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Summary of Significant Accounting Policies - Schedule of Topic 606 Impact Income Statement (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Apr. 30, 2019
Jan. 31, 2019
Apr. 30, 2018
Jan. 31, 2018
Apr. 30, 2019
Apr. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Total revenue $ 836,242   $ 776,836   $ 1,656,643 $ 1,546,262
Amortization of intangible assets 14,881   20,450   32,324 39,458
Total cost of revenue 190,679   178,779   383,571 359,935
Gross margin 645,563   598,057   1,273,072 1,186,327
Research and development 290,299   252,134   561,625 516,545
Sales and marketing 158,652   147,188   314,611 297,700
General and administrative 56,351   58,809   98,412 115,181
Amortization of intangible assets 10,316   10,736   21,100 20,275
Restructuring 14,443   2,176   14,408 1,894
Total operating expenses 530,061   471,043   1,010,156 951,595
Operating income 115,502   127,014   262,916 234,732
Other income (expense), net 18,415   (7,715)   18,056 4,670
Income before income taxes 133,917   119,299   280,972 239,402
Provision (benefit) for income taxes 15,707   16,827   9,248 140,621
Net income $ 118,210 $ 153,514 $ 102,472 $ (3,691) $ 271,724 $ 98,781
Basic (in USD per share) $ 0.79   $ 0.69   $ 1.82 $ 0.66
Diluted (in USD per share) $ 0.77   $ 0.67   $ 1.77 $ 0.64
Basic (shares) 149,712   149,034   149,500 149,245
Diluted (shares) 153,904   153,167   153,383 153,664
Time-based products            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Total revenue $ 558,305   $ 556,770   $ 1,112,021 $ 1,127,703
Cost of revenue 116,010   108,199   232,630 219,593
Upfront products            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Total revenue 143,401   99,960   273,914 191,564
Maintenance and service            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Total revenue 134,536   120,106   270,708 226,995
Cost of revenue 59,788   $ 50,130   118,617 $ 100,884
Adjustments | Accounting Standards Update 2014-09            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Total revenue 16,326       (6,018)  
Amortization of intangible assets 0       0  
Total cost of revenue 0       0  
Gross margin 16,326       (6,018)  
Research and development 0       0  
Sales and marketing 1,942       13,126  
General and administrative 0       0  
Amortization of intangible assets 0       0  
Restructuring 0       0  
Total operating expenses 1,942       13,126  
Operating income 14,384       (19,144)  
Other income (expense), net 0       0  
Income before income taxes 14,384       (19,144)  
Provision (benefit) for income taxes 2,599       (3,071)  
Net income $ 11,785       $ (16,073)  
Basic (in USD per share) $ 0.08       $ (0.11)  
Diluted (in USD per share) $ 0.07       $ (0.10)  
Adjustments | Accounting Standards Update 2014-09 | Time-based products            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Total revenue $ 86,762       $ 102,618  
Cost of revenue 0       0  
Adjustments | Accounting Standards Update 2014-09 | Upfront products            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Total revenue (61,057)       (77,843)  
Adjustments | Accounting Standards Update 2014-09 | Maintenance and service            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Total revenue (9,379)       (30,793)  
Cost of revenue 0       0  
Adjusted balance under ASC 605            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Total revenue 852,568       1,650,625  
Amortization of intangible assets 14,881       32,324  
Total cost of revenue 190,679       383,571  
Gross margin 661,889       1,267,054  
Research and development 290,299       561,625  
Sales and marketing 160,594       327,737  
General and administrative 56,351       98,412  
Amortization of intangible assets 10,316       21,100  
Restructuring 14,443       14,408  
Total operating expenses 532,003       1,023,282  
Operating income 129,886       243,772  
Other income (expense), net 18,415       18,056  
Income before income taxes 148,301       261,828  
Provision (benefit) for income taxes 18,306       6,177  
Net income $ 129,995       $ 255,651  
Basic (in USD per share) $ 0.87       $ 1.71  
Diluted (in USD per share) $ 0.84       $ 1.67  
Basic (shares) 149,712       149,500  
Diluted (shares) 153,904       153,383  
Adjusted balance under ASC 605 | Time-based products            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Total revenue $ 645,067       $ 1,214,639  
Cost of revenue 116,010       232,630  
Adjusted balance under ASC 605 | Upfront products            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Total revenue 82,344       196,071  
Adjusted balance under ASC 605 | Maintenance and service            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Total revenue 125,157       239,915  
Cost of revenue $ 59,788       $ 118,617