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Retirement Plans (Tables)
 3 Months Ended
Oct. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost (Income)
Components of net periodic benefit cost (income) were as follows: 
 
Pension Benefits
 
Other Benefits
 
Three Months Ended 
 October 31,
 
Three Months Ended 
 October 31,
 
2014
 
2013
 
2014
 
2013
Service cost
$
—

 
$
—

 
$
11

 
$
9

Interest cost
256

 
245

 
17

 
17

Expected return on plan assets
(292
)
 
(270
)
 
—

 
—

Amortization of net loss / (gain)
126

 
85

 
(132
)
 
(176
)
Net periodic benefit cost / (income)
$
90

 
$
60

 
$
(104
)
 
$
(150
)