Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 29, 2018	Sep. 29, 2017
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	$ 851,855	$ 790,619
Less: accumulated depreciation	(349,814)	(305,344)
Property, Plant And Equipment, Net	502,041	485,275
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	43,339	43,364
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	283,459	281,196
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	62,560	65,034
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	104,643	98,437
Computer Systems and Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	187,701	173,341
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	29,737	28,118
Equipment Leased to Other Party [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	129,301	97,456
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	$ 11,115	$ 3,673