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Consolidated Statements Of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member] | Director [Member] | Director [Member] Common Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance, beginning of year at Nov. 30, 2010 | $ 690,273 | $ 665 | $ 346,938 | $ 350,409 | $ (7,739) |  |
Balance, beginning of year, shares at Nov. 30, 2010 |  | 66,528,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of stock under employee stock purchase plan, shares |  | 594,000 |  |  |  |  |
Issuance of stock under the employee stock purchase plan, value | 6,844 | 6 | 6,838 |  |  |  |
Exercise of stock options, shares |  | 2,755,000 |  |  |  |  |
Exercise of stock options, value | 42,828 | 28 | 42,800 |  |  |  |
Issuance of shares to Board of Directors, shares |  |  |  |  |  |  | 31,000
Issuance of shares to Board of Directors, value |  |  |  |  |  | 0 | 0
Vesting of restricted stock units, shares |  | 386,000 |  |  |  |  |
Vesting of restricted stock units, value | 4 | 4 |  |  |  |  |
Withholding tax payments related to net issuance of restricted stock units, shares |  | (114,000) |  |  |  |  |
Withholding tax payments related to net issuance of restricted stock units, value | (2,706) | (1) | (2,705) |  |  |  |
Tax benefit arising from employee stock purchase plan, stock options and restricted share activity | 6,162 | 0 | 6,162 |  |  |  |
Stock-based compensation | 25,999 |  | 25,999 |  |  |  |
Treasury stock repurchases and retirements, shares | (8,391,000) | (8,391,000) |  |  |  |  |
Treasury stock repurchases and retirements, value | (200,009) | (84) | (117,429) | (82,496) |  |  |
Unrealized gain (loss) on investments, net of tax | 354 |  |  |  |  |  |
Net income | 59,629 |  |  | 59,629 |  |  |
Other comprehensive income (losses) | (3,914) |  |  |  | (3,914) |  |
Balance, end of year at Nov. 30, 2011 | 625,110 | 618 | 308,603 | 327,542 | (11,653) |  |
Balance, end of year, shares at Nov. 30, 2011 |  | 61,789,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of stock under employee stock purchase plan, shares |  | 376,000 |  |  |  |  |
Issuance of stock under the employee stock purchase plan, value | 5,654 | 4 | 5,650 |  |  |  |
Exercise of stock options, shares |  | 1,488,000 |  |  |  |  |
Exercise of stock options, value | 23,435 | 15 | 23,420 |  |  |  |
Issuance of shares to Board of Directors, shares |  |  |  |  |  |  | 0
Issuance of shares to Board of Directors, value |  |  |  |  |  | 0 | 0
Vesting of restricted stock units, shares |  | 625,000 |  |  |  |  |
Vesting of restricted stock units, value | 6 | 6 |  |  |  |  |
Withholding tax payments related to net issuance of restricted stock units, shares |  | (189,000) |  |  |  |  |
Withholding tax payments related to net issuance of restricted stock units, value | (4,155) | (2) | (4,153) |  |  |  |
Tax benefit arising from employee stock purchase plan, stock options and restricted share activity | 167 | 0 | 167 |  |  |  |
Stock-based compensation | 28,233 |  | 28,233 |  |  |  |
Treasury stock repurchases and retirements, shares | (4,494,000) | (4,494,000) |  |  |  |  |
Treasury stock repurchases and retirements, value | (88,384) | (45) | (62,183) | (26,156) |  |  |
Unrealized gain (loss) on investments, net of tax | 1,527 |  |  |  |  |  |
Net income | 47,444 |  |  | 47,444 |  |  |
Other comprehensive income (losses) | 889 |  |  |  | 889 |  |
Balance, end of year at Nov. 30, 2012 | 638,399 | 596 | 299,737 | 348,830 | (10,764) |  |
Balance, end of year, shares at Nov. 30, 2012 | 59,594,961 | 59,595,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of stock under employee stock purchase plan, shares |  | 281,000 |  |  |  |  |
Issuance of stock under the employee stock purchase plan, value | 4,298 | 3 | 4,295 |  |  |  |
Exercise of stock options, shares | 2,722,000 | 2,722,000 |  |  |  |  |
Exercise of stock options, value | 50,466 | 27 | 50,439 |  |  |  |
Vesting of restricted stock units, shares |  | 697,000 |  |  |  |  |
Vesting of restricted stock units, value | 7 | 7 |  |  |  |  |
Withholding tax payments related to net issuance of restricted stock units, shares |  | (203,000) |  |  |  |  |
Withholding tax payments related to net issuance of restricted stock units, value | (4,938) | (2) | (4,936) |  |  |  |
Tax benefit arising from employee stock purchase plan, stock options and restricted share activity | (520) | 0 | (520) |  |  |  |
Stock-based compensation | 21,399 |  | 21,399 |  |  |  |
Treasury stock repurchases and retirements, shares | (11,579,000) | (11,579,000) |  |  |  |  |
Treasury stock repurchases and retirements, value | (269,469) | (116) | (165,622) | (103,731) |  |  |
Unrealized gain (loss) on investments, net of tax | 171 |  |  |  |  |  |
Net income | 74,907 |  |  | 74,907 |  |  |
Other comprehensive income (losses) | (895) |  |  |  | (895) |  |
Balance, end of year at Nov. 30, 2013 | $ 513,654 | $ 515 | $ 204,792 | $ 320,006 | $ (11,659) |  |
Balance, end of year, shares at Nov. 30, 2013 | 51,512,595 | 51,513,000 |  |  |  |  |

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