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Current and Deferred Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Deferred Income Tax Assets And Liabilities [Line Items]    
Income before income taxes $ 14,669 $ 5,583
Current tax expense 4,053 1,498
Deferred tax expense 864 1,154
Total tax expense $ 4,917 $ 2,652