Segment Disclosure - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 834,381	$ 820,401
Adjusted operating income	87,516	147,414
Operating Segments
Segment Reporting Information [Line Items]
Adjusted operating income	$ 186,933	$ 200,952
Adjusted operating margin	22.00%	24.00%
Operating Segments | Semiconductor & System Design:
Segment Reporting Information [Line Items]
Total revenue	$ 748,744	$ 737,906
Adjusted operating income	$ 178,851	$ 195,317
Adjusted operating margin	24.00%	26.00%
Operating Segments | Software Integrity:
Segment Reporting Information [Line Items]
Total revenue	$ 85,637	$ 82,495
Adjusted operating income	$ 8,082	$ 5,635
Adjusted operating margin	9.00%	7.00%