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Earnings Per Share (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 04, 2020
Apr. 04, 2020
Dec. 28, 2019
Jun. 29, 2019
Mar. 30, 2019
Dec. 29, 2018
Jul. 04, 2020
Jun. 29, 2019
Earnings Per Share, Basic and Diluted [Abstract]                
Weighted average shares outstanding—basic (in shares) 24,159,000     24,054,000     24,075,000 24,185,000
Dilutive effect of employee stock awards (in shares) 0     0     0 148,000
Weighted average shares outstanding—diluted (in shares) 24,159,000     24,054,000     24,075,000 24,333,000
Net income (loss) $ (8,708) $ (418,913) $ 5,793 $ (3,099) $ 20,750 $ 35,550 $ (421,828) $ 53,201
Earnings Per Share, Diluted, Other Disclosures [Abstract]                
Dilutive securities excluded from calculation of dilutive shares       0       97,420