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Net Earnings (Loss) Per Common Unitholders' Interest (Tables)
 12 Months Ended
Jul. 31, 2017
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
Additionally, in periods with net losses, there are no dilutive securities.
 
 
For the year ended July 31,
 
 
2017
 
2016
 
2015
Common unitholders’ interest in net earnings (loss)
 
$
(53,665
)
 
$
(658,761
)
 
$
29,324

 
 
 
 
 
 
 
Weighted average common units outstanding (in thousands)
 
97,229.5

 
98,682.8

 
84,646.2

 
 
 
 
 
 
 
Dilutive securities
 
—

 
—

 
6.7

 
 
 
 
 
 
 
Weighted average common units outstanding plus dilutive securities
 
97,229.5

 
98,682.8

 
84,652.9

 
 
 
 
 
 
 
Basic and diluted net earnings (loss) per common unitholders’ interest
 
$
(0.55
)
 
$
(6.68
)
 
$
0.35