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Consolidated Statements of Stockholders' Equity (USD $) In Thousands | Common Stock [Member] | Convertible Preferred Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member] | Treasury Stock [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balances, Value at Apr. 30, 2008 | $ 4,359 |  | $ 695,959 | $ 2,486 | $ 2,384,449 | $ (2,099,435) | $ 987,818
Beginning Balances, Shares at Apr. 30, 2008 | 435,891 |  |  |  |  | (109,880) |
Net income |  |  |  |  | 485,673 |  | 485,673
Unrealized translation gain (loss) |  |  |  | (10,125) |  |  | (10,125)
Change in net unrealized gain (loss) on available-for-sale securities |  |  |  | (4,000) |  |  | (4,000)
Proceeds from common stock Issuance, net of expenses | 83 |  | 141,332 |  |  |  | 141,415
Proceeds from common stock Issuance, net of expenses, shares | 8,286 |  |  |  |  |  |
Stock-based compensation |  |  | 32,600 |  |  |  | 32,600
Shares issued for: |  |  |  |  |  |  |
Option exercises, shares |  |  |  |  |  | 4,481 |
Option exercises, value |  |  | (12,624) |  |  | 85,624 | 73,000
Nonvested shares/units, shares |  |  |  |  |  | 1,015 |
Nonvested shares/units, value |  |  | (20,392) |  |  | 19,402 | (990)
ESPP, shares |  |  |  |  |  | 292 |
ESPP, value |  |  | (423) |  |  | 5,577 | 5,154
Acquisitions, shares |  |  |  |  |  | 8 |
Acquisitions, value |  |  | 25 |  |  | 163 | 188
Acquisition of treasury shares, shares |  |  |  |  |  | (5,991) |
Acquisition of treasury shares, value |  |  |  |  |  | (106,189) | (106,189)
Cash dividends declared and paid |  |  |  |  | (198,685) |  | (198,685)
Ending Balances, Value at Apr. 30, 2009 | 4,442 |  | 836,477 | (11,639) | 2,671,437 | (2,094,858) | 1,405,859
Ending Balances, Shares at Apr. 30, 2009 | 444,177 |  |  |  |  | (110,075) |
Net income |  |  |  |  | 479,242 |  | 479,242
Unrealized translation gain (loss) |  |  |  | 14,442 |  |  | 14,442
Change in net unrealized gain (loss) on available-for-sale securities |  |  |  | (1,125) |  |  | (1,125)
Stock-based compensation |  |  | 29,369 |  |  |  | 29,369
Shares issued for: |  |  |  |  |  |  |
Option exercises, shares |  |  |  |  |  | 1,293 |
Option exercises, value |  |  | (10,840) |  |  | 24,616 | 13,776
Nonvested shares/units, shares |  |  |  |  |  | 677 |
Nonvested shares/units, value |  |  | (13,806) |  | (300) | 12,879 | (1,227)
ESPP, shares |  |  |  |  |  | 266 |
ESPP, value |  |  | (924) |  |  | 5,058 | 4,134
Acquisition of treasury shares, shares |  |  |  |  |  | (246) |
Acquisition of treasury shares, value |  |  |  |  |  | (4,247) | (4,247)
Retirement of common shares, value | (128) |  | (7,672) |  | (242,203) |  | (250,003)
Retirement of common shares, shares | (12,786) |  |  |  |  |  | (12,800)
Cash dividends declared |  |  |  |  | (48,691) |  | (48,691)
Cash dividends declared and paid |  |  |  |  | (200,899) |  | (200,899)
Ending Balances, Value at Apr. 30, 2010 | 4,314 |  | 832,604 | 1,678 | 2,658,586 | (2,056,552) | 1,440,630
Ending Balances, Shares at Apr. 30, 2010 | 431,391 |  |  |  |  | (108,085) |
Net income |  |  |  |  | 406,110 |  | 406,110
Unrealized translation gain (loss) |  |  |  | 9,427 |  |  | 9,427
Change in net unrealized gain (loss) on available-for-sale securities |  |  |  | 128 |  |  | 128
Stock-based compensation |  |  | 14,500 |  |  |  | 14,500
Shares issued for: |  |  |  |  |  |  |
Option exercises, shares |  |  |  |  |  | 339 | 338
Option exercises, value |  |  | (8,332) |  |  | 6,439 | (1,893)
Nonvested shares/units, shares |  |  |  |  |  | 632 |
Nonvested shares/units, value |  |  | (12,952) |  | (95) | 12,028 | (1,019)
ESPP, shares |  |  |  |  |  | 269 |
ESPP, value |  |  | (1,784) |  |  | 5,121 | 3,337
Acquisition of treasury shares, shares |  |  |  |  |  | (230) |
Acquisition of treasury shares, value |  |  |  |  |  | (3,588) | (3,588)
Retirement of common shares, value | (190) |  | (11,370) |  | (268,387) |  | (279,947)
Retirement of common shares, shares | (18,950) |  |  |  |  |  | (19,000)
Cash dividends declared |  |  |  |  | (138,111) |  | (138,111)
Ending Balances, Value at Apr. 30, 2011 | $ 4,124 |  | $ 812,666 | $ 11,233 | $ 2,658,103 | $ (2,036,552) | $ 1,449,574
Ending Balances, Shares at Apr. 30, 2011 | 412,441 |  |  |  |  | (107,075) |

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