Property, Plant And Equipment (Narrative) (Details) (USD $)	12 Months Ended							12 Months Ended		12 Months Ended	1 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012	Sep. 27, 2014 Capital Lease Additions [Member]	Sep. 28, 2013 Capital Lease Additions [Member]	Sep. 29, 2012 Capital Lease Additions [Member]	Sep. 27, 2014 San Diego Facility [Member]	Sep. 27, 2014 Assets Held under Capital Leases [Member]	Sep. 28, 2013 Assets Held under Capital Leases [Member]	Sep. 27, 2014 Leasehold Improvements [Member]	Jul. 31, 2029 Loss Contingency, Nature [Domain]	Jul. 31, 2024 Loss Contingency, Nature [Domain]
Property, plant and equipment, net	$ 334,926,000	$ 325,061,000					$ 4,300,000	$ 7,405,000	$ 9,928,000
Amortization of assets held under capital leases	600,000	600,000	800,000
Capital lease additions				1,400,000	1,400,000	100,000		8,000,000		16,200,000
Accounts payable related to the purchase of property, plant and equipment	7,000,000	10,900,000	11,500,000
Gain (Loss) on Disposition of Property Plant Equipment	$ 183,000	$ 104,000	$ (1,353,000)								$ 300,000	$ 3,200,000