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Subsequent Events (Detail) - $ / shares
3 Months Ended 9 Months Ended
Aug. 04, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Subsequent Event [Line Items]          
Cash dividend declared (USD per share)   $ 0.10 $ 0.08 $ 0.30 $ 0.24
Subsequent Event          
Subsequent Event [Line Items]          
Cash dividend declared (USD per share) $ 0.10        
Cash dividend declared, payment date Sep. 25, 2015        
Cash dividend declared, record date Sep. 04, 2015