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Net Earnings (Loss) Per Common Unitholders' Interest (Tables)
 12 Months Ended
Jul. 31, 2013
Earnings Per Share [Abstract]  
Basic And Diluted Net Earnings Per Common Unitholders' Interest
 
 
For the year ended July 31,
 
 
2013
 
2012
 
2011
Common unitholders’ interest in net earnings (loss)
 
$
55,862

 
$
(10,842
)
 
$
(43,212
)
 
 
 
 
 
 
 
Weighted average common units outstanding (in thousands)
 
79,038.6

 
77,572.4

 
72,313.6

 
 
 
 
 
 
 
Dilutive securities
 
37.0

 
—

 
—

 
 
 
 
 
 
 
Weighted average common units outstanding plus dilutive securities
 
79,075.6

 
77,572.4

 
72,313.6

 
 
 
 
 
 
 
Basic and diluted net earnings per common unitholders’ interest
 
$
0.71

 
$
(0.14
)
 
$
(0.60
)