Segment Disclosure - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 1,024,323	$ 861,327	$ 1,994,644	$ 1,695,708
Adjusted operating income	194,231	125,895	342,579	213,411
Operating Segments
Segment Reporting Information [Line Items]
Adjusted operating income	$ 317,240	$ 221,404	$ 604,060	$ 408,337
Adjusted operating margin	31.00%	26.00%	30.00%	24.00%
Operating Segments | Semiconductor & System Design:
Segment Reporting Information [Line Items]
Total revenue	$ 930,427	$ 773,065	$ 1,808,795	$ 1,521,809
Adjusted operating income	$ 308,816	$ 209,692	$ 587,692	$ 388,543
Adjusted operating margin	33.00%	27.00%	32.00%	26.00%
Operating Segments | Software Integrity:
Segment Reporting Information [Line Items]
Total revenue	$ 93,896	$ 88,262	$ 185,849	$ 173,899
Adjusted operating income	$ 8,424	$ 11,712	$ 16,368	$ 19,794
Adjusted operating margin	9.00%	13.00%	9.00%	11.00%