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Recently Issued Accounting Pronouncements	3 Months Ended
	Apr. 30, 2011
Recently Issued Accounting Pronouncements
Recently Issued Accounting Pronouncements	2. Recently Issued Accounting Pronouncements In January 2010, the Financial Accounting Standards Board issued an accounting standards update that amended fair value measurements and disclosures and aimed to improve the transparency of financial reporting of assets and liabilities measured at fair value. The update required new disclosures for transfers in and out of Level 1 and Level 2 and the basis for such transfers. Also required are disclosures for activity in Level 3, including purchase, sale, issuance and settlement information. Lastly, it clarified guidance regarding disaggregation and disclosure of information about valuation techniques and inputs used to measure fair value for both recurring and non-recurring fair value measurements in Level 2 and Level 3 categories. We adopted the provisions of this accounting standards update effective February 1, 2010, except for the requirement to disclose purchases, sales, issuances, and settlements related to Level 3 measurements, which we adopted February 1, 2011. This adoption had no impact on our financial condition, results of operations or cash flows.

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Notes to Financial Statements [Abstract]

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Represents disclosure of any changes in an accounting principle, including a change from one generally accepted accounting principle to another generally accepted accounting principle when there are two or more generally accepted accounting principles that apply or when the accounting principle formerly used is no longer generally accepted. Also disclose any change in the method of applying an accounting principle, or any change in an accounting principle required by a new pronouncement in the unusual instance that a new pronouncement does not include specific transition provisions.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 154
-Paragraph 2, 17, 18

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 28
-Paragraph 23, 24

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 01
-Paragraph b
-Subparagraph 6
-Article 10

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