Industry Segment Operations (Net Sales and Operating Income (Loss)) (Details) - Semiconductor Systems - Net sales	12 Months Ended
	Oct. 25, 2020	Oct. 27, 2019	Oct. 28, 2018
Segment Reporting Information [Line Items]
Percentage of net sales	100.00%	100.00%	100.00%
Foundry, logic and other
Segment Reporting Information [Line Items]
Percentage of net sales	59.00%	52.00%	36.00%
Dynamic random-access memory (DRAM)
Segment Reporting Information [Line Items]
Percentage of net sales	20.00%	22.00%	27.00%
Flash memory
Segment Reporting Information [Line Items]
Percentage of net sales	21.00%	26.00%	37.00%