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Equity-Based Compensation - Additional Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jul. 02, 2018
USD ($)
Installment
$ / shares
shares
Jun. 27, 2018
shares
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
USD ($)
Jun. 28, 2018
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Equity-based compensation expense | $ [1]     $ 14,951 $ 2,193 $ 20,753 $ 2,637  
Unamortized value of outstanding stock-based compensation | $     32,424   $ 32,424    
Unamortized value of outstanding stock-based compensation, weighted average remaining life         2 years 3 months 18 days    
2018 Omnibus Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of shares of common stock that may be issued | shares             11,650,000
Class B Profits Interest Units | The Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Equity-based compensation expense | $     1,540        
Stock Options              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Equity-based compensation expense | $     $ 11,423        
Options vesting upon grant | shares     1,500,000        
Options vest over periods | shares     3,800,000   3,800,000    
Remaining options vesting period         5 years    
Stock Options | 2018 Omnibus Incentive Plan | Subsequent Event              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Shares granted | shares 600,000            
Price per share | $ / shares $ 22.00            
Number of equal installments units will vest | Installment 4            
Non-cash equity-based compensation expense over the requisit service period | $ $ 4,632            
Stock Options | IPO              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock options issued | shares   5,300,000          
Restricted Stock | 2018 Omnibus Incentive Plan | Subsequent Event              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of equal installments units will vest | Installment 3            
Shares granted | shares 700,000            
Non-cash equity-based compensation expense over the requisit service period | $ $ 14,850            
[1] Represents equity-based compensation expense recognized for equity incentive plans outstanding.