Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 03, 2020	Jun. 28, 2019	Jul. 03, 2020	Jun. 28, 2019
Earnings Per Share [Abstract]
Fair Value Adjustment of Warrants	$ 19,511	$ (1,927)	$ 14,951	$ (5,788)
Numerator:
Net loss	(24,982)	(324,714)	(63,570)	(394,314)
Warrant liability gain	0	(1,927)	0	(5,788)
Net loss attributable to common stockholders	$ (24,982)	$ (326,641)	$ (63,570)	$ (400,102)
Denominator:
Weighted average common shares outstanding-basic	66,796,000	65,858,000	66,512,000	65,555,000
Dilutive effect of options and warrants (in shares)	0	86,746	0	166,318
Weighted average common shares outstanding-diluted	66,796,000	65,945,000	66,512,000	65,722,000
Earnings Per Share, Basic [Abstract]
Loss per share - Basic	$ (0.37)	$ (4.93)	$ (0.96)	$ (6.01)
Number of antidilutive shares of common stock excluded from the calculation (in shares)	1,766,561	80,046	1,543,686	129,599