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Stockholders' Equity (Schedule Of Dividend Declared) (Details) (USD $)
3 Months Ended
Aug. 31, 2011
May 31, 2011
Feb. 28, 2011
Nov. 30, 2010
Aug. 31, 2010
May 31, 2010
Feb. 28, 2010
Nov. 30, 2009
Stockholders' Equity        
Dividend Declaration DateJul. 21, 2011Apr. 13, 2011Jan. 19, 2011Oct. 21, 2010Jul. 22, 2010Apr. 14, 2010Jan. 22, 2010Oct. 22, 2009
Dividend per Share$ 0.07$ 0.07$ 0.07$ 0.07$ 0.07$ 0.07$ 0.07$ 0.07
Total Cash Dividends Declared$ 15,233,000$ 15,647,000$ 15,634,000$ 15,563,000$ 15,247,000$ 15,221,000$ 15,238,000$ 15,186,000[1]
Date of Record for Dividend PaymentAug. 15, 2011May 16, 2011Feb. 15, 2011Nov. 15, 2010Aug. 16, 2010May 17, 2010Feb. 16, 2010Nov. 16, 2009
Dividend Cash Payment DateSep. 01, 2011Jun. 01, 2011Mar. 01, 2011Dec. 01, 2010Sep. 01, 2010Jun. 01, 2010Mar. 01, 2010Dec. 01, 2009
Dividend paid out of additional paid in capital       $ 14,400,000
[1] Of the $15.2 million in total dividends declared during the first quarter of fiscal year 2010, $14.4 million was paid out of additional paid-in capital (which represents the amount of dividends declared in excess of the Company's retained earnings balance as of the date that the dividend was declared).