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Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Current tax provision:      
U.S. Federal $ 14,328 $ 27,611 $ 28,124
State 2,613 5,035 5,129
Foreign 1,888 1,757 118
Current income tax expense 18,829 34,403 33,371
Deferred tax (benefit) expense:      
U.S. Federal (2,886) (6,012) (1,454)
State (526) (1,096) (265)
Foreign 4,240 256  
Total deferred tax benefit (expense) 828 (6,852) (1,719)
Total provision $ 19,657 $ 27,551 $ 31,652