Dividends and Stock Split	3 Months Ended
Apr. 30, 2012
Dividends [Abstract]
Dividends and Stock Split	DIVIDENDS AND STOCK SPLIT Dividends paid during the three months ended April 30, 2012 was $3,806 or 21 cents per share. Dividends paid during the three months ended April 30, 2011 was $3,254 or 18 cents per share. The company announced on May 23, 2012, that the board of directors approved a quarterly cash dividend of 21 cents per share, payable July 25, 2012 to shareholders of record on July 10, 2012. On May 23, 2012, the Board of Directors declared a two-for-one split of the company's common stock to be effected in the form of a stock dividend. The record date for the stock dividend is July 10, 2012, with the shares distributed on July 25, 2012. Per share calculations and average shares outstanding for all reported periods will be retrospectively adjusted during the second quarter of fiscal 2013. Pro forma basic and diluted earnings per share on a post stock split basis for the three months ended April 30, 2012 would both have been $0.52 per share. Pro forma basic and diluted earnings per share on a post stock split basis for the three months ended April 30, 2011 would both have been $0.43 per share.

DIVIDENDS AND STOCK SPLIT

Dividends paid during the three months ended April 30, 2012 was $3,806 or 21 cents per share. Dividends paid during the three months ended April 30, 2011 was $3,254 or 18 cents per share.

The company announced on May 23, 2012, that the board of directors approved a quarterly cash dividend of 21 cents per share, payable July 25, 2012 to shareholders of record on July 10, 2012.

On May 23, 2012, the Board of Directors declared a two-for-one split of the company's common stock to be effected in the form of a stock dividend. The record date for the stock dividend is July 10, 2012, with the shares distributed on July 25, 2012. Per share calculations and average shares outstanding for all reported periods will be retrospectively adjusted during the second quarter of fiscal 2013.

Pro forma basic and diluted earnings per share on a post stock split basis for the three months ended April 30, 2012 would both have been $0.52 per share. Pro forma basic and diluted earnings per share on a post stock split basis for the three months ended April 30, 2011 would both have been $0.43 per share.