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Employee Benefit Plans (Tables)
12 Months Ended
Jul. 31, 2012
Employee Benefit Plans [Abstract]  
Changes in plans accumulated benefit obligations
                 
    2012     2011  

Obligation at beginning of year

  $ 15,011     $ 15,277  

Service cost

    644       666  

Interest cost

    633       694  

Actuarial (gain)/loss

    1,104       (955

Benefit payments

    (2,062     (671

Plan amendments

    (1,105     —    
   

 

 

   

 

 

 

Obligation at end of fiscal year

  $ 14,225     $ 15,011  
   

 

 

   

 

 

 
Amounts recognized as liabilities in accompanying consolidated balance sheets
                 
    2012     2011  

Current liability

  $ 716     $ 1,054  

Noncurrent liability

    13,509       13,957  
   

 

 

   

 

 

 
    $ 14,225     $ 15,011  
   

 

 

   

 

 

 
Amounts recognized as other comprehensive income loss in accompanying consolidated balance sheet
                 
    2012     2011  

Net actuarial gain

  $ 1,837     $ 3,131  

Prior service credit

    1,405       503  
   

 

 

   

 

 

 
    $ 3,242     $ 3,634  
   

 

 

   

 

 

 
Net periodic benefit costs table
                         
    Years Ended July 31,  
    2012     2011     2010  

Net periodic postretirement benefit cost included the following components:

                       

Service cost — benefits attributed to service during the period

  $ 644     $ 666     $ 662  

Prior service credit

    (203     (82     (64

Interest cost on accumulated postretirement benefit obligation

    633       694       795  

Amortization of unrecognized gain

    (189     (76     (206
   

 

 

   

 

 

   

 

 

 

Periodic postretirement benefit cost

  $ 885     $ 1,202     $ 1,187  
   

 

 

   

 

 

   

 

 

 
Assumptions Used In Accounting For Plan
                         
    2012     2011     2010  

Weighted average discount rate used in determining accumulated postretirement benefit obligation liability

    3.25     4.50     4.50

Weighted average discount rate used in determining net periodic benefit cost

    4.50     4.50     5.50

Assumed health care trend rate used to measure APBO at July 31

    8.00     8.00     8.00

Rate to which cost trend rate is assumed to decline (the ultimate trend rate)

    5.50     5.50     5.50

Fiscal year the ultimate trend rate is reached

    2016       2017       2016  
Effect of one percentage point change in assumed health care cost trend rates
                 
    One-Percentage
Point Increase
    One-Percentage
Point Decrease
 

Effect on future service and interest cost

  $ 10     $ (10

Effect on accumulated postretirement benefit obligation at July 31, 2012

    296       (386
Expected Benefit Payments
         

2013

  $ 716  

2014

    760  

2015

    817  

2016

    878  

2017

    985  

2018 through 2021

    6,593