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Net Income Per Share (Tables)
 9 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Schedule Of Net Income Per Share
 
 
Three Months Ended
March 31,
 
Nine Months Ended
March 31,
 
 
2013
 
2012
 
2013
 
2012
Basic earnings per share
 
 
 
 
 
 
 
 
Net income
 
$
25,811

 
$
34,774

 
$
106,348

 
$
117,203

Basic earnings per share
 
$
0.44

 
$
0.60

 
$
1.82

 
$
2.03

Diluted earnings per share
 
 
 
 
 
 
 
 
Net income
 
$
25,811

 
$
34,774

 
$
106,348

 
$
117,203

Diluted earnings per share
 
$
0.44

 
$
0.59

 
$
1.80

 
$
2.00

Weighted-average number of shares outstanding
 
 
 
 
 
 
 
 
Basic
 
58,596

 
58,038

 
58,514

 
57,765

Effect of dilutive securities
 
481

 
783

 
487

 
932

Diluted
 
59,077

 
58,821

 
59,001

 
58,697

Excluded as anti-dilutive*
 
1,213

 
448

 
1,108

 
239


* 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.