Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 25, 2021	Sep. 25, 2020
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	$ 1,060,610	$ 1,018,029
Less: accumulated depreciation	(522,189)	(476,066)
Property, Plant And Equipment, Net	538,421	541,963
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	42,070	41,955
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	283,583	283,617
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	91,496	83,764
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	126,548	126,942
Computer Systems and Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	250,347	230,800
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	33,748	31,845
Equipment Leased to Other Party [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	206,966	199,561
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant And Equipment, Gross	$ 25,852	$ 19,545