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Investments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Net unrealized losses recognized	$ 45,004	$ 44,030
Fair value of securities held on deposit	20,692	17,867
Unrealized losses included in AOCI related to the non-credit portion of other-than-temporary impairments on non-agency residential-mortgage-backed securities	30,492	234,795
Impairment losses on operations	22,807	17,966
Net realized gains on available-for-sale securities	22,807	17,966
Net Investment Income [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities on fixed maturity	4,602,958	1,803,964
Gross gains on available-for-sale securities	295,923	41,989
Gross losses on available-for-sale securities	13,842	17,109
Non-agency residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cumulative unrealized gains included in AOCI related to the non-credit portion of other-than-temporary impairments on non-agency residential-mortgage-backed securities	851	524
Cumulative unrealized losses included in AOCI related to the non-credit portion of other-than-temporary impairments on non-agency residential-mortgage-backed securities	1,880	24
Unrealized losses included in AOCI related to the non-credit portion of other-than-temporary impairments on non-agency residential-mortgage-backed securities	4,262	23,120
Impairment losses on operations	7,531	5,059
Insurance and Financial Services [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value on securities	1,192	31,320
Percentage of amortized cost	20.00%
Percentage of carrying values of all investments	1.00%
Credit losses in operations	22,807	17,966
Credit impairments	5,712	5,059
Change-of-intent impairments	17,095	12,907
Impairment losses on operations	1,529	500
Amortized cost on other-than temporary impairments	162,349	103,312
Fair value on other than temporary impairments	$ 138,013	$ 85,846

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