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Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, unless otherwise specified | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Beginning Balances, Value at Apr. 30, 2011 | $ 1,449,574 | $ 4,124 | $ 812,666 | $ 11,233 | $ 2,658,103 | $ (2,036,552)
Beginning Balances, Shares |  | (397,887) |  |  |  | (105,768)
Net income | 265,932 |  |  |  | 265,932 |
Other comprehensive income (loss) | 912 |  |  | 912 |  |
Unrealized translation gain | (2,186) |  |  |  |  |
Change in net unrealized gain on available-for-sale securities | 3,098 |  |  |  |  |
Stock-based compensation | 14,968 |  | 14,968 |  |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | 6,383 |  | (22,118) |  | (125) | 28,626
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  |  |  |  | 1,505
Shares issued for: |  |  |  |  |  |
Acquisition of treasury shares, shares |  |  |  |  |  | (198)
Acquisition of treasury shares, value | (3,087) |  |  |  |  | (3,087)
Repurchase and retirement of common shares, shares | (14,554) | (14,554) |  |  |  |
Repurchase and retirement of common shares, value | (199,989) | (145) | (8,732) |  | (191,112) |
Cash dividends declared and paid | (208,801) |  |  |  | (208,801) |
Ending Balances, Value at Apr. 30, 2012 | 1,325,892 | 3,979 | 796,784 | 12,145 | 2,523,997 | (2,011,013)
Ending Balances, Shares at Apr. 30, 2012 |  | (397,887) |  |  |  | (105,768)
Beginning Balances, Shares |  | (316,628) |  |  |  | (43,993)
Net income | 433,948 |  |  |  | 433,948 |
Other comprehensive income (loss) | (1,595) |  |  | (1,595) |  |
Unrealized translation gain | (1,760) |  |  |  |  |
Change in net unrealized gain on available-for-sale securities | 165 |  |  |  |  |
Stock-based compensation | 15,293 |  | 15,293 |  |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | 25,138 |  | (11,652) |  | (257) | 37,047
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  |  |  |  | 1,949
Shares issued for: |  |  |  |  |  |
Acquisition of treasury shares, shares |  |  |  |  |  | (174)
Acquisition of treasury shares, value | (2,928) |  |  |  |  | (2,928)
Repurchase and retirement of common shares, shares | (21,259) | (21,259) |  |  |  |
Repurchase and retirement of common shares, value | (315,000) | (213) | (12,542) |  | (302,245) |
Treasury Stock, Shares, Retired |  | 60,000 |  |  |  | 60,000
Treasury Stock, Retired, Cost Method, Amount | 0 | 600 | 35,400 |  | 1,104,797 | 1,140,797
Cash dividends declared | (217,201) |  |  |  | (217,201) |
Ending Balances, Value at Apr. 30, 2013 | 1,263,547 | 3,166 | 752,483 | 10,550 | 1,333,445 | (836,097)
Ending Balances, Shares at Apr. 30, 2013 |  | (316,628) |  |  |  | (43,993)
Beginning Balances, Shares |  | (316,628) |  |  |  | (42,400)
Net income | 475,157 |  |  |  | 475,157 |
Other comprehensive income (loss) | (5,373) |  |  | (5,373) |  |
Unrealized translation gain | (3,475) |  |  |  |  |
Change in net unrealized gain on available-for-sale securities | (1,898) |  |  |  |  |
Stock-based compensation | 20,058 |  | 20,058 |  |  |
Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures | 28,246 |  | (5,887) |  | (325) | 34,458
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  |  |  |  |  | 1,811
Shares issued for: |  |  |  |  |  |
Option exercises, shares | 1,179 |  |  |  |  |
Acquisition of treasury shares, shares |  |  |  |  |  | (218)
Acquisition of treasury shares, value | (6,106) |  |  |  |  | (6,106)
Repurchase and retirement of common shares, shares | 0 |  |  |  |  |
Repurchase and retirement of common shares, value | 0 |  |  |  |  |
Treasury Stock, Shares, Retired | 60,000 |  |  |  |  |
Cash dividends declared | (218,980) |  |  |  | (218,980) |
Ending Balances, Value at Apr. 30, 2014 | 1,556,549 | 3,166 | 766,654 | 5,177 | 1,589,297 | (807,745)
Ending Balances, Shares at Apr. 30, 2014 |  | (316,628) |  |  |  | (42,400)
Beginning Balances, Value at Jan. 31, 2014 |  |  |  |  |  |
Beginning Balances, Shares |  | (316,628) |  |  |  |
Net income | 909,998 |  |  |  |  |
Ending Balances, Value at Apr. 30, 2014 | $ 1,556,549 | $ 3,166 |  |  |  |
Ending Balances, Shares at Apr. 30, 2014 |  | (316,628) |  |  |  |

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