Quarterly report pursuant to Section 13 or 15(d)

Earnings per Share - Summary of Calculation of the Weighted Average Number of Diluted Common Shares Outstanding and the Calculation of Diluted Earnings Per Share (Detail)

v3.10.0.1
Earnings per Share - Summary of Calculation of the Weighted Average Number of Diluted Common Shares Outstanding and the Calculation of Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator        
Net income attributable to common stockholders $ 13,403 $ 6,412 $ 35,647 $ 13,773
Denominator        
Weighted average number of basic common shares outstanding 46,557,785 41,538,989 43,648,309 41,514,656
Effect of dilutive securities:        
Weighted average number of diluted common shares outstanding: 46,988,359 41,566,344 43,932,546 41,541,447
Net income per diluted common share attributable to common stockholders $ 0.29 $ 0.15 $ 0.81 $ 0.33
Restricted Stock [Member]        
Effect of dilutive securities:        
Dilutive options 42,682   13,074  
2016 Equity Incentive Plan Options [Member]        
Effect of dilutive securities:        
Dilutive options   27,355   26,791
2010 Non-Plan Stock Options Agreement Options [Member]        
Effect of dilutive securities:        
Dilutive options 387,892   271,163