Segment Disclosure - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 1,057,130	$ 964,134	$ 3,051,774	$ 2,659,842
Adjusted operating income	201,923	210,598	544,502	424,009
Operating Segments
Segment Reporting Information [Line Items]
Adjusted operating income	$ 337,396	$ 323,553	$ 941,456	$ 731,890
Adjusted operating margin	32.00%	34.00%	31.00%	28.00%
Operating Segments | Semiconductor & System Design:
Segment Reporting Information [Line Items]
Total revenue	$ 959,155	$ 870,734	$ 2,767,950	$ 2,392,542
Adjusted operating income	$ 328,742	$ 308,730	$ 916,434	$ 697,273
Adjusted operating margin	34.00%	35.00%	33.00%	29.00%
Operating Segments | Software Integrity:
Segment Reporting Information [Line Items]
Total revenue	$ 97,975	$ 93,400	$ 283,824	$ 267,300
Adjusted operating income	$ 8,654	$ 14,823	$ 25,022	$ 34,617
Adjusted operating margin	9.00%	16.00%	9.00%	13.00%