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Pension and Postretirement Benefit Plans (Tables)
 6 Months Ended
Feb. 29, 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
 
Six months ended
 
February 29,
2016
 
February 28,
2015
 
February 29,
2016
 
February 28,
2015
 
(In thousands)
Defined benefit pension plans:
 
 
 
 
 
 
 
Service cost
$
1,275

 
$
1,169

 
$
2,569

 
$
2,423

Interest cost
1,041

 
1,095

 
2,104

 
2,263

Expected return on plan assets
(485
)
 
(448
)
 
(989
)
 
(919
)
Amortization of actuarial loss (gain) and prior service cost (credit), net
712

 
735

 
1,436

 
1,521

Net periodic pension benefit cost
$
2,543

 
$
2,551

 
$
5,120

 
$
5,288

 
 
 
 
 
 
 
 
Other postretirement benefit plan:
 
 
 
 
 
 
 
Service cost
$
1

 
$
1

 
$
2

 
$
2

Interest cost
97

 
110

 
194

 
220

Amortization of actuarial loss (gain) and prior service cost (credit), net
(149
)
 
(136
)
 
(298
)
 
(271
)
Net periodic postretirement benefit cost (credit)
$
(51
)
 
$
(25
)
 
$
(102
)
 
$
(49
)