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SEGMENT INFORMATION (Operating information by segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Net revenue:
Net revenue	$ 194,733	$ 180,517	$ 114,206	$ 79,113	$ 173,608	$ 141,181	$ 106,110	$ 114,039	$ 568,569	$ 534,938	$ 791,023
Cost of sales :
Cost of sales									295,015	287,993	423,633
Gross profit :
Gross profit	92,360	85,157	57,672	38,365	80,686	65,914	48,820	51,525	273,554	246,945	367,390
Operating expenses:
Operating expenses									196,570	181,139	188,164
Income from operations:
Income from operations	37,497	31,584	10,111	(2,208)	34,544	18,867	8,190	4,205	76,984	65,806	179,226
Equipment [Member]
Net revenue:
Net revenue									503,049	472,567	727,082
Cost of sales :
Cost of sales									268,934	261,270	397,210
Gross profit :
Gross profit									234,115	211,297	329,872
Operating expenses:
Operating expenses									174,346	158,306	164,081
Income from operations:
Income from operations									59,769	52,991	165,791
Expendable Tools [Member]
Net revenue:
Net revenue									65,520	62,371	63,941
Cost of sales :
Cost of sales									26,081	26,723	26,423
Gross profit :
Gross profit									39,439	35,648	37,518
Operating expenses:
Operating expenses									22,224	22,833	24,083
Income from operations:
Income from operations									$ 17,215	$ 12,815	$ 13,435