Unrealized gain on foreign currency derivatives, foreign exchange receivable

No definition available.

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- Definition

Unrealized loss on foreign currency derivatives, foreign exchange payable

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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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. Fair value of convertible debt at the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Convertible Security

-URI http://asc.fasb.org/extlink&oid=6509036

+ Details

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Fair Value Of Financial Instruments (Details) (USD $)					9 Months Ended
Fair Value Of Financial Instruments (Details) (USD $)	Oct. 31, 2011	Oct. 31, 2011 Convertible Senior Debentures [Member]	Jan. 31, 2011 Convertible Senior Debentures [Member]	Dec. 31, 2006 Convertible Senior Debentures [Member]	Oct. 31, 2011 Derivatives Not Designated As Hedging Instruments [Member]	Oct. 31, 2010 Derivatives Not Designated As Hedging Instruments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net unrealized gain on foreign currency forward contracts					$ 8,600,000	$ 7,000,000
Net unrealized loss on foreign currency forward contracts					11,900,000	5,300,000
Convertible senior debentures, face value		350,000,000	350,000,000	350,000,000
Fair value of the convertible senior debentures	$ 354,400,000