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Consolidated Statement of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Additional Paid-In Capital
Accumulated Deficit
Beginning Balance (in shares) at Sep. 30, 2016   53,709        
Beginning balance at Sep. 30, 2016 $ 462,784 $ 54 $ (330) $ 9,039 $ 551,509 $ (97,488)
Beginning Balance Treasury stock (in shares) at Sep. 30, 2016     (23)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock option exercise (in shares)   234        
Stock option exercises 3,117       3,117  
Vesting of restricted common stock and units (in shares)   984        
Vesting of restricted common stock and units 0 $ 0        
Issuance of common stock pursuant to employee stock purchase plan (in shares)   145        
Issuance of common stock pursuant to employee stock purchase plan 5,164       5,164  
Shares repurchased for tax withholdings on restricted stock awards (in shares)   (382)        
Shares repurchased for tax withholdings on restricted stock awards (18,534) $ 0     (18,534)  
Share-based compensation 36,335       36,335  
Shares issued in connection with acquisition including converted equity awards (in shares)   9,589        
Shares issued in connection with the AppliedMicro acquisition including converted equity awards 465,082 $ 10     465,072  
Equity issuance costs (1,019)       (1,019)  
Other comprehensive loss, net of tax (6,062)     (6,062)    
Net loss (169,493)         (169,493)
Ending Balance (in shares) at Sep. 29, 2017   64,279        
Ending balance at Sep. 29, 2017 777,374 $ 64 $ (330) 2,977 1,041,644 (266,981)
Ending Balance Treasury stock (in shares) at Sep. 29, 2017     (23)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stock option exercise (in shares)   27        
Stock option exercises 76       76  
Vesting of restricted common stock and units (in shares)   906        
Vesting of restricted common stock and units 1 $ 1        
Issuance of common stock pursuant to employee stock purchase plan (in shares)   306        
Issuance of common stock pursuant to employee stock purchase plan 6,881       6,881  
Shares repurchased for tax withholdings on restricted stock awards (in shares)   (316)        
Shares repurchased for tax withholdings on restricted stock awards (6,828)       (6,828)  
Share-based compensation 31,937       31,937  
Other comprehensive loss, net of tax (789)     (789)    
Net loss (139,977)         (139,977)
Ending Balance (in shares) at Sep. 28, 2018   65,202        
Ending balance at Sep. 28, 2018 $ 668,675 $ 65 $ (330) 2,188 1,074,728 (407,976)
Ending Balance Treasury stock (in shares) at Sep. 28, 2018 23   (23)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative Effect of New Accounting Principle in Period of Adoption $ 0       1,018 (1,018)
Stock option exercise (in shares) 119 119        
Stock option exercises $ 1,608 $ 0     1,608  
Vesting of restricted common stock and units (in shares)   673        
Vesting of restricted common stock and units 1 $ 1        
Issuance of common stock pursuant to employee stock purchase plan (in shares)   422        
Issuance of common stock pursuant to employee stock purchase plan 5,585       5,585  
Shares repurchased for tax withholdings on restricted stock awards (in shares)   (239)        
Shares repurchased for tax withholdings on restricted stock awards (4,137) $ 0     (4,137)  
Share-based compensation 23,792       23,792  
Other comprehensive loss, net of tax 2,170     2,170    
Net loss (383,798)         (383,798)
Ending Balance (in shares) at Sep. 27, 2019   66,177        
Ending balance at Sep. 27, 2019 $ 313,896 $ 66 $ (330) $ 4,358 $ 1,101,576 $ (791,774)
Ending Balance Treasury stock (in shares) at Sep. 27, 2019 23   (23)