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Investments - Portfolio of Asset-Backed Loans and Other Invested Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 30, 2012	Sep. 30, 2012
Asset-backed loans, by major industry:
Total asset-backed loans	$ 207.4	$ 181.5
Less: Allowance for credit losses	2.6	1.4
Total asset-backed loans, net	204.8	180.1
Wholesale [Member]
Asset-backed loans, by major industry:
Total asset-backed loans	101.9	77.2
Apparel [Member]
Asset-backed loans, by major industry:
Total asset-backed loans	49.1	70.1
Jewelry [Member]
Asset-backed loans, by major industry:
Total asset-backed loans	23.0	27.9
Other [Member]
Asset-backed loans, by major industry:
Total asset-backed loans	$ 33.4	$ 6.3