Balance Sheet Components - Components of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Oct. 02, 2015	Sep. 26, 2014	Sep. 27, 2013
Balance Sheet Related Disclosures [Abstract]
Land and land improvements	$ 49,100	$ 45,100
Buildings and leasehold improvements	267,000	260,800
Machinery and equipment	437,200	425,400
Construction in progress	99,600	44,700
Property, plant and equipment:	852,900	776,000
Accumulated depreciation and amortization	(473,700)	(438,000)
Total property, plant and equipment, net	$ 379,215	$ 337,999	$ 315,300