Income Taxes (Schedule of Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Deferred tax assets:
Accrued expenses	$ 23,295	$ 25,454
Tax credits and separate return net operating losses	26,304	27,762
Share based compensation	56,263	81,133
Contract and service revenues and costs	0	59,217
Other	17,754	9,723
Total deferred tax assets	123,616	203,289
Deferred tax liabilities:
Software development costs	(208,494)	(275,888)
Depreciation and amortization	(96,492)	(133,424)
Prepaid expenses	(21,214)	(30,255)
Contract and service revenues and costs	(65,043)	0
Other	(10,400)	(3,050)
Total deferred tax liabilities	(401,643)	(442,617)
Net deferred tax liability	$ (278,027)	$ (239,328)