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Equities (Tables)
 12 Months Ended
Aug. 31, 2018
Equity [Abstract]  
Schedule of Outstanding Preferred Stock
The following is a summary of our outstanding preferred stock as of August 31, 2018, all shares of which are listed on the Global Select Market of Nasdaq:
 
 
Nasdaq symbol
 
Issuance date
 
Shares outstanding
 
Redemption value
 
Net proceeds (a)
 
Dividend rate
 (b) (c)
 
Dividend payment frequency
 
Redeemable beginning (d)
 
 
 
 
 
 
 
 
(Dollars in millions)
 
 
 
 
 
 
8% Cumulative Redeemable
 
CHSCP
 
(e)
 
12,272,003

 
$
306.8

 
$
311.2

 
8.00
%
 
Quarterly
 
7/18/2023
Class B Cumulative Redeemable, Series 1
 
CHSCO
 
(f)
 
21,459,066

 
$
536.5

 
$
569.3

 
7.875
%
 
Quarterly
 
9/26/2023
Class B Reset Rate Cumulative Redeemable, Series 2
 
CHSCN
 
3/11/2014
 
16,800,000

 
$
420.0

 
$
406.2

 
7.10
%
 
Quarterly
 
3/31/2024
Class B Reset Rate Cumulative Redeemable, Series 3
 
CHSCM
 
9/15/2014
 
19,700,000

 
$
492.5

 
$
476.7

 
6.75
%
 
Quarterly
 
9/30/2024
Class B Cumulative Redeemable, Series 4
 
CHSCL
 
1/21/2015
 
20,700,000

 
$
517.5

 
$
501.0

 
7.50
%
 
Quarterly
 
1/21/2025

(a) 
Includes patrons' equities redeemed with preferred stock.
(b) 
The Class B Reset Rate Cumulative Redeemable Preferred Stock, Series 2 accumulates dividends at a rate of 7.10% per year until March 31, 2024, and then at a rate equal to the three-month LIBOR plus 4.298%, not to exceed 8.00% per annum, subsequent to March 31, 2024.
(c) 
The Class B Reset Rate Cumulative Redeemable Preferred Stock, Series 3 accumulates dividends at a rate of 6.75% per year until September 30, 2024, and then at a rate equal to the three-month LIBOR plus 4.155%, not to exceed 8.00% per annum, subsequent to September 30, 2024.
(d) 
Preferred stock is redeemable for cash at our option, in whole or in part, at a per share price equal to the per share liquidation preference of $25.00 per share, plus all dividends accumulated and unpaid on that share to and including the date of redemption, beginning on the dates set forth in this column.
(e) 
The 8% Cumulative Redeemable Preferred Stock was issued at various times from 2003 through 2010.
(f) 
Shares of Class B Cumulative Redeemable Preferred Stock, Series 1 were issued on September 26, 2013, August 25, 2014, March 31, 2016 and March 30, 2017.
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component
Changes in accumulated other comprehensive income (loss) by component, for the years ended August 31, 2018, 2017, and 2016 are as follows:
 
Pension and Other Postretirement Benefits
 
Unrealized Net Gain (Loss) on Available for Sale Investments
 
Cash Flow Hedges
 
Foreign Currency Translation Adjustment
 
Total
 
(Dollars in thousands)
Balance as of August 31, 2015, net of tax (As previously reported)
$
(171,729
)
 
$
4,156

 
$
(5,324
)
 
$
(41,310
)
 
$
(214,207
)
Cumulative restatement adjustments
—

 
—

 
—

 
1,370

 
1,370

Balance as of August 31, 2015, net of tax (As restated)
(171,729
)
 
4,156

 
(5,324
)
 
(39,940
)
 
(212,837
)
Other comprehensive income (loss), before tax:
 
 
 
 
 
 
 
 
 
Amounts before reclassifications
(10,512
)
 
2,447

 
(11,353
)
 
(2,210
)
 
(21,628
)
Amounts reclassified out
20,998

 
—

 
5,071

 
469

 
26,538

Total other comprehensive income (loss), before tax
10,486

 
2,447

 
(6,282
)
 
(1,741
)
 
4,910

Tax effect
(3,903
)
 
(947
)
 
2,410

 
(1,163
)
 
(3,603
)
Other comprehensive income (loss), net of tax
6,583

 
1,500

 
(3,872
)
 
(2,904
)
 
1,307

Balance as of August 31, 2016, net of tax (As restated)
(165,146
)
 
5,656

 
(9,196
)
 
(42,844
)
 
(211,530
)
Other comprehensive income (loss), before tax:
 
 
 
 
 
 
 
 
 
Amounts before reclassifications
25,216

 
7,117

 
1,892

 
(7,960
)
 
26,265

Amounts reclassified out
26,174

 
—

 
1,742

 
15

 
27,931

Total other comprehensive income (loss), before tax
51,390

 
7,117

 
3,634

 
(7,945
)
 
54,196

Tax effect
(18,688
)
 
(2,732
)
 
(1,392
)
 
(214
)
 
(23,026
)
Other comprehensive income (loss), net of tax
32,702

 
4,385

 
2,242

 
(8,159
)
 
31,170

Balance as of August 31, 2017, net of tax (As restated)
(132,444
)
 
10,041

 
(6,954
)
 
(51,003
)
 
(180,360
)
Other comprehensive income (loss), before tax:
 
 
 
 
 
 
 
 
 
Amounts before reclassifications
7,633

 
21,078

 
1,031

 
(10,062
)
 
19,680

Amounts reclassified out
21,804

 
(25,534
)
 
1,704

 
(2,042
)
 
(4,068
)
Total other comprehensive income (loss), before tax
29,437

 
(4,456
)
 
2,735

 
(12,104
)
 
15,612

Tax effect
(9,371
)
 
1,308

 
(195
)
 
83

 
(8,175
)
Other comprehensive income (loss), net of tax
20,066

 
(3,148
)
 
2,540

 
(12,021
)
 
7,437

Reclassification of tax effects to retained earnings
(27,957
)
 
1,968

 
(1,468
)
 
465

 
(26,992
)
Balance as of August 31, 2018, net of tax
$
(140,335
)
 
$
8,861

 
$
(5,882
)
 
$
(62,559
)
 
$
(199,915
)