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Current and Deferred Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Deferred Income Tax Assets And Liabilities [Line Items]        
Income before income taxes $ 70,796 $ 69,873 $ 85,465 $ 75,456
Current tax expense 21,330 7,615 25,383 9,113
Deferred tax expense 7,787 21,776 8,651 22,930
Total tax expense $ 29,117 $ 29,391 $ 34,034 $ 32,043