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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jul. 02, 2021
Jul. 03, 2020
Jul. 02, 2021
Jul. 03, 2020
Earnings Per Share [Abstract]        
Fair Value Adjustment of Warrants $ 0 $ 19,511 $ 11,130 $ 14,951
Numerator:        
Net income (loss) 15,005 (24,982) 20,844 (63,570)
Net income (loss) attributable to common stockholders $ 15,005 $ (24,982) $ 20,844 $ (63,570)
Denominator:        
Weighted average common shares outstanding-basic 68,732,000 66,796,000 68,331,000 66,512,000
Dilutive effect of options and warrants (in shares) 2,148,000 0 1,951,000 0
Weighted average common shares outstanding-diluted 70,880,000 66,796,000 70,282,000 66,512,000
Earnings Per Share, Basic [Abstract]        
Income (loss) per share - Basic $ 0.22 $ (0.37) $ 0.31 $ (0.96)
Number of antidilutive shares of common stock excluded from the calculation (in shares)   1,766,561 116,659 1,543,686