Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue (Details)	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue percentage by product group	100.00%	100.00%	100.00%	100.00%
EDA
Disaggregation of Revenue [Line Items]
Revenue percentage by product group	58.00%	62.00%	59.00%	63.00%
IP & System Integration
Disaggregation of Revenue [Line Items]
Revenue percentage by product group	31.00%	29.00%	30.00%	29.00%
Software Integrity Products & Services
Disaggregation of Revenue [Line Items]
Revenue percentage by product group	10.00%	9.00%	10.00%	8.00%
Other
Disaggregation of Revenue [Line Items]
Revenue percentage by product group	1.00%	0.00%	1.00%	0.00%