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Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Paid-In Capital [Member] | Retained Earnings [Member] | Other Accumulated Comprehensive Income (Loss) [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at May. 31, 2011 | $ 2,302,649 | $ 135,401 | $ 95,732 | $ 3,255,256 | $ 58,807 | $ (1,242,547)
Balance (shares) at May. 31, 2011 |  | 173,346,000 |  |  |  |
Balance, Treasury Stock (shares) at May. 31, 2011 |  |  |  |  |  | (35,762,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 297,637 |  |  | 297,637 |  |
Comprehensive income (loss), net of tax | (22,144) |  |  |  | (22,144) |
Dividends | (70,820) |  |  | (70,820) |  |
Stock-based compensation | 20,312 |  | 20,312 |  |  |
Vesting of stock-based compensation awards (shares) |  | 297,000 |  |  |  |
Vesting of stock-based compensation awards | 0 | 9,513 | (9,513) |  |  |
Stock options exercised, net of shares surrendered (shares) |  | 103,000 |  |  |  |
Stock options exercised, net of shares surrendered | 3,341 | 3,341 |  |  |  |
Repurchase of common stock (shares) |  |  |  |  |  | (11,464,000)
Repurchase of common stock | (392,328) |  |  |  |  | (392,328)
Other | 488 |  | 488 |  |  |
Balance at May. 31, 2012 | 2,139,135 | 148,255 | 107,019 | 3,482,073 | 36,663 | (1,634,875)
Balance (shares) at May. 31, 2012 |  | 173,746,000 |  |  |  |
Balance, Treasury Stock (shares) at May. 31, 2012 |  |  |  |  |  | (47,226,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 315,442 |  |  | 315,442 |  |
Comprehensive income (loss), net of tax | 1,460 |  |  |  | 1,460 |
Dividends | (79,744) |  |  | (79,744) |  |
Stock-based compensation | 23,310 |  | 23,310 |  |  |
Vesting of stock-based compensation awards (shares) |  | 610,000 |  |  |  |
Vesting of stock-based compensation awards | 0 | 23,270 | (23,270) |  |  |
Stock options exercised, net of shares surrendered (shares) |  | 430,000 |  |  |  |
Stock options exercised, net of shares surrendered | 14,807 | 14,807 |  |  |  |
Repurchase of common stock (shares) |  |  |  |  |  | (5,279,000)
Repurchase of common stock | (215,681) |  |  |  |  | (215,681)
Other | 2,763 |  | 2,763 |  |  |
Balance at May. 31, 2013 | 2,201,492 | 186,332 | 109,822 | 3,717,771 | 38,123 | (1,850,556)
Balance (shares) at May. 31, 2013 |  | 174,786,000 |  |  |  |
Balance, Treasury Stock (shares) at May. 31, 2013 | (52,504,503) |  |  |  |  | (52,505,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 374,442 |  |  | 374,442 |  |
Comprehensive income (loss), net of tax | (9,695) |  |  |  | (9,695) |
Dividends | (93,320) |  |  | (93,320) |  |
Stock-based compensation | 44,746 |  | 44,746 |  |  |
Vesting of stock-based compensation awards (shares) |  | 465,000 |  |  |  |
Vesting of stock-based compensation awards | 0 | 23,519 | (23,519) |  |  |
Stock options exercised, net of shares surrendered (shares) |  | 1,127,000 |  |  |  |
Stock options exercised, net of shares surrendered | 41,902 | 41,902 |  |  |  |
Repurchase of common stock (shares) |  |  |  |  |  | (6,836,000)
Repurchase of common stock | (370,599) |  |  |  |  | (370,599)
Other | 3,890 |  | 3,890 |  |  |
Balance at May. 31, 2014 | $ 2,192,858 | $ 251,753 | $ 134,939 | $ 3,998,893 | $ 28,428 | $ (2,221,155)
Balance (shares) at May. 31, 2014 |  | 176,378,000 |  |  |  |
Balance, Treasury Stock (shares) at May. 31, 2014 | (59,340,628) |  |  |  |  | (59,341,000)

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