Net Periodic Benefit Costs (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Oct. 01, 2010
Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4.3	$ 3.7	$ 2.4
Interest cost	5.3	5.0	4.9
Gain (Loss) due to settlement or curtailment	0.9	0	0
Expected return on assets	(5.3)	(4.9)	(4.8)
Amortization of transition obligation	0	0	0
Amortization of prior service cost	0.2	0.1	0.1
Recognized actuarial loss	2.5	2.1	1.7
Net periodic benefit cost	7.9	6.0	4.3
Net (gain) loss arising during the year	9.9	9.6	9.1
Amortization of transition obligation	0	0	0
Amortization of prior service cost	(0.2)	(0.1)	(0.1)
Amortization, settlement and curtailment of net actuarial loss	(3.5)	(2.1)	(1.7)
Total recognized in other comprehensive (income) loss	6.2	7.4	7.3
Total recognized in net periodic benefit cost and other comprehensive loss	14.1	13.4	11.6
Post-Retirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	0.2	0.2	0.3
Gain (Loss) due to settlement or curtailment	0	0	0
Expected return on assets	0	0	0
Amortization of transition obligation	0	0	0.1
Amortization of prior service cost	0	0	0
Recognized actuarial loss	0.1	0.1	0.1
Net periodic benefit cost	0.3	0.3	0.5
Net (gain) loss arising during the year	(0.1)	0.3	(0.1)
Amortization of transition obligation	0	0	(0.1)
Amortization of prior service cost	0	0	0
Amortization, settlement and curtailment of net actuarial loss	(0.1)	(0.1)	(0.1)
Total recognized in other comprehensive (income) loss	(0.2)	0.2	(0.3)
Total recognized in net periodic benefit cost and other comprehensive loss	$ 0.1	$ 0.5	$ 0.2