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Income Taxes - Reconciliation Between the Statutory U.S. Income Tax Rate and Effective Rate Derived by Dividing the Provision for Income Taxes by Earnings Before Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Income Tax Disclosure [Abstract]      
Computed income taxes at statutory rate $ 20,078 $ 17,398 $ 14,175
Increase (decrease) in taxes resulting from-      
State and local income taxes 1,270 994 834
Net benefit on foreign dividend (84) (373)   
Qualified domestic production incentives (1,621) (1,226) (1,025)
Uncertain tax position activity (80) (71) (397)
Other, net (233) (377) 82
Income Tax Provision $ 19,330 $ 16,345 $ 13,669
Computed income taxes at statutory rate 35.00% 35.00% 35.00%
State and local income taxes, rate 2.20% 2.00% 2.10%
Net benefit on foreign dividend, rate (0.20%) (0.80%)   
Qualified domestic production incentives, rate (2.80%) (2.50%) (2.50%)
Uncertain tax position activity, rate (0.10%) (0.10%) (1.00%)
Other, net, rate (0.40%) (0.70%) 0.20%
Total, rate 33.70% 32.90% 33.80%