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Benefit Plans (Tables)
 12 Months Ended
Aug. 31, 2025
Retirement Benefits [Abstract]  
Schedule of defined benefit plans disclosures Financial information on changes in projected benefit obligation, plan assets funded and balance sheet status as of August 31, 2025 and 2024, is as follows:
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202520242025202420252024
 (Dollars in thousands)
Change in benefit obligation:      
Projected benefit obligation at beginning of period$760,763 $708,511 $26,443 $20,980 $24,787 $22,572 
Service cost43,727 37,391 3,027 1,968 844 650 
Interest cost34,898 35,928 1,154 1,043 1,140 1,144 
Actuarial loss (gain):
Experience study and mortality updates8,394 2,988 365 244 (29)— 
Other demographic experience*20,025 18,647 2,862 3,217 (646)1,465 
Discount rate change(30,273)21,372 (331)626 (845)681 
Plan amendments(6,236)223 (227)— — — 
Benefits paid(57,776)(64,297)(1,829)(1,635)(1,624)(1,725)
Projected benefit obligation at end of period$773,522 $760,763 $31,464 $26,443 $23,627 $24,787 
Change in plan assets:      
Fair value of plan assets at beginning of period$781,412 $736,150 $— $— $— $— 
Actual (loss) gain on plan assets22,650 67,559 — — — — 
Company contributions30,000 42,000 1,829 1,635 1,624 1,725 
Benefits paid(57,776)(64,297)(1,829)(1,635)(1,624)(1,725)
Fair value of plan assets at end of period$776,286 $781,412 $— $— $— $— 
Funded status at end of period$2,764 $20,649 $(31,464)$(26,443)$(23,627)$(24,787)
Amounts recognized on balance sheet:      
Noncurrent assets$11,969 $20,649 $— $— $— $— 
Accrued benefit cost:
Current liabilities— — (4,890)(3,950)(1,630)(2,080)
Noncurrent liabilities(9,205)— (26,574)(22,493)(21,997)(22,707)
Ending balance$2,764 $20,649 $(31,464)$(26,443)$(23,627)$(24,787)
Amounts recognized in accumulated other comprehensive loss (pretax):      
Prior service cost (credit)$(5,219)$1,216 $(227)$(47)$(490)$(935)
Net loss (gain)278,779 269,122 10,097 8,001 (14,662)(14,335)
Ending balance$273,560 $270,338 $9,870 $7,954 $(15,152)$(15,270)
Schedule of information for pensions plans with an accumulated benefit obligation in excess of plan assets Information for the pension plans with an accumulated benefit obligation in excess of plan assets is set forth below:
Years Ended August 31,
20252024
(Dollars in thousands)
Projected benefit obligation$31,464 $26,443 
Accumulated benefit obligation31,272 26,173 
Schedule of net benefit costs of assumptions used Components of net periodic benefit costs for the years ended August 31, 2025, 2024 and 2023, are as follows:
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
202520242023202520242023202520242023
(Dollars in thousands)
Components of net periodic benefit costs:
Service cost$43,727 $37,391 $38,579 $3,027 $1,968 $1,840 $844 $650 $670 
Interest cost34,898 35,928 30,588 1,154 1,043 741 1,140 1,144 1,035 
Expected return on assets(46,977)(47,860)(43,129)— — — — — — 
Prior service cost (credit) amortization199 178 149 (47)(114)(114)(445)(445)(445)
Actuarial loss (gain) amortization12,815 1,796 1,872 799 380 245 (1,192)(1,616)(1,615)
Net periodic benefit cost (benefit)$44,662 $27,433 $28,059 $4,933 $3,277 $2,712 $347 $(267)$(355)
Schedule of components of net periodic benefit costs and amounts recognized in other comprehensive income (loss) Components of net periodic benefit costs and amounts recognized in other comprehensive loss (income) for the years ended August 31, 2025, 2024 and 2023, are as follows:
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202520242023202520242023202520242023
 (Dollars in thousands)
Other comprehensive loss (income):         
Prior service cost$(6,236)$223 $490 $(227)$— $— $— $— $— 
Net actuarial loss (gain)22,472 23,309 14,082 2,896 4,087 1,282 (1,519)2,145 (1,865)
Amortization of actuarial (gain) loss(12,815)(1,796)(1,872)(799)(380)(245)1,192 1,616 1,615 
Amortization of prior service (credit) costs(199)(178)(149)47 114 114 445 445 445 
Total recognized in other comprehensive loss (income)$3,222 $21,558 $12,551 $1,917 $3,821 $1,151 $118 $4,206 $195 
Schedule of amounts in accumulated other comprehensive income (loss) to be recognized over next fiscal year stimated amortization in fiscal 2026 from accumulated other comprehensive loss into net periodic benefit cost is as follows:
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other
Benefits
 (Dollars in thousands)
Amortization of prior service costs (credit)$(595)$(30)$(445)
Amortization of actuarial loss (gain)16,498 982 (1,197)
Schedule of effect of one-percentage-point change in assumed health care cost trend rates A one-percentage-point change in the assumed health care cost trend rates would have the following effects:
1% Increase1% Decrease
 (Dollars in thousands)
Effect on total of service and interest cost components$200 $(170)
Effect on postretirement benefit obligation1,700 (1,700)
Schedule of expected benefit payments Our retiree benefit payments, which reflect expected future service, are anticipated to be paid as follows:
 Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 (Dollars in thousands)
2026$74,200 $4,890 $1,630 
202774,300 5,080 1,870 
202874,700 4,770 2,100 
202976,700 4,510 2,010 
203081,100 4,490 1,990 
2031-2035392,200 21,730 10,180 
Schedule of defined benefit plans, fair value disclosure Our pension plans' recurring fair value measurements by asset category as of August 31, 2025 and 2024, are presented in the tables below:
 2025
 Level 1Level 2Level 3Total
 (Dollars in thousands)
Cash and cash equivalents$40,786 $— $— $40,786 
Equities:    
Common/collective trust at net asset value (1)
— — — 172,659 
Fixed income securities:    
Common/collective trust at net asset value (1)
— — — 426,785 
Marketable securities28,079 85,685 — 113,764 
Partnership and joint venture interests measured at net asset value (1)
— — — 22,292 
Total$68,865 $85,685 $— $776,286 
 2024
 Level 1Level 2Level 3Total
 (Dollars in thousands)
Cash and cash equivalents$12,416 $— $— $12,416 
Equities:    
Common/collective trust at net asset value (1)
— — — 156,462 
Fixed income securities:    
Common/collective trust at net asset value (1)
— — — 464,611 
Marketable securities31,298 93,763 — 125,061 
Partnership and joint venture interests measured at net asset value (1)
— — — 22,862 
Total$43,714 $93,763 $— $781,412 
(1) In accordance with ASC Topic 820-10, Fair Value Measurement, certain assets that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in the tables above are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the "Financial information on changes in projected benefit obligation, plan assets funded and balance sheet status" table above.