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Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator for diluted and basic earnings per share:        
Net income $ 19,906 $ 20,548 $ 53,183 $ 58,276
Denominator - share:        
Basic weighted-average shares 31,118 34,210 31,465 34,458
Effect of dilutive securities 1,245 952 1,183 962
Diluted weighted-average shares 32,363 35,162 32,648 35,420
Earnings per share:        
Basic (in dollars per share) $ 0.64 $ 0.60 $ 1.69 $ 1.69
Diluted (in dollars per share) $ 0.62 $ 0.58 $ 1.63 $ 1.65