Shareholders' Equity (Details) (USD $)	3 Months Ended
Jul. 30, 2011	Apr. 30, 2011	Jul. 31, 2010
Dividend declared date	Nov. 17, 2009
Dividend payable, record date	Nov. 27, 2009
Common stock, par value	$ 0.001	$ 0.001	$ 0.001
Proportion of preferred stock in common stock	0.001
Preferred stock price per share	$ 100.00
Rights expiry date	November 17, 2012
Percent of assets sold to acquiring entity, threshold for discounted share purchase	50.00%
Rate of discounted share purchase	50.00%
Current beneficial ownership threshold percentage	20.00%
Proposed beneficial ownership threshold percentage	30.00%
Series I Preferred Stock [Member]
Preferred stock, par value	$ 0.001

Current Beneficial Ownership Threshold Percentage

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Percent of Assets Sold to Acquiring Entity, Threshold for Discounted Share Purchase

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Proportion Of Preferred Stock In Common Stock

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Proposed Beneficial Ownership Threshold Percentage

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Rate of Discounted Share Purchase

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Rights expiry date

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- Definition

Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

+ References

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
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-Number 129
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The day, month and year (YYYY-MM-DD) that the dividend to be paid was declared.

+ References

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The date as of when a holder must own the stock to be entitled to the dividend. The ex-dividend date is generally 3 days before the record date.

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Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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