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RESTATEMENT OF CONSOLIDATED FINANCIAL STATEMENTS (Statement of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Sep. 30, 2017		Oct. 01, 2016	Oct. 03, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales									$ 426,947		$ 346,156	$ 284,524
Gross profit	$ 107,400	$ 114,004	$ 92,263	$ 68,427	$ 65,240	$ 99,556	$ 67,745	$ 48,495	382,094		281,036	251,947
Selling, general and administrative									133,601		134,709	123,323
Operating expenses									269,011		227,083	213,356
Income from operations	41,849	15,672	36,503	19,059	4,430	39,862	11,661	(2,000)	113,083		53,953	38,591
Income before income taxes									118,515		56,164	39,045
Income tax expense	2,539	(17,657)	5,151	2,573	(5,576)	7,619	6,978	(1,312)	(7,394)		7,709	(12,867)
Net income	$ 41,225	$ 34,808	$ 32,670	$ 17,396	$ 10,761	$ 32,925	$ 5,109	$ (340)	$ 126,099		$ 48,455	$ 51,912
Net income per share:
Basic (in dollars per share)	$ 0.58	$ 0.49	$ 0.46	$ 0.25	$ 0.15	$ 0.47	$ 0.07	$ 0.00	$ 1.78	[1]	$ 0.69	$ 0.69
Diluted (in dollars per share)	$ 0.57	$ 0.48	$ 0.45	$ 0.24	$ 0.15	$ 0.46	$ 0.07	$ 0.00	$ 1.75	[1]	$ 0.68	$ 0.69
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales									$ 433,995		$ 340,463	$ 277,379
Gross profit	$ 104,739	$ 111,698	$ 90,291	$ 68,318	$ 66,621	$ 100,040	$ 69,647	$ 50,421	375,046		286,729	259,092
Selling, general and administrative									141,382		141,816	131,808
Operating expenses									276,792		234,190	221,841
Income from operations	36,904	11,464	32,605	17,281	3,913	38,622	11,709	(1,705)	98,254		52,539	37,251
Income before income taxes									103,686		54,750	37,705
Income tax expense	2,242	(17,867)	4,882	2,608	(5,661)	7,519	7,045	(1,265)	(8,135)		7,638	(12,934)
Net income	$ 36,576	$ 30,811	$ 29,041	$ 15,583	$ 10,329	$ 31,785	$ 5,089	$ (91)	$ 112,011		$ 47,112	$ 50,639
Net income per share:
Basic (in dollars per share)	$ 0.52	$ 0.43	$ 0.41	$ 0.22	$ 0.15	$ 0.45	$ 0.07	$ 0.00	$ 1.58		$ 0.67	$ 0.67
Diluted (in dollars per share)	$ 0.51	$ 0.43	$ 0.40	$ 0.22	$ 0.15	$ 0.45	$ 0.07	$ 0.00	$ 1.55		$ 0.67	$ 0.67
Effect of Restatement
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales									$ (7,048)		$ 5,693	$ 7,145
Gross profit	$ 2,661	$ 2,306	$ 1,972	$ 109	$ (1,381)	$ (484)	$ (1,902)	$ (1,926)	7,048		(5,693)	(7,145)
Selling, general and administrative									(7,781)		(7,107)	(8,485)
Operating expenses									(7,781)		(7,107)	(8,485)
Income from operations	4,945	4,208	3,898	1,778	517	1,240	(48)	(295)	14,829		1,414	1,340
Income before income taxes									14,829		1,414	1,340
Income tax expense	297	210	269	(35)	85	100	(67)	(47)	741		71	67
Net income	$ 4,649	$ 3,997	$ 3,629	$ 1,813	$ 432	$ 1,140	$ 20	$ (249)	$ 14,088		$ 1,343	$ 1,273
Net income per share:
Basic (in dollars per share)	$ 0.06	$ 0.06	$ 0.05	$ 0.03	$ 0.01	$ 0.02	$ 0.00	$ 0.00	$ 0.20		$ 0.02	$ 0.02
Diluted (in dollars per share)	$ 0.06	$ 0.06	$ 0.05	$ 0.03	$ 0.01	$ 0.02	$ 0.00	$ 0.00	$ 0.20		$ 0.02	$ 0.02
[1] EPS for the year may not equal the sum of quarterly EPS due to changes in weighted share calculations.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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