SELECTED QUARTERLY FINANCIAL RESULTS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 28, 2019		Sep. 29, 2018	Sep. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue, Net (Deprecated 2018-01-31)	$ 139,827	$ 127,109	$ 115,908	$ 157,208	$ 184,824	$ 268,834	$ 221,772	$ 213,691	$ 540,052		$ 889,121	$ 809,041
Gross profit	65,438	58,780	55,573	74,799	85,823	126,969	99,447	97,202	254,590		409,441	382,094
Income from operations	7,693	1,827	(2,465)	14,555	24,574	64,463	38,436	39,159	21,610		166,632	113,083
Provision for (benefit from) income tax	3,804	3,864	4,672	10,570	(1,750)	7,282	4,800	110,412	22,910		120,744	(7,394)
Net income	$ 6,404	$ 1,287	$ (3,555)	$ 7,517	$ 29,635	$ 60,256	$ 36,313	$ (69,528)	$ 11,653		$ 56,676	$ 126,099
Basic (in dollars per share)	$ 0.10	$ 0.02	$ (0.05)	$ 0.11	$ 0.44	$ 0.87	$ 0.52	$ (0.99)	$ 0.18	[1]	$ 0.82	$ 1.78
Earnings Per Share, Diluted	$ 0.10	$ 0.02	$ (0.05)	$ 0.11	$ 0.43	$ 0.86	$ 0.51	$ (0.99)	$ 0.18	[1]	$ 0.80	$ 1.75
Weighted average shares outstanding - Basic (in shares)	63,401	64,683	65,930	67,176	67,462	69,125	70,361	70,577	65,286		69,380	70,906
Weighted Average Number of Shares Outstanding, Diluted	64,251	65,431	65,930	67,851	68,675	70,302	71,425	70,577	65,948		70,419	72,063

[1] EPS for the year may not equal the sum of quarterly EPS due to changes in weighted share calculations.