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Net Earnings (Loss) Per Common Unitholders' Interest (Tables)
 12 Months Ended
Jul. 31, 2014
Earnings Per Share [Abstract]  
Earnings Distribution Allocation
In periods with undistributed earnings above certain levels, the calculation according to the two-class method results in an increased allocation of undistributed earnings to the general partner and a dilution of the earnings to the limited partners as follows.



Ratio of total distributions payable to:
Quarterly distribution per common unit

Common unitholder

General partner
$0.56 to $0.63

86.9
%

13.1
%
$0.64 to $0.82

76.8
%

23.2
%
$0.83 and above

51.5
%

48.5
%
Basic And Diluted Net Earnings Per Common Unitholders' Interest
 
 
For the year ended July 31,
 
 
2014
 
2013
 
2012
Common unitholders’ interest in net earnings (loss)
 
$
32,879

 
$
55,862

 
$
(10,842
)
 
 
 
 
 
 
 
Weighted average common units outstanding (in thousands)
 
79,651.1

 
79,038.6

 
77,572.4

 
 
 
 
 
 
 
Dilutive securities
 
20.6

 
37.0

 
—

 
 
 
 
 
 
 
Weighted average common units outstanding plus dilutive securities
 
79,671.7

 
79,075.6

 
77,572.4

 
 
 
 
 
 
 
Basic and diluted net earnings (loss) per common unitholders’ interest
 
$
0.41

 
$
0.71

 
$
(0.14
)