Investment Information (Details - Restricted Assets) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010
Restricted Assets [Line Items]
Total restricted assets	$ 5,680,558	$ 5,873,227
Collateral or guarantees - affiliated transactions [Member]
Restricted Assets [Line Items]
Total restricted assets	4,384,970	4,491,649
Collateral or guarantees - third party agreements [Member]
Restricted Assets [Line Items]
Total restricted assets	786,078	948,020
Deposits with US regulatory authorities [Member]
Restricted Assets [Line Items]
Total restricted assets	290,169	263,077
Deposits with non-US regulatory authorities [Member]
Restricted Assets [Line Items]
Total restricted assets	169,476	122,341
Trust funds [Member]
Restricted Assets [Line Items]
Total restricted assets	$ 49,865	$ 48,140