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Segment Disclosure - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 852,970	$ 779,714	$ 2,509,613	$ 2,325,976
Adjusted operating income	127,594	63,968	390,510	298,700
Operating Segments
Segment Reporting Information [Line Items]
Adjusted operating income	$ 216,581	$ 167,847	$ 627,369	$ 553,909
Adjusted operating margin	25.00%	22.00%	25.00%	24.00%
Operating Segments | Semiconductor & System Design:
Segment Reporting Information [Line Items]
Total revenue	$ 769,411	$ 708,413	$ 2,260,372	$ 2,122,780
Adjusted operating income	$ 207,773	$ 169,798	$ 604,497	$ 564,656
Adjusted operating margin	27.00%	24.00%	27.00%	27.00%
Operating Segments | Adjusted operating margin
Segment Reporting Information [Line Items]
Total revenue	$ 83,559	$ 71,301	$ 249,241	$ 203,196
Adjusted operating income	$ 8,808	$ (1,951)	$ 22,872	$ (10,747)
Adjusted operating margin	11.00%	(3.00%)	9.00%	(5.00%)

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