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Stockholders' Equity (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Feb. 23, 2019
USD ($)
$ / shares
shares
Nov. 24, 2018
USD ($)
shares
Feb. 23, 2019
USD ($)
$ / shares
shares
Feb. 24, 2018
USD ($)
Jul. 06, 2017
shares
Class of Stock [Line Items]          
Cash received from warrant exercises | $     $ 113,464 $ 231  
Public Warrants          
Class of Stock [Line Items]          
Warrants issued (in shares)         13,416,667
Warrants exercised prior to redemption (in shares)     9,866,451    
Cash received from warrant exercises | $   $ 113,500      
Warrant price per share (in dollars per share) | $ / shares $ 11.50   $ 11.50    
Common shares surrendered upon cashless exercise   0.61885      
Common shares issued upon cashless exercise   0.38115      
Warrants exercised on a cashless basis (in shares)   3,499,639      
Common shares issued for warrants exercised on a cashess basis (in shares)   1,333,848      
Private Placement Warrants          
Class of Stock [Line Items]          
Warrants issued (in shares) 6,700,000   6,700,000    
Treasury Stock          
Class of Stock [Line Items]          
Stock repurchase program, authorized amount | $ $ 50,000   $ 50,000    
Repurchase of common stock (in shares) 6,729   6,729    
Repurchase of common stock, average cost per share | $ / shares     $ 18.92