Acquired Intangible Asset Estimated Fair Value (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Jan. 28, 2011
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	10 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	10 years
Parent Company
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	71,992
Parent Company | Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	31,900
Parent Company | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	23,500
Parent Company | Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	16,500
Parent Company | Other
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	92
Maximum | Other
Acquired Finite-Lived Intangible Assets [Line Items]
Useful Life	1 year