Summary of Significant Accounting Policies - Schedule of Topic 606 Impact Income Statement (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	$ 3,360,694	$ 3,121,058	$ 2,724,880
Amortization of intangible assets	59,623	84,034	76,109
Total cost of revenue	752,946	735,898	654,184
Gross margin	2,607,748	2,385,160	2,070,696
Research and development	1,136,932	1,084,822	908,841
Sales and marketing	632,890	622,978	549,248
General and administrative	229,218	262,560	196,844
Amortization of intangible assets	41,291	41,630	31,614
Restructuring charges	47,186	12,945	36,586
Total operating expenses	2,087,517	2,024,935	1,723,133
Operating income	520,231	360,225	347,563
Other income (expense), net	25,275	3,318	35,535
Income before income taxes	545,506	363,543	383,098
Provision (benefit) for income taxes	13,139	(68,975)	246,535
Net income	$ 532,367	$ 432,518	$ 136,563
Basic (in USD per share)	$ 3.55	$ 2.90	$ 0.91
Diluted (in USD per share)	$ 3.45	$ 2.82	$ 0.88
Basic (shares)	149,872	149,036	150,457
Diluted (shares)	154,190	153,393	154,874
Products
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	$ 2,197,965	$ 2,303,317	$ 2,021,812
Cost of revenue	459,127	448,430	413,203
Upfront products
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	619,791	357,698	338,204
Maintenance and service
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	542,938	460,043	364,864
Cost of revenue	234,196	$ 203,434	$ 164,872
Adjustments | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	(102,531)
Amortization of intangible assets	0
Total cost of revenue	0
Gross margin	(102,531)
Research and development	0
Sales and marketing	4,121
General and administrative	0
Amortization of intangible assets	0
Restructuring charges	0
Total operating expenses	4,121
Operating income	(106,652)
Other income (expense), net	0
Income before income taxes	(106,652)
Provision (benefit) for income taxes	(18,499)
Net income	$ (88,153)
Basic (in USD per share)	$ (0.59)
Diluted (in USD per share)	$ (0.57)
Adjustments | Accounting Standards Update 2014-09 | Products
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	$ 206,904
Cost of revenue	0
Adjustments | Accounting Standards Update 2014-09 | Upfront products
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	(235,398)
Adjustments | Accounting Standards Update 2014-09 | Maintenance and service
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	(74,037)
Cost of revenue	0
Adjusted balance under ASC 605
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	3,258,163
Amortization of intangible assets	59,623
Total cost of revenue	752,946
Gross margin	2,505,217
Research and development	1,136,932
Sales and marketing	637,011
General and administrative	229,218
Amortization of intangible assets	41,291
Restructuring charges	47,186
Total operating expenses	2,091,638
Operating income	413,579
Other income (expense), net	25,275
Income before income taxes	438,854
Provision (benefit) for income taxes	(5,360)
Net income	$ 444,214
Basic (in USD per share)	$ 2.96
Diluted (in USD per share)	$ 2.88
Basic (shares)	149,872
Diluted (shares)	154,190
Adjusted balance under ASC 605 | Products
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	$ 2,404,869
Cost of revenue	459,127
Adjusted balance under ASC 605 | Upfront products
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	384,393
Adjusted balance under ASC 605 | Maintenance and service
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenue	468,901
Cost of revenue	$ 234,196