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Preferred And Common Stock (Tables) | 12 Months Ended
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Apr. 30, 2012
Preferred And Common Stock [Abstract] |
Stock Option Activity |
| Number of |  |  |  |  | Weighted
| restricted |  | Number of |  |  | average option
| stock units |  | option shares |  |  | exercise price
Balance at April 30, 2009 | - |  | 678,000 |  | $ | 20.45
Granted | - |  | 377,000 |  |  | 25.27
Exercised | - |  | (83,450) |  |  | 14.85
Forfeited | - |  | (12,000) |  |  | 24.41
Balance at April 30, 2010 | - |  | 959,550 |  | $ | 22.78
Granted | 28,000 |  | - |  |  | 0.00
Exercised | - |  | (184,441) |  |  | 20.24
Forfeited | - |  | - |  |  | 0.00
Balance at April 30, 2011 | 28,000 |  | 775,109 |  | $ | 23.38
Granted | 38,198 |  | 441,000 |  |  | 44.39
Exercised | - |  | (159,600) |  |  | 20.36
Forfeited | - |  | (3,000) |  |  | 36.19
Balance at April 30, 2012 | 66,198 |  | 1,053,509 |  | $ | 32.59
Schedule Of Range Of Exercise Prices And Weighted Average Remaining Contractual Life Of Outstanding Options |
| Range of |  | Number |  |  | Weighted average |  | Weighted average remaining
| exercise prices |  | of shares |  |  | exercise price |  | contractual life (years)
$ | 11.86 – 17.64 |  | 45,500 |  | $ | 14.68 |  | 1.5
| 20.68 – 26.92 |  | 569,009 |  |  | 24.92 |  | 6.1
| 44.39 |  | 439,000 |  |  | 44.39 |  | 9.2
|  |  | 1,053,509 |  |  |  |  |

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- Definition Schedule Of Range Of Exercise Prices And Weighted Average Remaining Contractual Life Of Outstanding Options [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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