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Benefit Plans Schedule of Net Benefit Costs (Tables)
 3 Months Ended
Nov. 30, 2017
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs of Assumptions Used
 
Qualified
Pension Benefits
 
Non-Qualified
Pension Benefits
 
Other Benefits
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
Components of net periodic benefit costs for the three months ended November 30 are as follows:
 (Dollars in thousands)
  Service cost
$
9,919

 
$
9,383

 
$
137

 
$
259

 
$
236

 
$
353

  Interest cost
6,002

 
7,692

 
178

 
352

 
227

 
427

  Expected return on assets
(12,040
)
 
(12,014
)
 
—

 
—

 
—

 
—

  Prior service cost (credit) amortization
359

 
402

 
8

 
57

 
(141
)
 
(30
)
  Actuarial (gain) loss amortization
6,888

 
4,765

 
15

 
173

 
(306
)
 
(116
)
Net periodic benefit cost
$
11,128

 
$
10,228

 
$
338

 
$
841

 
$
16

 
$
634