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Segment Disclosure - Reportable Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 3,360,694	$ 3,121,058	$ 2,724,880
Adjusted operating income	520,231	360,225	347,563
Operating Segments
Segment Reporting Information [Line Items]
Adjusted operating income	$ 838,821	$ 690,681	$ 647,255
Adjusted operating margin	25.00%	22.00%	24.00%
Operating Segments | Semiconductor And System Design
Segment Reporting Information [Line Items]
Revenues	$ 3,026,097	$ 2,840,589	$ 2,551,130
Adjusted operating income	$ 806,618	$ 701,283	$ 667,164
Adjusted operating margin	27.00%	25.00%	26.00%
Operating Segments | Software Integrity
Segment Reporting Information [Line Items]
Revenues	$ 334,597	$ 280,469	$ 173,750
Adjusted operating income	$ 32,203	$ (10,602)	$ (19,909)
Adjusted operating margin	10.00%	(4.00%)	(11.00%)

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