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Subsequent Events - Additional Information (Detail)
$ / shares in Units, $ in Millions
9 Months Ended
Aug. 14, 2018
USD ($)
$ / shares
shares
Aug. 08, 2018
shares
Jun. 30, 2018
shares
Sep. 30, 2017
shares
Subsequent Event [Line Items]        
Common stock, stock split     Effected a 2.5-for-1 stock split  
Common stock, shares authorized     125,000,000 125,000,000
Preferred stock, shares authorized     5,000,000 5,000,000
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Stock split ratio   2.5    
Common stock, shares authorized   125,000,000    
Preferred stock, shares authorized   5,000,000    
Subsequent Event [Member] | Revolving Credit Facility [Member]        
Subsequent Event [Line Items]        
CIT revolving credit facility outstanding | $ $ 25.7      
Subsequent Event [Member] | IPO [Member]        
Subsequent Event [Line Items]        
Stock issued during period, shares, new issues 9,630,000      
Shares issued, price per share | $ / shares $ 12.00      
Gross proceeds of initial public offering | $ $ 115.6