Benefits and Pension Plans (Tables)

12 Months Ended

Aug. 31, 2022

Pensions and Other Postretirement Benefits

Schedule of the status of the Company's pension plans

	Year Ended August 31,
	2022		2021		2020
Change in benefit obligation
Projected benefit obligation at beginning of year	$	20,261	$	20,663	$	20,087
Service cost		382		366		295
Interest cost		384		341		451
Actuarial (gain) loss		(2,202)		645		2,253
Benefits paid		(2,027)		(1,754)		(2,423)
Projected benefit obligation at end of year	$	16,798	$	20,261	$	20,663
Change in plan assets
Fair value of plan assets at beginning of year	$	9,280	$	8,168	$	7,859
Actual return on plan assets		(1,369)		1,301		868
Employer contribution		1,917		1,565		1,864
Benefits paid		(2,026)		(1,754)		(2,423)
Fair value of plan assets at end of year	$	7,802	$	9,280	$	8,168
Funded status at end of year	$	(8,996)	$	(10,981)	$	(12,495)

	Year Ended August 31,
	2022		2021		2020
Amounts recognized in consolidated balance sheets
Noncurrent assets	$	—	$	—	$	—
Current liabilities		(1,565)		(1,565)		(1,565)
Noncurrent liabilities		(7,431)		(9,416)		(10,930)
Net amount recognized in consolidated balance sheets	$	(8,996)	$	(10,981)	$	(12,495)
Actuarial present value of benefit obligation and funded status
Accumulated benefit obligations	$	15,093	$	17,898	$	18,307
Projected benefit obligations	$	16,798	$	20,261	$	20,663
Plan assets at fair value	$	7,802	$	9,280	$	8,168
Amounts recognized in accumulated other comprehensive income
Prior service cost	$	37	$	40	$	44
Net actuarial loss		8,659		9,674		10,595
Adjustment to pre-tax accumulated other comprehensive income	$	8,696	$	9,714	$	10,639

	Year Ended August 31,
	2022		2021		2020
Other changes in plan assets and benefit obligations recognized in other comprehensive income
Net (gain)/loss	$	(439)	$	(884)	$	711
Amortization of loss		(593)		(656)		(664)
Supplemental plan assumption change		17		619		1,065
Amortization of prior service cost		(3)		(3)		(3)
Effect of settlement on accumulated other comprehensive income		—		—		(155)
Total recognized in other comprehensive income		(1,018)		(924)		954
Net periodic pension cost		951		975		1,178
Total recognized in net periodic pension cost and other comprehensive income	$	(67)	$	51	$	2,132
Estimated amounts that will be amortized from accumulated comprehensive income over the next fiscal year
Prior service cost	$	3	$	3	$	3
Net actuarial loss		594		593		656

Schedule of components of net periodic benefit cost

	2022		2021		2020
Components of net periodic benefit cost
Service cost	$	382	$	366	$	295
Interest cost		384		341		451
Expected return on plan assets		(411)		(391)		(390)
Amortization of prior service cost		3		3		3
Amortization of accumulated loss		593		656		664
Curtailment and settlement loss		—		—		155
Net periodic benefit cost	$	951	$	975	$	1,178

Schedule of weighted-average assumptions used to determine benefit obligations

	2022		2021		2020
Discount rate
Qualified plan	4.21	%	2.15	%	1.92	%
Supplemental plan	4.36	%	1.95	%	1.65	%
NEPTCO plan	—	%	—	%	—	%
Rate of compensation increase
Qualified and Supplemental plan	3.50	%	3.50	%	3.50	%
NEPTCO plan	—	%	—	%	—	%

Schedule of weighted-average assumptions used to determine net periodic benefit cost

	2022		2021		2020
Discount rate
Qualified plan	2.15	%	1.92	%	2.58	%
Supplemental plan	1.95	%	1.65	%	2.37	%
NEPTCO plan	—	%	—	%	2.29	%
Expected long-term return on plan assets
Qualified plan	4.85	%	5.25	%	5.60	%
Supplemental plan	—	%	—	%	—	%
NEPTCO plan	—	%	—	%	5.60	%
Rate of compensation increase
Qualified and Supplemental plan	3.50	%	3.50	%	3.50	%
NEPTCO plan	—	%	—	%	—	%

Schedule of pension plans' assets by asset category

			Fair value measurements at								Fair value measurements at
			August 31, 2022								August 31, 2021
					Significant								Significant
			Quoted prices		other		Significant				Quoted prices		other		Significant
			in active		observable		unobservable				in active		observable		unobservable
	August 31,		markets		inputs		inputs		August 31,		markets		inputs		inputs
	2022		(Level 1)		(Level 2)		(Level 3)		2021		(Level 1)		(Level 2)		(Level 3)
Asset Category
Equity securities	$	3,667	$	3,667	$	—	$	—	$	4,241	$	4,241	$	—	$	—
Debt securities		4,135		4,135		—		—		5,039		5,039		—		—
Total	$	7,802	$	7,802	$	—	$	—	$	9,280	$	9,280	$	—	$	—

Schedule of pension benefit payments (which include expected future service) expected to be paid

Year ending August 31,	Pension Benefits
2023	$	3,413
2024		2,004
2025		1,830
2026		1,802
2027		1,322
2028-2032	$	4,221

Qualified Plan.

Pensions and Other Postretirement Benefits

Schedule of target allocation and weighted-average asset allocations

	Target
	Allocation		Percentage of Plan Assets as of August 31,
Asset Category	Range		2022		2021		2020
Equity securities	10-80	%	47	%	46	%	49	%
Debt securities	20-75	%	53	%	54	%	51	%
Other	0-100	%	—	%	—	%	—	%
Total	100	%	100	%	100	%	100	%