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Equity-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Jun. 03, 2019
Nov. 28, 2018
Jun. 30, 2019
Oct. 22, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock options issued to holders of units, weighted average exercise price $ 16.86 $ 13.49    
Stock options weighted average grant date fair value $ 6.84 $ 5.85    
Non-cash equity-based compensation expense over the requisite service period $ 875 $ 6,091    
Unamortized value of outstanding stock-based compensation     $ 46,961  
Unamortized value of outstanding stock-based compensation, weighted average remaining life     1 year 7 months 6 days  
ESPP        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Common stock shares available for sale       1,100,000
Restricted Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Issued shares of common stock   492,000    
Vesting period   4 years    
Weighted average exercise price   $ 13.49    
Non-cash equity-based compensation expense over the requisite service period   $ 6,156    
Restricted Stock Units (RSUs) [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Issued shares of common stock 152,000      
Vesting period 4 years      
Weighted average exercise price $ 16.86      
Non-cash equity-based compensation expense over the requisite service period $ 2,379      
Stock Options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period 4 years 4 years    
Stock options issued to holders of units 138,000 1,123,000