Basic earnings per share are computed by dividing net income by the weighted average number of Common Shares outstanding during the period. Diluted earnings per share are computed by dividing net income by the shares used in the calculation of basic net income per share plus the dilutive effect of common share equivalents, such as stock options, using the treasury stock method. Common share equivalents are excluded from the computation of diluted net income per share if their effect is anti-dilutive.


	Year ended June 30,
	2011		2010		2009
Basic earnings per share
Net income	$	123,203	$	89,212	$	56,938

Basic earnings per share	$	2.16	$	1.59	$	1.09

Diluted earnings per share
Net income	$	123,203	$	89,212	$	56,938

Diluted earnings per share	$	2.11	$	1.55	$	1.07

Weighted average number of shares outstanding
Basic		57,077		56,280		52,030
Effect of dilutive securities		1,183		1,105		1,241

Diluted		58,260		57,385		53,271

Excluded as anti-dilutive*		48		577		87

*	Represents options to purchase Common Shares excluded from the calculation of diluted net income per share because the exercise price of the stock options was greater than or equal to the average price of the Common Shares during the period.