Income Taxes (Discussion of Valuation Allowance and Net Deferred Tax Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jan. 03, 2015	Jan. 02, 2016
Valuation Allowance [Line Items]
Resulting tax benefit from realization of the benefit of a portion of remaining deferred tax assets	$ 11,500
Resulting net deferred tax asset	21,300
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ 58,700
Deferred tax assets:
Accrued expenses and reserves	5,416	5,690
Inventory	0	303
Deferred Revenue	0	3,177
Stock-based and deferred compensation	5,530	7,674
Intangible assets	9,841	16,959
Fixed assets	983	0
Net operating loss carry forwards	96,543	131,829
Tax credit carry forwards	40,588	87,909
Capital loss carry forwards	4,142	1,262
Other	220	2,458
Gross deferred tax assets	163,263	257,261
Less: valuation allowance	(141,215)	(252,578)
Net deferred tax assets	22,048	4,683
Deferred tax liabilities
Fixed Assets	0	791
Other	717	3,734
Total deferred tax liabilities	717	4,525
Net deferred tax assets	$ 21,331	158
Do not expire
Valuation Allowance [Line Items]
Tax credit carryforwards		53,400
Federal
Valuation Allowance [Line Items]
Operating loss carryforwards		339,900
Tax credit carryforwards		48,200
State
Valuation Allowance [Line Items]
Operating loss carryforwards		239,900
Tax credit carryforwards		$ 55,900