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Net Income Per Share (Tables)
 6 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Schedule Of Net Income Per Share
 
 
Three Months Ended
December 31,
 
Six Months Ended December 31,
 
 
2012
 
2011
 
2012
 
2011
Basic earnings per share
 
 
 
 
 
 
 
 
Net income
 
$
61,108

 
$
47,443

 
$
80,537

 
$
82,429

Basic earnings per share
 
$
1.04

 
$
0.82

 
$
1.38

 
$
1.43

Diluted earnings per share
 
 
 
 
 
 
 
 
Net income
 
$
61,108

 
$
47,443

 
$
80,537

 
$
82,429

Diluted earnings per share
 
$
1.04

 
$
0.81

 
$
1.37

 
$
1.41

Weighted-average number of shares outstanding
 
 
 
 
 
 
 
 
Basic
 
58,503

 
57,846

 
58,473

 
57,642

Effect of dilutive securities
 
480

 
826

 
488

 
1,005

Diluted
 
58,983

 
58,672

 
58,961

 
58,647

Excluded as anti-dilutive*
 
1,076

 
189

 
1,065

 
137


* 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.