EARNINGS PER SHARE (Reconciliation of the shares used in the basic and diluted net income per share computation) (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
NUMERATOR:
Net income	$ 6,404	$ 1,287	$ (3,555)	$ 7,517	$ 29,635	$ 60,256	$ 36,313	$ (69,528)	$ 11,653		$ 56,676	$ 126,099
DENOMINATOR:
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
Market-based restricted stock (in shares)									662		1,039	1,157
Weighted average shares outstanding - Diluted (1)	64,251	65,431	65,930	67,851	68,675	70,302	71,425	70,577	65,948		70,419	72,063
EPS:
Net income per share - 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
Effect of dilutive shares (in dollars per share)									0		(0.02)	(0.03)
Net income per share - Diluted (in dollars per share)	$ 0.10	$ 0.02	$ (0.05)	$ 0.11	$ 0.43	$ 0.86	$ 0.51	$ (0.99)	$ 0.18	[1]	$ 0.80	$ 1.75

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