Stock Compensation Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Jul. 31, 2013	Jul. 31, 2012
Stock Compensation Information [Abstract]
Cost recognition, weighted-average period, years	1 year 7 months 6 days
Pricing model expected dividend yield	0.00%
Forfeiture rate	20.00%	20.00%
Awards exercised during the period
Fair value of awards vested	$ 0.1	$ 0.2
Fair value of awards granted	$ 0.1	$ 0.4

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Option Pricing Model Expected Dividend Yield

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award Options Granted In Period Weighted Average Fair Value

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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- Definition

Number of share options (or share units) exercised during the current period.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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