Pension Plans (Tables)

12 Months Ended

Sep. 30, 2025

Retirement Benefits [Abstract]

Accounting For The Pension Plans

The following table presents the actuarial assumptions used in accounting for the pension plans:

	2025			2024			2023
Weighted average assumptions used to determine benefit obligations at September 30 measurement date:
Discount rate		3.8	%		3.3	%		4.2	%
Rate of increase in future compensation		3.0	%		3.0	%		3.0	%
Weighted average assumptions used to determine net periodic pension cost for fiscal years ended September 30:
Discount rate		3.3	%		4.2	%		3.7	%
Rate of increase in future compensation		3.0	%		3.0	%		3.6	%
Rate of return on plan assets		4.8	%		4.8	%		4.8	%

Components of Net Periodic Pension Cost

All non-service net periodic pension costs are presented in Other income, net on the Consolidated Statement of Operations. The actuarially computed components of net periodic pension cost recognized in our Consolidated Statements of Operations for each year are shown below:

(in thousands)	Year ended September 30,
	2025			2024			2023
Interest cost of projected benefit obligation	$	2,121		$	2,368		$	2,126
Service cost		578			674			690
Expected return on plan assets		(3,700	)		(3,361	)		(3,541	)
Amortization of prior service cost		—			—			—
Recognized actuarial loss		697			398			241
Settlement gain		(65	)		(19	)		—
Net periodic pension (benefit) cost	$	(369	)	$	60		$	(484	)

Change in Benefit Obligation and Plan Assets

The following tables display the change in benefit obligation and the change in the plan assets and funded status of the plans as well as the amounts recognized in our Consolidated Balance Sheets:

(in thousands)	Year ended September 30,
	2025			2024
Change in benefit obligation:
Projected benefit obligation, beginning of year	$	70,242		$	60,433
Service cost		578			674
Interest cost		2,121			2,368
Actuarial loss (gain)		(2,818	)		7,128
Foreign exchange impact		2,896			3,319
Participant contributions		93			100
Benefits paid		(2,711	)		(3,162	)
Settlements		(941	)		(618	)
Projected benefit obligation, end of year	$	69,460		$	70,242
Change in plan assets and funded status:
Plan assets at fair value, beginning of year	$	77,757		$	68,875
Actual return on plan assets		2,563			5,120
Employer contributions		3,238			3,697
Participant contributions		93			100
Foreign exchange impact		3,775			3,745
Settlements		(941	)		(618	)
Benefits paid		(2,711	)		(3,162	)
Plan assets at fair value, end of year		83,774			77,757
Projected benefit obligation, end of year		69,460			70,242
Underfunded status	$	(11,367	)	$	(12,438	)
Overfunded status	$	25,681		$	19,953
Accumulated benefit obligation, end of year	$	68,996		$	69,580
Amounts recognized in the balance sheet:
Non-current asset	$	25,681		$	19,953
Non-current liability	$	(10,979	)	$	(12,083	)
Current liability	$	(388	)	$	(355	)
Amounts in accumulated other comprehensive loss:
Unrecognized actuarial loss	$	13,620		$	15,230

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year

The following table shows the change in Accumulated other comprehensive loss:

(in thousands)	Year ended September 30,
	2025			2024
Accumulated other comprehensive loss, beginning of year	$	15,230		$	9,573
Recognized during year - amortization of net actuarial losses		(697	)		(398	)
Occurring during year - effect of settlement		65			19
Occurring during year - net actuarial losses (gains)		(1,681	)		5,369
Foreign exchange impact		703			667
Accumulated other comprehensive loss, end of year	$	13,620		$	15,230

Percentage of Total Plan Assets

The following table shows the percentage of total plan assets for each major category of plan assets:

	September 30,
Asset category	2025			2024
Equity securities		19	%		12	%
Fixed income securities		57	%		62	%
Commodities		6	%		6	%
Insurance company funds		8	%		9	%
Cash		10	%		11	%
		100	%		100	%

Expected Future Benefit Payments

As of September 30, 2025, benefit payments expected to be paid over the next ten years are as follows:

(in thousands)	Future Benefit Payments
2026	$	4,402
2027	$	5,072
2028	$	5,061
2029	$	5,164
2030	$	5,209
2031 to 2035	$	27,064

Fair Value of Plan Assets

(in thousands)	September 30, 2025
	Level 1		Level 2		Level 3		Total
Fixed income securities:
Government	$	47,554	$	—	$	—	$	47,554
Equities in funds		15,709		—		—		15,709
Commodities		5,077		—		—		5,077
Insurance company funds(1)		—		6,867		—		6,867
Cash		8,538		—		—		8,538
Options		29		—		—		29
Total plan assets	$	76,907	$	6,867	$	—	$	83,774

(in thousands)	September 30, 2024
	Level 1		Level 2		Level 3		Total
Fixed income securities:
Government	$	48,146	$	—	$	—	$	48,146
Equities in funds		9,550		—		—		9,550
Commodities		4,309		—		—		4,309
Insurance company funds(1)		—		7,385		—		7,385
Cash		8,277		—		—		8,277
Options		90		—		—		90
Total plan assets	$	70,372	$	7,385	$	—	$	77,757

(1)These investments are comprised primarily of funds invested with an insurance company in Japan with a guaranteed rate of return. The insurance company invests these assets primarily in government and corporate bonds.