Goodwill And Intangible Assets (Schedule Of Amortization Of Intangible Assets Included On Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Jan. 28, 2017	Jan. 30, 2016	Oct. 31, 2015
Amortization of Finite-Lived Intangible Assets [Line Items]
Amortization		$ 20,913	$ 4,333
Cost of revenues
Amortization of Finite-Lived Intangible Assets [Line Items]
Amortization		13,060	3,154
General and administrative
Amortization of Finite-Lived Intangible Assets [Line Items]
Amortization	[1]	259	277
Other Operating Income (Expense)
Amortization of Finite-Lived Intangible Assets [Line Items]
Amortization		$ 7,594	$ 902
Patent portfolio license (1)
Amortization of Finite-Lived Intangible Assets [Line Items]
Purchase of intangible assets	[2]			$ (7,750)

[1] The amortization is related to the $7.8 million of perpetual, nonexclusive license to certain patents purchased in fiscal year 2015.

[2] The patent portfolio license was assigned an estimated useful life that reflects the Company’s consumption of the expected defensive benefits related to this license to certain patents. The method of amortization for the patent portfolio license reflects the Company’s estimate of the pattern in which these expected defensive benefits will be used by the Company and is primarily based on the mix of expiration patterns of the individual patents included in the license.