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Preferred And Common Stock (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended |  | 12 Months Ended
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Jun. 30, 2009 | Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2010 | Apr. 30, 2012 Director Stock Plan [Member] | Apr. 30, 2012 Stock Options [Member] | Apr. 30, 2010 Stock Options [Member] | Apr. 30, 2011 Stock Options [Member] | Apr. 30, 2009 Stock Options [Member] | Jun. 30, 2011 Restricted Stock Units (RSUs) [Member] | Apr. 30, 2012 Restricted Stock Units (RSUs) [Member] | Apr. 30, 2011 Restricted Stock Units (RSUs) [Member] | Apr. 30, 2010 Restricted Stock Units (RSUs) [Member] | Apr. 30, 2009 Restricted Stock Units (RSUs) [Member] | Apr. 30, 2012 Plan And Prior Plan [Member] | Apr. 30, 2012 Non-Employee, Certain Officers, Key Employees [Member] | May 31, 2009 Non-Employee [Member] | Sep. 30, 2011 Non-Employee [Member] Restricted Stock Units (RSUs) [Member] | Mar. 31, 2011 Non-Employee [Member] Restricted Stock Units (RSUs) [Member] | Jun. 30, 2010 Non-Employee [Member] Restricted Stock Units (RSUs) [Member] | Jun. 30, 2011 Certain Officers And Key Employees [Member] | Jun. 30, 2009 Certain Officers And Key Employees [Member] | Jun. 30, 2011 Certain Employees [Member] Restricted Stock Units (RSUs) [Member] | Jun. 30, 2011 Chief Executive Officer [Member] Restricted Stock Units (RSUs) [Member] | Apr. 30, 2012 Series A Preferred Stock [Member] | Apr. 30, 2012 Minimum [Member] | Apr. 30, 2012 Maximum [Member]
Preferred And Common Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |
Common stock, shares authorized |  | 120,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price of 1/1000th of Series A share |  | $ 95.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares available for grant |  | 4,428,604 |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  | 5,260,000 |  |  |  |  |  |  |  |  |  |  |
Stock options outstanding |  |  |  |  |  | 1,053,509 | 959,550 | 775,109 | 678,000 |  | 66,198 | 28,000 |  |  |  | 1,053,509 |  |  |  |  |  |  |  |  |  |  |
Stock granted |  |  |  |  |  | 441,000 | 377,000 |  |  | 15,000 | 38,198 | 28,000 |  |  |  |  | 16,000 | 14,000 | 14,000 | 14,000 | 441,000 | 361,000 | 9,198 |  |  |  |
Stock options, expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2013 | 2021
Date vested | 2012-06-23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2012-05-01 | 2011-05-01 |  | 2012-06-23 |  | 2014-06-10 | June 23, 2014 |  |  |
Aggregate intrinsic value of options outstanding |  | $ 25,029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of options outstanding (years) |  | 7 years 2 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested |  | 276,009 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price of options vested |  | $ 22.82 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of vested options (years) |  | 5 years 9 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options vested |  | 9,255 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercised |  | 4,565 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of shares granted |  | 6,461 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total compensation costs |  | 3,792 | 2,066 | 2,031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,894 |  |  |  |  |  |  |  |  |  |  |  |

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