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Benefit Plans (Tables)
 12 Months Ended
Aug. 31, 2024
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, 2024 and 2023, is as follows:
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202420232024202320242023
 (Dollars in thousands)
Change in benefit obligation:      
Projected benefit obligation at beginning of period$708,511 $759,173 $20,980 $18,257 $22,572 $24,524 
Service cost37,391 38,579 1,968 1,840 650 670 
Interest cost35,928 30,588 1,043 741 1,144 1,035 
Actuarial loss (gain):
Experience study and mortality updates2,988 2,573 244 159 — — 
Other demographic experience*18,647 5,181 3,217 1,999 1,465 (553)
Discount rate change21,372 (45,216)626 (876)681 (1,312)
Plan amendments223 490 — — — — 
Benefits paid(64,297)(82,857)(1,635)(1,140)(1,725)(1,792)
Projected benefit obligation at end of period$760,763 $708,511 $26,443 $20,980 $24,787 $22,572 
Change in plan assets:      
Fair value of plan assets at beginning of period$736,150 $787,422 $— $— $— $— 
Actual (loss) gain on plan assets67,559 (8,415)— — — — 
Company contributions42,000 40,000 1,635 1,140 1,725 1,792 
Benefits paid(64,297)(82,857)(1,635)(1,140)(1,725)(1,792)
Fair value of plan assets at end of period$781,412 $736,150 $— $— $— $— 
Funded status at end of period$20,649 $27,639 $(26,443)$(20,980)$(24,787)$(22,572)
Amounts recognized on balance sheet:      
Noncurrent assets$20,649 $27,639 $— $— $— $— 
Accrued benefit cost:
Current liabilities— — (3,950)(2,880)(2,080)(2,170)
Noncurrent liabilities— — (22,493)(18,100)(22,707)(20,402)
Ending balance$20,649 $27,639 $(26,443)$(20,980)$(24,787)$(22,572)
Amounts recognized in accumulated other comprehensive loss (pretax):      
Prior service cost (credit)$1,216 $1,172 $(47)$(160)$(935)$(1,380)
Net loss (gain)269,122 247,609 8,001 4,294 (14,335)(18,096)
Ending balance$270,338 $248,781 $7,954 $4,134 $(15,270)$(19,476)
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,
20242023
(Dollars in thousands)
Projected benefit obligation$26,443 $20,980 
Accumulated benefit obligation26,173 20,908 
Schedule of net benefit costs of assumptions used Components of net periodic benefit costs for the years ended August 31, 2024, 2023 and 2022, are as follows:
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
202420232022202420232022202420232022
(Dollars in thousands)
Components of net periodic benefit costs:
Service cost$37,391 $38,579 $46,275 $1,968 $1,840 $926 $650 $670 $996 
Interest cost35,928 30,588 17,167 1,043 741 281 1,144 1,035 503 
Expected return on assets(47,860)(43,129)(43,958)— — — — — — 
Prior service cost (credit) amortization178 149 174 (114)(114)(114)(445)(445)(445)
Actuarial loss (gain) amortization1,796 1,872 23,406 380 245 478 (1,616)(1,615)(1,259)
Net periodic benefit cost (benefit)$27,433 $28,059 $43,064 $3,277 $2,712 $1,571 $(267)$(355)$(205)
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, 2024, 2023 and 2022, are as follows:
Qualified
Pension Benefits		Nonqualified
Pension Benefits		Other Benefits
 202420232022202420232022202420232022
 (Dollars in thousands)
Other comprehensive loss (income):         
Prior service cost$223 $490 $132 $— $— $— $— $— $— 
Net actuarial loss (gain)23,309 14,082 59,020 4,087 1,282 (1,537)2,145 (1,865)(4,243)
Amortization of actuarial (gain) loss(1,796)(1,872)(23,406)(380)(245)(478)1,616 1,615 1,259 
Amortization of prior service (credit) costs(178)(149)(174)114 114 114 445 445 445 
Settlement of retiree obligations (a)— — — — — (307)— — — 
Total recognized in other comprehensive loss (income)$21,558 $12,551 $35,572 $3,821 $1,151 $(2,208)$4,206 $195 $(2,539)
(a) Reflects amounts reclassified from accumulated other comprehensive loss (income) to net earnings
Schedule of amounts in accumulated other comprehensive income (loss) to be recognized over next fiscal year stimated amortization in fiscal 2025 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)$199 $(47)$(445)
Amortization of actuarial loss (gain)12,815 799 (1,192)
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$190 $160 
Effect on postretirement benefit obligation1,600 1,400 
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)
2025$69,800 $3,950 $2,080 
202672,100 4,080 2,020 
202773,200 3,870 1,990 
202875,900 3,560 1,870 
202978,600 3,330 1,780 
2030-2034366,500 14,350 8,690 
Schedule of defined benefit plans, fair value disclosure Our pension plans' recurring fair value measurements by asset category as of August 31, 2024 and 2023, are presented in the tables below:
 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:    
   Other investments31,298 93,763 — 125,061 
Common/collective trust at net asset value (1)
— — — 464,611 
Partnership and joint venture interests measured at net asset value (1)
— — — 22,862 
Total$43,714 $93,763 $— $781,412 
 2023
 Level 1Level 2Level 3Total
 (Dollars in thousands)
Cash and cash equivalents$12,505 $— $— $12,505 
Equities:    
Common/collective trust at net asset value (1)
— — — 127,225 
Fixed income securities:    
Other investments25,143 86,315 — 111,458 
Common/collective trust at net asset value (1)
— — — 425,180 
Partnership and joint venture interests measured at net asset value (1)
— — — 59,782 
Total$37,648 $86,315 $— $736,150 
(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.