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Employee Benefit Plans Employee Benefit Plans (Tables)
 9 Months Ended
Apr. 30, 2016
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The components of net periodic postretirement benefit cost for the three and nine months ended April 30, 2016 and 2015 were as follows:
 
Three months ended April 30,
 
Nine months ended April 30,
 
2016
 
2015
 
2016
 
2015
Components of net periodic postretirement benefit cost:
 
 
 
 
 
 
 
        Service cost
$
2

 
$
40

 
$
6

 
$
203

Interest cost
29

 
35

 
86

 
177

Amortization of prior service credit
—

 
(40
)
 
(1,035
)
 
(202
)
Amortization of net actuarial gain
(161
)
 
(106
)
 
(484
)
 
(540
)
Curtailment gain
—

 
(4,296
)
 
—

 
(4,296
)
Net periodic postretirement benefit cost
$
(130
)
 
$
(4,367
)
 
$
(1,427
)
 
$
(4,658
)