Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Apr. 30, 2013
PENSION AND OTHER POSTRETIREMENT BENEFITS [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic pension and postretirement health benefit costs were as follows:
 
PENSION PLAN
 
(in thousands)
 
For the Three Months Ended April 30,
 
For the Nine Months Ended April 30,
 
2013
 
2012
 
2013
 
2012
Service cost
$
437

 
$
331

 
$
1,313

 
$
993

Interest cost
386

 
405

 
1,158

 
1,213

Expected return on plan assets
(377
)
 
(370
)
 
(1,132
)
 
(1,110
)
Amortization of:
 
 
 
 
 
 
 
  Prior service costs
4

 
4

 
11

 
11

  Other actuarial loss
221

 
79

 
663

 
238

Net periodic benefit cost
$
671

 
$
449

 
$
2,013

 
$
1,345

 
 
 
 
 
 
 
 
 
POSTRETIREMENT HEALTH PLAN
 
(in thousands)
 
For the Three Months Ended April 30,
 
For the Nine Months Ended April 30,
 
2013
 
2012
 
2013
 
2012
Service cost
$
34

 
$
26

 
$
102

 
$
78

Interest cost
24

 
27

 
72

 
79

Amortization of:
 
 
 
 
 
 
 
  Net transition obligation
4

 
4

 
12

 
12

  Other actuarial loss
13

 
7

 
39

 
22

Net periodic benefit cost
$
75

 
$
64

 
$
225

 
$
191
Schedule of Assumptions Used
Assumptions used in the previous calculations were as follows:
 
PENSION PLAN
 
POSTRETIREMENT
HEALTH PLAN
 
For the Three and Nine Months Ended April 30,
 
2013
 
2012
 
2013
 
2012
Discount rate for net periodic benefit cost
3.75
%
 
5.25
%
 
3.75
%
 
5.25
%
Rate of increase in compensation levels
3.50
%
 
4.00
%
 
—

 
—

Long-term expected rate of return on assets
7.50
%
 
7.50
%
 
—

 
—