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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Treasury Stock
Accumulated Other Comprehensive Income
Additional Paid-in Capital
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Balance at beginning of period, (in shares) at Sep. 27, 2019     66,177          
Balance at beginning of period at Sep. 27, 2019 $ 313,896   $ 66 $ (330) $ 4,358 $ 1,101,576 $ (791,774)  
Balance at beginning of period, treasury stock (in shares) at Sep. 27, 2019       23        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock option exercises (in shares)     41          
Stock option exercises 168         168    
Vesting of restricted common stock and units (in shares)     636          
Vesting of restricted common stock and units 1   $ 1          
Issuance of common stock pursuant to employee stock purchase plan (in shares)     272          
Issuance of common stock pursuant to employee stock purchase plan 4,397         4,397    
Shares repurchased for stock withholdings on restricted stock awards (in shares)     (223)          
Shares repurchased for tax withholdings on equity awards (6,557)         (6,557)    
Share-based compensation 26,921         26,921    
Other comprehensive loss, net of tax (77)       77      
Net income (63,570)           (63,570)  
Balance at end of period, (in shares) at Jul. 03, 2020     66,903          
Balance at end of period at Jul. 03, 2020 273,304   $ 67 $ (330) 4,281 1,126,505 (857,219)  
Balance at end of period, treasury stock (in shares) at Jul. 03, 2020       23        
Balance at beginning of period, (in shares) at Apr. 03, 2020     66,718          
Balance at beginning of period at Apr. 03, 2020 285,731   $ 67 $ (330) 2,126 1,116,105 (832,237)  
Balance at beginning of period, treasury stock (in shares) at Apr. 03, 2020       23        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock option exercises (in shares)     23          
Stock option exercises 46         46    
Vesting of restricted common stock and units (in shares)     72          
Vesting of restricted common stock and units 0   $ 0          
Issuance of common stock pursuant to employee stock purchase plan (in shares)     112          
Issuance of common stock pursuant to employee stock purchase plan 2,467         2,467    
Shares repurchased for stock withholdings on restricted stock awards (in shares)     (22)          
Shares repurchased for tax withholdings on equity awards (608)         (608)    
Share-based compensation 8,495         8,495    
Other comprehensive loss, net of tax 2,155       2,155      
Net income (24,982)           (24,982)  
Balance at end of period, (in shares) at Jul. 03, 2020     66,903          
Balance at end of period at Jul. 03, 2020 273,304   $ 67 $ (330) 4,281 1,126,505 (857,219)  
Balance at end of period, treasury stock (in shares) at Jul. 03, 2020       23        
Balance at beginning of period, (in shares) at Oct. 02, 2020     66,921          
Balance at beginning of period at Oct. 02, 2020 $ 300,146   $ 67 $ (330) 5,009 1,135,127 (839,727)  
Balance at beginning of period, treasury stock (in shares) at Oct. 02, 2020       23        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member              
Balance at end of period, (in shares) at Apr. 02, 2021     68,692          
Balance at end of period at Apr. 02, 2021 $ 412,133   $ 69 $ (330) 4,462 1,241,820 (833,888)  
Balance at end of period, treasury stock (in shares) at Apr. 02, 2021       23        
Balance at beginning of period, (in shares) at Oct. 02, 2020     66,921          
Balance at beginning of period at Oct. 02, 2020 $ 300,146   $ 67 $ (330) 5,009 1,135,127 (839,727)  
Balance at beginning of period, treasury stock (in shares) at Oct. 02, 2020       23        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock option exercises (in shares) 60   60          
Stock option exercises $ 978         978    
Vesting of restricted common stock and units (in shares)     1,284          
Vesting of restricted common stock and units 1   $ 1          
Issuance of common stock pursuant to employee stock purchase plan (in shares)     166          
Issuance of common stock pursuant to employee stock purchase plan 4,796         4,796    
Shares repurchased for stock withholdings on restricted stock awards (in shares)     (473)          
Shares repurchased for tax withholdings on equity awards (23,404)         (23,404)    
Share-based compensation 26,841         26,841    
Other comprehensive loss, net of tax (541)       (541)      
Equity component of convertible notes, net 79,690         79,690    
Issuance of common stock for the cashless exercise of warrants (in shares)     858          
Issuance of common stock for the cashless exercise of warrants 36,442   $ 1     36,441    
Net income 20,844           20,844  
Balance at end of period, (in shares) at Jul. 02, 2021     68,816          
Balance at end of period at Jul. 02, 2021 445,793 $ (1,875) $ 69 $ (330) 4,468 1,260,469 (818,883) $ (1,875)
Balance at end of period, treasury stock (in shares) at Jul. 02, 2021       23        
Balance at beginning of period, (in shares) at Apr. 02, 2021     68,692          
Balance at beginning of period at Apr. 02, 2021 412,133   $ 69 $ (330) 4,462 1,241,820 (833,888)  
Balance at beginning of period, treasury stock (in shares) at Apr. 02, 2021       23        
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Stock option exercises (in shares)     10          
Stock option exercises 161         161    
Vesting of restricted common stock and units (in shares)     62          
Vesting of restricted common stock and units 0   $ 0          
Issuance of common stock pursuant to employee stock purchase plan (in shares)     73          
Issuance of common stock pursuant to employee stock purchase plan 2,557         2,557    
Shares repurchased for stock withholdings on restricted stock awards (in shares)     (21)          
Shares repurchased for tax withholdings on equity awards (1,066)         (1,066)    
Share-based compensation 8,141         8,141    
Other comprehensive loss, net of tax 6       6      
Equity component of convertible notes, net 8,856         8,856    
Net income 15,005           15,005  
Balance at end of period, (in shares) at Jul. 02, 2021     68,816          
Balance at end of period at Jul. 02, 2021 $ 445,793 $ (1,875) $ 69 $ (330) $ 4,468 $ 1,260,469 $ (818,883) $ (1,875)
Balance at end of period, treasury stock (in shares) at Jul. 02, 2021       23