Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Oct. 31, 2014
Assets:
U.S. government obligations	$ 200,307us-gaap_AvailableForSaleSecurities
Fair Value, Measurements, Recurring
Assets:
Money market funds	411,477	440,013
U.S. government obligations	170,321	160,268
Commercial paper	94,981	89,989
Foreign currency forward contracts	654	1,561
Total assets measured at fair value	677,433	691,831
Liabilities:
Foreign currency forward contracts	5,241	200
Forward starting interest rate swap	5,241	200
Total liabilities measured at fair value	9,889	2,283
Fair Value, Measurements, Recurring \| Level 1
Assets:
Money market funds	411,477	440,013
Total assets measured at fair value	411,477	440,013
Liabilities:
Total liabilities measured at fair value	0	0
Fair Value, Measurements, Recurring \| Level 2
Assets:
U.S. government obligations	170,321	160,268
Commercial paper	94,981	89,989
Foreign currency forward contracts	654	1,561
Total assets measured at fair value	265,956	251,818
Liabilities:
Foreign currency forward contracts	5,241	200
Forward starting interest rate swap	5,241	200
Total liabilities measured at fair value	9,889	2,283
Fair Value, Measurements, Recurring \| Level 3
Assets:
Total assets measured at fair value	0	0
Liabilities:
Total liabilities measured at fair value	0	0
Interest Rate Swap \| Designated as Hedging Instrument \| Cash Flow Hedging \| Fair Value, Measurements, Recurring
Liabilities:
Foreign currency forward contracts	4,648	2,083
Forward starting interest rate swap	4,648	2,083
Interest Rate Swap \| Designated as Hedging Instrument \| Cash Flow Hedging \| Fair Value, Measurements, Recurring \| Level 2
Liabilities:
Foreign currency forward contracts	4,648	2,083
Forward starting interest rate swap	$ 4,648	$ 2,083

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 320

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-Section 50

-Paragraph 5

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 45

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Unsecured short-term debt instrument issued by corporations which are highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 5

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- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

No definition available.

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Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

+ References

No definition available.

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- Definition

Fair value of financial and nonfinancial obligations.

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- Definition

Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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