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Current and Deferred Income Tax Expenses (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Deferred Income Tax Assets And Liabilities    
Income before income taxes $ 31,138 $ 21,475
Current tax expense 8,922 8,809
Deferred tax expense 3,941 608
Total tax expense $ 12,863 $ 9,417