Balance Sheet Components - Components of Property, Plant and Equipment (Detail) (USD $)	Sep. 26, 2014	Sep. 27, 2013
Property, plant and equipment:
Land and land improvements	$ 45,100,000	$ 44,600,000
Buildings and leasehold improvements	260,800,000	242,200,000
Machinery and equipment	424,000,000	380,800,000
Construction in progress	44,700,000	46,600,000
Assets subject to lease	1,400,000	1,800,000
Property Plant and Equipment, Gross	776,000,000	716,000,000
Accumulated depreciation and amortization	(438,000,000)	(400,700,000)
Property, plant and equipment, net	$ 337,999,000	$ 315,331,000