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Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								3 Months Ended				3 Months Ended
	Dec. 30, 2012	Jan. 01, 2012	Sep. 30, 2012	Dec. 30, 2012 Non-agency residential mortgage-backed securities [Member]	Sep. 30, 2012 Non-agency residential mortgage-backed securities [Member]	Dec. 31, 2012 FGL [Member]	Dec. 30, 2012 FGL [Member]	Sep. 30, 2012 FGL [Member] Investment	Dec. 30, 2012 Net Investment Income [Member]	Jan. 01, 2012 Net Investment Income [Member]	Dec. 30, 2012 Concentration [Member] FGL [Member]	Sep. 30, 2012 Concentration [Member] FGL [Member]	Dec. 30, 2012 Insurance and Financial Services [Member]	Sep. 30, 2012 Insurance and Financial Services [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized gains included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities				$ 0.9	$ 0.9
Unrealized losses included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities				1.9	1.9
Fair value of securities held on deposit				20.6	20.7
Unrealized losses included in AOCI related to the non-credit portion of other-than-temporary impairments on non-agency residential-mortgage-backed securities	21.4		30.6
Fair value on securities													0.7	1.2
Percentage of amortized cost													20.00%
Percentage of carrying values of all investments													1.00%
Credit losses in operations	0.5	13.2
Credit losses in operations, including credit impairments	0.2
Credit losses in operations, change of intent operations	0.3
Amortized cost on other-than temporary impairments	1.6	66.9
Fair value on other than temporary impairments	1.1	52.8
Change-of-intent, and non-credit losses in other comprehensive income		0.9
Available for sale securities on fixed maturity									2,415.1	1,733.1
Gross gains on available-for-sale securities									178.0	92.3
Gross losses on available-for-sale securities									0.5	10.5
Net realized gains on available-for-sale securities	0.5	13.2
Fair value of investment						1,878.9	1,131.5	1,082.0			167.0	152.9
Percentage of fair value of the invested assets portfolio						11.00%	6.60%	6.50%			1.00%	0.70%
Investment in issuers							114	8
Percentage of investment accounting							34.80%
FGL's exposure to sub-prime							237.5
FGL's exposure to Alternative-A residential mortgage-backed securities							$ 249.1
Percentage of FGL's exposure to sub-prime to invested assets							1.50%
Percentage of FGL's exposure to Alternative-A residential mortgage-backed securities to invested assets							1.50%
Percentage of stockholders equity							10.00%

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