Convertible Senior Notes - Components of Convertible Senior Notes (Details) (1.75% Convertible Senior Notes Due June 1, 2018 [Member], USD $)	May 30, 2013	Sep. 27, 2014 Additional Paid-in Capital [Member]	Sep. 27, 2014 Other Noncurrent Assets [Member]	Sep. 27, 2014 Long-term Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 150,000,000.0			$ 150,000,000
Debt discount				(45,000,000)
Equity component		45,000,000
Initial transaction amounts and debt issuance cost			3,872,000
Debt issuance cost		(1,659,000)
Initial transaction amounts, long-term debt				105,000,000
Initial transaction amount and net carrying amount, APIC		43,341,000
Amortization of debt issuance cost			(851,000)
Amortization of debt discount				9,888,000
Net carrying amount, other non-current assets			3,021,000
Net carrying amount, long-term debt				$ 114,888,000