Segment Disclosure - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 836,242	$ 776,836	$ 1,656,643	$ 1,546,262
Adjusted operating income	115,502	127,014	262,916	234,732
Operating Segments
Segment Reporting Information [Line Items]
Adjusted operating income	$ 209,836	$ 190,116	$ 410,788	$ 386,062
Adjusted operating margin	25.00%	24.00%	25.00%	25.00%
Operating Segments | Semiconductor & System Design:
Segment Reporting Information [Line Items]
Total revenue	$ 753,055	$ 709,034	$ 1,490,961	$ 1,414,367
Adjusted operating income	$ 201,406	$ 195,741	$ 396,724	$ 394,857
Adjusted operating margin	27.00%	28.00%	27.00%	28.00%
Operating Segments | Adjusted operating margin
Segment Reporting Information [Line Items]
Total revenue	$ 83,187	$ 67,802	$ 165,682	$ 131,895
Adjusted operating income	$ 8,430	$ (5,625)	$ 14,064	$ (8,795)
Adjusted operating margin	10.00%	(8.00%)	8.00%	(7.00%)