Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	Jun. 27, 2014	Sep. 27, 2013
Finite Lived Intangible Assets [Line Items]
Accumulated amortization	$ (54.7)	$ (53.1)
Net carrying amount	31.7	23.4
Acquired existing technology
Finite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Gross	46.6	36.6
Patents, licenses and other
Finite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Gross	27.9	29.0
Customer contracts and supplier relationship
Finite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Gross	$ 11.9	$ 10.9