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Equity-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 02, 2018
Jun. 27, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2016
Oct. 22, 2018
Jun. 28, 2018
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock option vested and exercisable upon issuance     2,175,000     2,175,000          
Equity-based compensation expense       $ 3,839 [1] $ 3,718 $ 28,795 [1]   $ 2,772 [1]      
Unrecognized compensation cost     $ 48,564 $ 17,876   $ 48,564 $ 17,876 $ 20,460      
Unrecognized compensation cost, weighted average recognition period           2 years 4 months 24 days 2 years 4 months 24 days 2 years 4 months 24 days      
IPO                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock options granted           5,747,000          
Stock options granted weighted average exercise price           $ 22.00          
Equity-based compensation expense           $ 19,590          
IPO | First Anniversary of Grant Date                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Vesting period 4 years                    
Stock options weighted average grant date fair value $ 7.59                    
Stock options granted 403,000                    
Stock options granted weighted average exercise price $ 22.00                    
Restricted Stock Awards                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Number of outstanding shares subject to vesting     1,094,000     1,094,000          
Number of shares vested     252,000                
Restricted Stock Awards | IPO                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Number of outstanding shares subject to vesting     684,000     684,000          
Restricted Stock Awards | IPO | First Anniversary of Grant Date                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Vesting period   3 years                  
Units outstanding   684                  
Weighted average exercise price   $ 22.00                  
Class B Units                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock option vested and exercisable upon issuance     608,000     608,000          
Remaining unvested stock option     3,169,000     3,169,000          
Class B Units | IPO                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock options issued to holders of units   5,344,000                  
Stock options issued to holders of units, weighted average exercise price   $ 22.00                  
Stock options weighted average grant date fair value   $ 7.38                  
Stock option vested and exercisable upon issuance   1,567,000                  
Class B Units | Restricted Stock Awards | IPO                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Units outstanding   7,585,000                  
Units converted, weighted average grant date fair value   $ 14.66                  
Number of outstanding shares subject to vesting   1,346,000                  
Class B Units | Restricted Stock Awards | IPO | Common Stock                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Number of units converted   2,241,000                  
The Plan | Class B Units                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Vesting period           5 years          
Percentage of vesting           50.00%          
The Plan | Class B Units | Restricted Stock Units                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Units granted       1,304,000   244,000   4,647,000      
Units redemption       155,000   165,000   1,524,000      
Units forfeiture       650,000   44,000   3,393,000      
Units outstanding     7,585,000 7,550,000   7,585,000 7,550,000 7,051,000     7,321,000
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                   11,650  
ESPP | Subsequent Event                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Common stock shares available for sale                 1,100    
[1] Represents equity-based compensation expense recognized for equity incentive plans outstanding, including $19,590 related to the IPO in the fiscal year ended September 30, 2018.