Balance Sheet Details (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Jan. 01, 2011
Inventories
Work in progress	$ 28,023	$ 32,977
Finished goods	6,755	6,473
Total inventories	34,778	39,450
Prepaid Expenses and Other Current Assets
Distributor Advances	23,221	9,887
Other	20,646	24,560
Prepaid expenses and other current assets	43,867	34,447
Property and Equipment
Property and equipment, gross	97,493	94,114
Accumulated depreciation	(72,352)	(64,169)
Property and equipment, net	25,141	29,945
Accrued Expenses
Accrued compensation and benefits	17,948	15,115
Other	12,909	10,489
Accrued expenses	30,857	25,604
Long-term Obligations and Other Liabilities
Unrecognized tax benefits (including interest)	10,943	10,187
CAD software license accruals	6,047	420
Other	7,224	11,765
Long-term Obligations and Other Liabilities	24,214	22,372
Equipment
Property and Equipment
Property and equipment, gross	43,934	40,520
Computers and purchased software
Property and Equipment
Property and equipment, gross	28,371	29,501
Furniture and fixtures
Property and Equipment
Property and equipment, gross	3,356	3,051
Leasehold improvements
Property and Equipment
Property and equipment, gross	$ 21,832	$ 21,042