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Earnings per Share - Additional Information (Detail) - shares
12 Months Ended
Nov. 09, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options outstanding (in shares)   0 0  
Restricted stocks granted   1,690,582 1,513,281 1,517,057
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of diluted earnings per share       11,000
Restricted stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive securities excluded from computation of diluted earnings per share   859,000 120,000 0
Restricted stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Restricted stocks granted   1,690,582    
Restricted stock | Subsequent Event        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Restricted stocks granted 952,200