Reinsurance - Effect of Reinsurance on Premiums Earned, Benefits Incurred and Reserve Changes (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended		15 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jul. 01, 2012	Jul. 01, 2013
Insurance Premiums:
Direct	$ 69.9	$ 212.3	$ 225.7	$ 74.5
Assumed	9.1	24.5	35.7	11.4
Ceded	(60.0)	(189.9)	(219.2)	(73.8)
Net	19.0	46.9	42.2	12.1
Benefits and Other Changes in Insurance Policy Reserves:
Direct	150.9	579.8	749.7	224.9
Assumed	8.2	15.7	27.0	9.0
Ceded	(51.9)	(163.8)	(217.0)	(92.9)
Net	$ 107.2	$ 431.7	$ 559.7	$ 141.0