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Summary of Marketable Securities Including Accrued Interest Receivable (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]    
Investments, fair value $ 142,104 $ 146,985
Mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Investments, fair value 1,469 [1] 1,549 [1]
Mortgage-backed securities | Federal Home Loan Mortgage and Federal National Mortgage Association
   
Schedule of Available-for-sale Securities [Line Items]    
Investments, fair value $ 700 $ 700
[1] Fair value amounts include approximately $0.7 million of investments in the Federal Home Loan Mortgage and Federal National Mortgage Association.