11.Net Earnings per Share

Basic net earnings per share is computed by dividing net earnings available for basic common shares by the weighted average common shares outstanding during the period. Diluted net earnings per share is computed by dividing net earnings available for diluted common shares by the sum of weighted average common shares outstanding and dilutive potential common shares.

Basic and Dilutive Net Earnings Per Share Reconciliations


	Three Months Ended				Six Months Ended
	August 31				August 31
(In thousands except per share data)	2013		2012		2013		2012
Net earnings	$	140,274	$	111,636	$	286,925	$	232,382
Weighted average common shares outstanding		223,610		228,366		224,114		228,069
Dilutive potential common shares:
Stock options		3,319		2,958		3,257		3,196
Stock-settled restricted stock units		705		372		722		484
Weighted average common shares and dilutive
potential common shares		227,634		231,696		228,093		231,749
Basic net earnings per share	$	0.63	$	0.49	$	1.28	$	1.02
Diluted net earnings per share	$	0.62	$	0.48	$	1.26	$	1.00

Certain weighted-average options to purchase shares of common stock were outstanding and not included in the calculation of diluted net earnings per share because their inclusion would have been antidilutive. For the three months ended August 31, 2013 and 2012, weighted-average options to purchase 1,426,163 shares and 4,266,794 shares of common stock, respectively, were not included. For the six months ended August 31, 2013 and 2012, weighted-average options to purchase 1,073,635 shares and 3,678,076 shares, respectively, were not included.