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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified | Total | Common Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income, Net [Member]
--- | --- | --- | --- | ---
Beginning Balance, Shares at Apr. 30, 2009 |  | 44,729 |  |
Beginning Balance at Apr. 30, 2009 | $ 459,637 | $ 368,430 | $ 84,922 | $ 6,285
Comprehensive income: |  |  |  |
Net income | 5,298 |  | 5,298 |
Other comprehensive income, net of tax: |  |  |  |
Foreign currency translation adjustments | 15,377 |  |  | 15,377
Defined benefit pension plan | (8,728) |  |  | (8,728)
Total comprehensive income | 11,947 |  |  |
Purchase of stock, shares |  | (226) |  |
Purchase of stock | (3,136) | (3,136) |  |
Issuance of stock (in shares) |  | 1,476 |  |
Issuance of stock | 6,526 | 6,526 |  |
Stock-based compensation | 17,508 | 17,508 |  |
Tax benefit (expense) from exercise of stock options | (611) | (611) |  |
Ending Balance, Shares at Apr. 30, 2010 |  | 45,979 |  |
Ending Balance at Apr. 30, 2010 | 491,871 | 388,717 | 90,220 | 12,934
Comprehensive income: |  |  |  |
Net income | 58,874 |  | 58,874 |
Other comprehensive income, net of tax: |  |  |  |
Foreign currency translation adjustments | 16,739 |  |  | 16,739
Defined benefit pension plan | (4,048) |  |  | (4,048)
Unrealized gains on marketable securities | 35 |  |  | 35
Total comprehensive income | 71,600 |  |  |
Exercise of warrants, Shares |  | 274 |  |
Exercise of warrants | 2,983 | 2,983 |  |
Purchase of stock, shares |  | (934) |  |
Purchase of stock | (13,844) | (13,844) |  |
Issuance of stock (in shares) |  | 1,684 |  |
Issuance of stock | 10,084 | 10,084 |  |
Stock-based compensation | 15,476 | 15,476 |  |
Tax benefit (expense) from exercise of stock options | 1,287 | 1,287 |  |
Payment of dividends by majority owned consolidated subsidiaries | (600) |  | (600) |
Ending Balance, Shares at Apr. 30, 2011 |  | 47,003 |  |
Ending Balance at Apr. 30, 2011 | 578,857 | 404,703 | 148,494 | 25,660
Comprehensive income: |  |  |  |
Net income | 54,303 |  | 54,303 |
Other comprehensive income, net of tax: |  |  |  |
Foreign currency translation adjustments | (12,826) |  |  | (12,826)
Defined benefit pension plan | (5,644) |  |  | (5,644)
Unrealized gains on marketable securities | 1 |  |  | 1
Total comprehensive income | 35,834 |  |  |
Purchase of stock, shares |  | (190) |  |
Purchase of stock | (4,215) | (4,215) |  |
Issuance of stock (in shares) |  | 1,100 |  |
Issuance of stock | 4,371 | 4,371 |  |
Stock-based compensation | 13,475 | 13,475 |  |
Tax benefit (expense) from exercise of stock options | 1,664 | 1,664 |  |
Ending Balance, Shares at Apr. 30, 2012 |  | 47,913 |  |
Ending Balance at Apr. 30, 2012 | $ 629,986 | $ 419,998 | $ 202,797 | $ 7,191

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