Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 171

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 13, 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6508534

+ Details

Earnings Per Share ("EPS") (Narrative) (Details) (USD $)	9 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011 Convertible Senior Debentures [Member]	Jan. 31, 2011 Convertible Senior Debentures [Member]	Dec. 31, 2006 Convertible Senior Debentures [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Equity-based compensation awards, excluded from computation of dilutive earnings per share	35,181	1,144,042
Convertible senior debentures, issuance date			December 2006
Convertible senior debentures, face value			$ 350,000,000	$ 350,000,000	$ 350,000,000
Debt, maturity date			Dec. 01, 2026