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SELECTED QUARTERLY FINANCIAL RESULTS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands						3 Months Ended								12 Months Ended
	Aug. 26, 2020	May 29, 2020	Feb. 20, 2020	Dec. 12, 2019	Aug. 07, 2019	Oct. 03, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Oct. 03, 2020		Sep. 28, 2019		Sep. 29, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue						$ 177,688	$ 150,450	$ 150,741	$ 144,297	$ 139,827	$ 127,109	$ 115,908	$ 157,208	$ 623,176		$ 540,052		$ 889,121
Gross profit						88,885	69,423	69,303	70,364	65,438	58,780	55,573	74,799	297,975		254,590		409,441
Income from operations						23,048	10,971	11,076	13,414	7,693	1,827	(2,465)	14,555	58,509		21,610		166,632
Provision for income taxes						8,013	690	1,162	2,133	3,804	3,864	4,672	10,570	11,998		22,910		120,744
Net income						$ 15,784	$ 11,151	$ 11,888	$ 13,477	$ 6,404	$ 1,287	$ (3,555)	$ 7,517	$ 52,300		$ 11,653		$ 56,676
Basic (in dollars per share)						$ 0.26	$ 0.18	$ 0.19	$ 0.21	$ 0.10	$ 0.02	$ (0.05)	$ 0.11	$ 0.83	[1]	$ 0.18	[1]	$ 0.82
Earnings Per Share, Diluted						$ 0.25	$ 0.18	$ 0.19	$ 0.21	$ 0.10	$ 0.02	$ (0.05)	$ 0.11	$ 0.83	[1]	$ 0.18	[1]	$ 0.80
Weighted average shares outstanding - Basic (in shares)						61,791	62,313	63,679	63,557	63,401	64,683	65,930	67,176	62,828		65,286		69,380
Weighted Average Number of Shares Outstanding, Diluted						62,411	62,833	64,219	64,139	64,251	65,431	65,930	67,851	63,359		65,948		70,419
Common Stock, Dividends, Per Share, Declared	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12	$ 0.12		$ 0.48		$ 0.48
[1] EPS for the year may not equal the sum of quarterly EPS due to changes in weighted share calculations.

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