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Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands | Jan. 31, 2017 | Oct. 31, 2016
--- | --- | ---
Cash equivalents |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | $ 190,851 | $ 504,972
Gross unrealized gains | 0 | 0
Gross unrealized losses less than 12 months | 0 | 0
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 190,851 | 504,972
Cash equivalents | Money market funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 188,002 | 499,274
Gross unrealized gains | 0 | 0
Gross unrealized losses less than 12 months | 0 | 0
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 188,002 | 499,274
Cash equivalents | Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 2,849 | 1,498
Gross unrealized gains | 0 | 0
Gross unrealized losses less than 12 months | 0 | 0
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 2,849 | 1,498
Cash equivalents | Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost |  | 4,200
Gross unrealized gains |  | 0
Gross unrealized losses less than 12 months |  | 0
Gross unrealized losses 12 months or longer |  | 0
Estimated fair value |  | 4,200
Short-term investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 138,691 | 140,676
Gross unrealized gains | 37 | 60
Gross unrealized losses less than 12 months | (80) | (41)
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 138,648 | 140,695
Short-term investments | Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 24,831 | 25,430
Gross unrealized gains | 1 | 1
Gross unrealized losses less than 12 months | 0 | 0
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 24,832 | 25,431
Short-term investments | U.S. government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 12,305 | 13,607
Gross unrealized gains | 0 | 4
Gross unrealized losses less than 12 months | (25) | (8)
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 12,280 | 13,603
Short-term investments | Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 20,963 | 12,849
Gross unrealized gains | 0 | 0
Gross unrealized losses less than 12 months | 0 | 0
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 20,963 | 12,849
Short-term investments | Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 53,806 | 58,753
Gross unrealized gains | 29 | 43
Gross unrealized losses less than 12 months | (36) | (18)
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 53,799 | 58,778
Short-term investments | Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 18,978 | 22,146
Gross unrealized gains | 7 | 12
Gross unrealized losses less than 12 months | (18) | (12)
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 18,967 | 22,146
Short-term investments | Non-U.S. government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 3,401 | 3,403
Gross unrealized gains | 0 | 0
Gross unrealized losses less than 12 months | (1) | (3)
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 3,400 | 3,400
Short-term investments | Others |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 4,407 | 4,488
Gross unrealized gains | 0 | 0
Gross unrealized losses less than 12 months | 0 | 0
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | $ 4,407 | $ 4,488

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