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Equity Compensation Plans (Narrative) (Details) (USD $)
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3 Months Ended | |
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Aug. 31, 2011
years
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Aug. 31, 2010
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| Compensation expense | $ 600,000 | $ 675,000 |
| Weighted-average fair value of stock options granted | $ 8.66 | |
| Warrant life, years | 5 | |
| Warrants outstanding | 6,750 | |
| Employee stock purchases discount | 5.00% | |
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Employee And Director Stock Option [Member]
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| Stock options grant period, years | 5 | |
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Non-Qualified Options [Member]
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| Stock options grant period, years | 10 | |
| X | ||||||||||
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- Definition
Warrant expiration term
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| X | ||||||||||
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- Definition
Warrants outstanding
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| X | ||||||||||
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- Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Description of the estimated period of time over which an employee is required to provide service in exchange for the equity-based payment award, which often is the vesting period. This period may be explicit or implicit based on the terms of the award, and may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The discount rate from market value on purchase date that participants pay for shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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