Schedule of Estimated Future Benefit Payments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 28, 2012
Defined Benefit Plan Disclosure [Line Items]
2013	$ 4.0
2014	4.9
2015	4.5
2016	4.9
2017	5.3
2018-2022	30.5
Defined Benefit Plan, Expected Future Benefit Payments, Total, Total	54.1
Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
2013	3.5
2014	4.4
2015	4.0
2016	4.4
2017	4.8
2018-2022	28.4
Defined Benefit Plan, Expected Future Benefit Payments, Total, Total	49.5
Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
2013	0.5
2014	0.5
2015	0.5
2016	0.5
2017	0.5
2018-2022	2.1
Defined Benefit Plan, Expected Future Benefit Payments, Total, Total	$ 4.6