Restructuring (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Jan. 30, 2015	Jan. 24, 2014	Oct. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,694	$ 5,700
Cost Of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,849	6,106
Research And Development Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	552
Selling, General And Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,142	5,700
Two Thousand Fourteen And Two Thousand Fifteen Restructuring Initiatives [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6,543
Pre-tax asset impairment charges	1,338
2013 And 2014 Restructuring Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		11,806
Pre-tax asset impairment charges		5,265	11,141
Two Thousand Thirteen And Two Thousand Fourteen And Two Thousand Fifteen Restructuring Initiatives [Member] [Domain]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 41,139