Operating information by segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014	Mar. 30, 2013
Net revenue:
Net revenue	$ 114,206	$ 106,110	$ 193,319	$ 220,149
Cost of sales :
Cost of sales	56,534	57,290	97,282	119,804
Gross profit :
Gross profit	57,672	48,820	96,037	100,345
Operating expenses:
Operating expenses	47,561	40,630	88,134	87,950
Income from operations:
Income from operations	10,111	8,190	7,903	12,395
Equipment [Member]
Net revenue:
Net revenue	97,612	91,083	160,757	190,985
Cost of sales :
Cost of sales	50,711	51,140	85,184	107,572
Gross profit :
Gross profit	46,901	39,943	75,573	83,413
Operating expenses:
Operating expenses	41,608	35,515	77,160	77,240
Income from operations:
Income from operations	5,293	4,428	(1,587)	6,173
Expendable Tools [Member]
Net revenue:
Net revenue	16,594	15,027	32,562	29,164
Cost of sales :
Cost of sales	5,823	6,150	12,098	12,232
Gross profit :
Gross profit	10,771	8,877	20,464	16,932
Operating expenses:
Operating expenses	5,953	5,115	10,974	10,710
Income from operations:
Income from operations	$ 4,818	$ 3,762	$ 9,490	$ 6,222