Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Property and equipment [Line Items]
Less: Accumulated depreciation and amortization	$ (220,532)	$ (196,496)
Property and equipment, net	208,646	208,367
Land [Member]
Property and equipment [Line Items]
Property and equipment, gross	1,999	1,999
Leasehold Improvements [Member]
Property and equipment [Line Items]
Property and equipment, gross	102,495	97,600
Office furniture and equipment [Member]
Property and equipment [Line Items]
Property and equipment, gross	94,265	81,541
Production machinery, computer equipment and software [Member]
Property and equipment [Line Items]
Property and equipment, gross	224,758	209,900
Construction in Progress [Member]
Property and equipment [Line Items]
Property and equipment, gross	$ 5,661	$ 13,823