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Financial Assets and Liabilities - Short-term investments (Details) - USD ($) $ in Thousands | Jul. 31, 2016 | Oct. 31, 2015
--- | --- | ---
Cash equivalents |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  | $ 405,470 | $ 239,473
Gross unrealized gains |  | 0 | 0
Gross unrealized losses less than 12 months |  | 0 | (1)
Gross unrealized losses 12 months or longer |  | 0 | 0
Estimated fair value | [1] | 405,470 | 239,472
Cash equivalents | Money market funds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  | 403,070 | 233,839
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] | 403,070 | 233,839
Cash equivalents | Commercial paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  |  | 1,834
Gross unrealized gains |  |  | 0
Gross unrealized losses less than 12 months |  |  | 0
Gross unrealized losses 12 months or longer |  |  | 0
Estimated fair value | [1] |  | 1,834
Cash equivalents | Certificates of deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  | 2,400 | 3,500
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] | 2,400 | 3,500
Cash equivalents | Asset-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  |  | 300
Gross unrealized gains |  |  | 0
Gross unrealized losses less than 12 months |  |  | (1)
Gross unrealized losses 12 months or longer |  |  | 0
Estimated fair value | [1] |  | 299
Short-term investments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  | 143,478 | 128,774
Gross unrealized gains |  | 82 | 33
Gross unrealized losses less than 12 months |  | (18) | (60)
Gross unrealized losses 12 months or longer |  | 0 | 0
Estimated fair value | [1] | 143,542 | 128,747
Short-term investments | Commercial paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  | 20,682 | 12,129
Gross unrealized gains |  | 0 | 0
Gross unrealized losses less than 12 months |  | (1) | 0
Gross unrealized losses 12 months or longer |  | 0 | 0
Estimated fair value | [1] | 20,681 | 12,129
Short-term investments | U.S. government agency securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  | 17,011 | 12,615
Gross unrealized gains |  | 9 | 3
Gross unrealized losses less than 12 months |  | (1) | (4)
Gross unrealized losses 12 months or longer |  | 0 | 0
Estimated fair value | [1] | 17,019 | 12,614
Short-term investments | Municipal bonds |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  | 700 | 1,403
Gross unrealized gains |  | 0 | 1
Gross unrealized losses less than 12 months |  | 0 | (1)
Gross unrealized losses 12 months or longer |  | 0 | 0
Estimated fair value | [1] | 700 | 1,403
Short-term investments | Certificates of deposit |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  | 17,500 | 9,800
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] | 17,500 | 9,800
Short-term investments | Corporate debt securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  | 61,245 | 67,201
Gross unrealized gains |  | 62 | 27
Gross unrealized losses less than 12 months |  | (6) | (40)
Gross unrealized losses 12 months or longer |  | 0 | 0
Estimated fair value | [1] | 61,301 | 67,188
Short-term investments | Asset-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  | 20,430 | 24,619
Gross unrealized gains |  | 11 | 2
Gross unrealized losses less than 12 months |  | (10) | (13)
Gross unrealized losses 12 months or longer |  | 0 | 0
Estimated fair value | [1] | 20,431 | 24,608
Short-term investments | Non-U.S. government agency securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  | 1,003 | 1,007
Gross unrealized gains |  | 0 | 0
Gross unrealized losses less than 12 months |  | 0 | (2)
Gross unrealized losses 12 months or longer |  | 0 | 0
Estimated fair value | [1] | 1,003 | $ 1,005
Short-term investments | Other |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale securities, cost |  | 4,907 |
Gross unrealized gains |  | 0 |
Gross unrealized losses less than 12 months |  | 0 |
Gross unrealized losses 12 months or longer |  | 0 |
Estimated fair value | [1] | $ 4,907 |
[1] | See Note 6. Fair Value Measures for further discussion on fair values of cash equivalents and short-term investments.

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