Segment Disclosure - Reportable Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 4,204,193	$ 3,685,281	$ 3,360,694
Adjusted operating income	734,790	620,141	520,231
Operating Segments
Segment Reporting Information [Line Items]
Revenues	4,204,193	3,685,281	3,360,694
Adjusted operating income	$ 1,281,389	$ 1,031,630	$ 838,821
Adjusted operating margin	30.00%	28.00%	25.00%
Operating Segments | Semiconductor And System Design
Segment Reporting Information [Line Items]
Revenues	$ 3,810,409	$ 3,327,211	$ 3,026,097
Adjusted operating income	$ 1,243,078	$ 990,837	$ 806,618
Adjusted operating margin	33.00%	30.00%	27.00%
Operating Segments | Software Integrity
Segment Reporting Information [Line Items]
Revenues	$ 393,784	$ 358,070	$ 334,597
Adjusted operating income	$ 38,311	$ 40,793	$ 32,203
Adjusted operating margin	10.00%	11.00%	10.00%