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Stock Compensation - Summary of Stock Options Outstanding and Related Activity (Detail) - HGI [Member] - $ / shares
shares in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Warrant [Member]      
Options (in shares):      
Stock options outstanding at September 30, 2016 1,200    
Stock options outstanding at March 31, 2017 600   1,200
Weighted Average Exercise Price (in dollars per share):      
Granted $ 13.13   $ 13.13
Exercised 13.13    
Weighted Average Grant Date Fair Value (in dollars per share):      
Granted $ 3.22   $ 3.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 600    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 13.13 $ 13.125  
Restricted award expected to vest $ 3.22    
Employee Stock Option [Member]      
Options (in shares):      
Stock options outstanding at September 30, 2016 4,231    
Granted 318 28  
Exercised (491)    
Stock options outstanding at March 31, 2017 4,058   4,231
Stock options vested and exercisable at March 31, 2017 3,615    
Weighted Average Exercise Price (in dollars per share):      
Granted $ 15.39    
Exercised 11.18    
Stock options outstanding at March 31, 2017 9.73   $ 9.48
Stock options vested and exercisable at March 31, 2017 9.15    
Weighted Average Grant Date Fair Value (in dollars per share):      
Granted 5.96    
Exercised 4.49    
Stock options outstanding at March 31, 2017 3.89   $ 3.80
Stock options vested and exercisable at March 31, 2017 $ 3.67    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 4,058    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 9.73    
Restricted award expected to vest $ 3.89