This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 12
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Available-for-Sale Securities
-URI http://asc.fasb.org/extlink&oid=6505594

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- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

+ Details

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Period Type:	instant

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ Details

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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- Definition

Issues that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (c)(2)
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- Definition

Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
-Paragraph 2
-Subparagraph (c)(3)
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Period Type:	duration

- Definition

Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period.

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-Name Accounting Standards Codification
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-Paragraph 2
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Balance Type:	credit
Period Type:	duration

- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph 32
-Subparagraph c
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+ Details

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Fair Value Measurements (Details) (USD $) In Thousands	9 Months Ended
Fair Value Measurements (Details) (USD $) In Thousands	Jul. 31, 2011	Oct. 31, 2010
Assets:
Derivative Assets	$ 7,600	$ 4,220
Reconciliation of changes in Level 3 fair value measurements
Balance at October 31, 2010	34,415
Issuances	0
Settlement	(30,915)
Changes in unrealized gain (loss)	3,380
Transfers into Level 3	0
Transfers out of Level 3	0
Balance at July 31, 2011	7,600
Fair Value, Measurements, Recurring [Member]
Assets:
Total assets measured at fair value	57,964
Fair Value, Measurements, Recurring [Member] \| U.S. government obligations [Member]
Assets:
U.S. government obligations	50,227
Fair Value, Measurements, Recurring [Member] \| U.S. government obligations [Member] \| Level 1 [Member]
Assets:
U.S. government obligations	50,227
Fair Value, Measurements, Recurring [Member] \| U.S. government obligations [Member] \| Level 2 [Member]
Assets:
U.S. government obligations	0
Fair Value, Measurements, Recurring [Member] \| U.S. government obligations [Member] \| Level 3 [Member]
Assets:
U.S. government obligations	0
Fair Value, Measurements, Recurring [Member] \| Foreign Exchange Forward [Member]
Assets:
Derivative Assets	137
Fair Value, Measurements, Recurring [Member] \| Foreign Exchange Forward [Member] \| Level 1 [Member]
Assets:
Derivative Assets	0
Fair Value, Measurements, Recurring [Member] \| Foreign Exchange Forward [Member] \| Level 2 [Member]
Assets:
Derivative Assets	137
Fair Value, Measurements, Recurring [Member] \| Foreign Exchange Forward [Member] \| Level 3 [Member]
Assets:
Derivative Assets	0
Fair Value, Measurements, Recurring [Member] \| Embedded redemption feature [Member]
Assets:
Derivative Assets	7,600
Fair Value, Measurements, Recurring [Member] \| Embedded redemption feature [Member] \| Level 1 [Member]
Assets:
Derivative Assets	0
Fair Value, Measurements, Recurring [Member] \| Embedded redemption feature [Member] \| Level 2 [Member]
Assets:
Derivative Assets	0
Fair Value, Measurements, Recurring [Member] \| Embedded redemption feature [Member] \| Level 3 [Member]
Assets:
Derivative Assets	7,600
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Assets:
Total assets measured at fair value	50,227
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Assets:
Total assets measured at fair value	137
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Assets:
Total assets measured at fair value	$ 7,600