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Pension and Postretirement Benefit Plans (Tables)
 9 Months Ended
May 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The components of the Company’s net periodic benefit cost for defined benefit pension and other postretirement benefit plans are shown below:
 
Three months ended May 31,
 
Nine months ended May 31,
 
2016
 
2015
 
2016
 
2015
 
(In thousands)
Defined benefit pension plans:
 
 
 
 
 
 
 
Service cost
$
1,306

 
$
1,093

 
$
3,875

 
$
3,516

Interest cost
1,056

 
1,036

 
3,160

 
3,299

Expected return on plan assets
(484
)
 
(435
)
 
(1,473
)
 
(1,354
)
Amortization of actuarial loss (gain)
726

 
692

 
2,162

 
2,213

Net periodic pension benefit cost
$
2,604

 
$
2,386

 
$
7,724

 
$
7,674

 
 
 
 
 
 
 
 
Other postretirement benefit plan:
 
 
 
 
 
 
 
Service cost
$
1

 
$
1

 
$
3

 
$
3

Interest cost
97

 
110

 
291

 
330

Prior service cost (credit)
(149
)
 
(135
)
 
(447
)
 
(406
)
Net periodic postretirement benefit cost (credit)
$
(51
)
 
$
(24
)
 
$
(153
)
 
$
(73
)