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Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Fair Value of Financial Instruments - Changes in Fair Value of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended														3 Months Ended
	Dec. 30, 2012	Jan. 01, 2012	Dec. 30, 2012 Asset-backed securities [Member]	Jan. 01, 2012 Asset-backed securities [Member]	Dec. 30, 2012 Commercial mortgage-backed securities [Member]	Dec. 30, 2012 Corporates [Member]	Jan. 01, 2012 Corporates [Member]	Dec. 30, 2012 Hybrids [Member]	Jan. 01, 2012 Hybrids [Member]	Dec. 30, 2012 Municipals [Member]	Jan. 01, 2012 Municipals [Member]	Jan. 01, 2012 Non-agency residential mortgage-backed securities [Member]	Dec. 30, 2012 Contingent purchase price reduction receivable [Member]	Sep. 30, 2012 Contingent purchase price reduction receivable [Member]	Jan. 01, 2012 Agency residential mortgage-backed securities [Member]	Dec. 30, 2012 FIA embedded derivatives, included in contractholder funds [Member]	Jan. 01, 2012 FIA embedded derivatives, included in contractholder funds [Member]	Dec. 30, 2012 Equity conversion feature of preferred stock [Member]	Jan. 01, 2012 Equity conversion feature of preferred stock [Member]	Jan. 01, 2012 Available-for-sale embedded derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at Beginning of Period	$ 206.0	$ 546.5	$ 15.9	$ 374.5	$ 5.0	$ 135.3	$ 159.7	$ 8.8	$ 5.2			$ 3.8	$ 41.0	$ 41.0	$ 3.3
Total Gains (Losses) Included in Earnings	(0.2)	(0.1)				(0.2)	(0.1)
Total Gains (Losses) Included in AOCI	(2.1)	(5.6)	(0.1)	(4.6)	0.1	(2.0)	(0.9)	(0.1)	(0.1)
Purchases	134.2	38.8		38.8	1.0	133.2
Sales	(9.6)	(7.0)				(9.6)	(7.0)
Settlements	(0.7)	(10.9)		(8.0)		(0.7)	(2.8)					(0.1)
Net transfer In (Out) of Level 3	(14.1)	(10.3)	(10.5)			0.1	(10.4)	(3.7)			0.1
Balance at End of Period	313.5	551.4	5.3	400.7	6.1	256.1	138.5	5.0	5.1		0.1	3.7	41.0	41.0	3.3
Balance at Beginning of Period	1,782.8	1,472.1														1,550.8	1,396.3	232.0	75.4	0.4
Total Gains (Losses) Included in Earnings	(102.7)	30.8														(33.8)	58.7	(68.9)	(27.9)
Total Gains (Losses) Included in AOCI
Purchases
Sales
Settlements
Net Transfer in (Out) of Level 3
Balance at End of Period	$ 1,680.1	$ 1,502.9														$ 1,517.0	$ 1,455.0	$ 163.1	$ 47.5	$ 0.4