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Investments - Other-than-Temporary Impairments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Other-than-temporary impairments recognized in net income:
Total other-than-temporary impairments	$ 22,807	$ 17,966
Commercial Mortgages Backed Securities [Member]
Other-than-temporary impairments recognized in net income:
Total other-than-temporary impairments		20
Corporates [Member]
Other-than-temporary impairments recognized in net income:
Total other-than-temporary impairments	4,116	1,462
Equity [Member]
Other-than-temporary impairments recognized in net income:
Total other-than-temporary impairments		11,007
Hybrids [Member]
Other-than-temporary impairments recognized in net income:
Total other-than-temporary impairments	9,688
Non-agency residential mortgage-backed securities [Member]
Other-than-temporary impairments recognized in net income:
Total other-than-temporary impairments	7,531	5,059
Other Invested Assets [Member]
Other-than-temporary impairments recognized in net income:
Total other-than-temporary impairments	$ 1,472	$ 418

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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