Segment Information (Schedule Of Financial Information By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 28, 2012	Apr. 30, 2011	Apr. 28, 2012	Apr. 30, 2011
Segment Reporting Information [Line Items]
Net revenues	$ 543,439	$ 548,364	$ 1,104,081	$ 1,094,120
Cost of revenues	206,357	219,755	422,230	444,628
Gross margin	337,082	328,609	681,851	649,492
Data Storage products
Segment Reporting Information [Line Items]
Net revenues	342,922	328,836	695,794	659,739
Cost of revenues	90,357	97,831	186,195	198,303
Gross margin	252,565	231,005	509,599	461,436
Ethernet products
Segment Reporting Information [Line Items]
Net revenues	113,182	128,659	236,612	254,785
Cost of revenues	73,820	73,244	153,389	150,388
Gross margin	39,362	55,415	83,223	104,397
Global Services
Segment Reporting Information [Line Items]
Net revenues	87,335	90,869	171,675	179,596
Cost of revenues	42,180	48,680	82,646	95,937
Gross margin	$ 45,155	$ 42,189	$ 89,029	$ 83,659