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Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands | Apr. 30, 2017 | Oct. 31, 2016
--- | --- | ---
Cash equivalents |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | $ 400,189 | $ 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 | 400,189 | 504,972
Cash equivalents | Money market funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 392,191 | 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 | 392,191 | 499,274
Cash equivalents | Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 3,448 | 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 | 3,448 | 1,498
Cash equivalents | U.S. government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 2,000 |
Gross unrealized gains | 0 |
Gross unrealized losses less than 12 months | 0 |
Gross unrealized losses 12 months or longer | 0 |
Estimated fair value | 2,000 |
Cash equivalents | Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 1,000 | 4,200
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 | 1,000 | 4,200
Cash equivalents | Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 1,550 |
Gross unrealized gains | 0 |
Gross unrealized losses less than 12 months | 0 |
Gross unrealized losses 12 months or longer | 0 |
Estimated fair value | 1,550 |
Short-term investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 140,277 | 140,676
Gross unrealized gains | 44 | 60
Gross unrealized losses less than 12 months | (78) | (41)
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 140,243 | 140,695
Short-term investments | Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 23,472 | 25,430
Gross unrealized gains | 0 | 1
Gross unrealized losses less than 12 months | 0 | 0
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 23,472 | 25,431
Short-term investments | U.S. government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 16,494 | 13,607
Gross unrealized gains | 0 | 4
Gross unrealized losses less than 12 months | (34) | (8)
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 16,460 | 13,603
Short-term investments | Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 21,214 | 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 | 21,214 | 12,849
Short-term investments | Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 57,469 | 58,753
Gross unrealized gains | 39 | 43
Gross unrealized losses less than 12 months | (29) | (18)
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 57,479 | 58,778
Short-term investments | Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 20,829 | 22,146
Gross unrealized gains | 5 | 12
Gross unrealized losses less than 12 months | (15) | (12)
Gross unrealized losses 12 months or longer | 0 | 0
Estimated fair value | 20,819 | 22,146
Short-term investments | Non-U.S. government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost |  | 3,403
Gross unrealized gains |  | 0
Gross unrealized losses less than 12 months |  | (3)
Gross unrealized losses 12 months or longer |  | 0
Estimated fair value |  | 3,400
Short-term investments | Others |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, cost | 799 | 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 | $ 799 | $ 4,488

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