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Employee Stock Plans (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2012 | Jan. 31, 2011 | Jan. 31, 2012 | Jan. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Additional common stock for stock-based compensation awards |  |  | 2,360,000 |
Shares repurchased during the period |  |  |  | 724,064
Common stock repurchased, value |  |  |  | $ 10,600,000
Stock issued for stock options exercised | 22,523 | 378,705 | 138,709 | 471,782
Warrants exercised, cash |  |  |  | 2,983,000
Stock-based compensation expense | 3,316,000 | 3,969,000 | 9,913,000 | 11,775,000
Stock Options And SARs [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation cost related to non-vested awards of restricted stock | 2,100,000 |  | 2,100,000 |
Expected cost recognized over weighted-average period |  |  | 1.2 |
Stock issued for stock options exercised |  |  | 144,000 |
Stock-based compensation expense | 264,000 | 400,000 | 709,000 | 847,000
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized compensation cost related to non-vested awards of restricted stock | 20,600,000 |  | 20,600,000 |
Expected cost recognized over weighted-average period |  |  | 2.0 |
Shares repurchased during the period | 1,151 | 1,378 | 184,101 | 192,369
Common stock repurchased, value | 100,000 | 100,000 | 4,200,000 | 2,800,000
Vesting period (years) market based |  |  | three |
Vesting period minimum (years) time based |  |  | three |
Vesting period maximum (years) time based |  |  | four |
Stock-based compensation expense | 3,198,000 | 3,481,000 | 9,119,000 | 10,633,000
ESPP [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized payroll deductions | 15.00% |  | 15.00% |
Authorized payroll deductions, value |  |  | 25,000 |
Fair market price of common stock |  |  | 85.00% |
Maximum number of shares of common stock reserved for ESPP issuance | 3,000,000 |  | 3,000,000 |
Employees stock purchased |  | 45,488 | 76,909 | 153,913
Employees stock purchased, per share value |  | $ 19.64 | $ 18.69 | $ 14.13
Original shares reserved for issuance | 1,500,000 |  | 1,500,000 |
Amended shares reserved for issuance | 3,000,000 |  | 3,000,000 |
Shares available for future issuance | 1,600,000 |  | 1,600,000 |
Stock-based compensation expense | $ (146,000) | $ 88,000 | $ 85,000 | $ 295,000
Warrant [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Warrant date issued |  |  | Jun. 30, 2002 |
Warrants issued | 274,207 |  | 274,207 |
Common stock at an exercise price | $ 11.94 |  | $ 11.94 |
Shares of common stock issued in exchange for warrants |  | 274,207 |  | 274,207

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