Pension and Retirement Plans (Tables)

9 Months Ended

Jun. 30, 2026

Retirement Benefits [Abstract]

Schedule of net benefit costs


		Three Months Ended June 30,
		2026									2025
		U.K.			U.S.			Total			U.K.			U.S.			Total

		(Amounts in thousands)
Pension:
Interest cost		$	114		$	2		$	116		$	135		$	2		$	137
Expected return on plan assets			(114)			—			(114)			(156)			—			(156)
Amortization of past service costs			2			—			2			2			—			2
Amortization of net gain			—			(1)			(1)			—			(2)			(2)
Net periodic (benefit) cost		$	2		$	1		$	3		$	(19)		$	—		$	(19)

Post Retirement:
Service cost		$	—		$	6		$	6		$	—		$	7		$	7
Interest cost			—			16			16			—			14			14
Amortization of net gain			—			(32)			(32)			—			(29)			(29)
Net periodic benefit		$	—		$	(10)		$	(10)		$	—		$	(8)		$	(8)


		Nine Months Ended June 30,
		2026									2025
		U.K.			U.S.			Total			U.K.			U.S.			Total

		(Amounts in thousands)
Pension:
Interest cost		$	341		$	5		$	346		$	344		$	6		$	350
Expected return on plan assets			(341)			—			(341)			(400)			—			(400)
Amortization of past service costs			6			—			6			6			—			6
Amortization of net gain			—			(2)			(2)			—			(5)			(5)
Net periodic cost (benefit)		$	6		$	3		$	9		$	(50)		$	1		$	(49)

Post Retirement:
Service cost		$	—		$	18		$	18		$	—		$	20		$	20
Interest cost			—			47			47			—			44			44
Amortization of net gain			—			(95)			(95)			—			(89)			(89)
Net periodic benefit		$	—		$	(30)		$	(30)		$	—		$	(25)		$	(25)

Schedule of fair value of plan assets


		Fair Values as of
		June 30, 2026												September 30, 2025
		Fair Value Measurements Using Inputs Considered as												Fair Value Measurements Using Inputs Considered as
Asset Category		Total			Level 1			Level 2			Level 3			Total			Level 1			Level 2			Level 3

		(Amounts in thousands)
Cash on deposit		$	78		$	78		$	—		$	—		$	42		$	42		$	—		$	—
Buy-in contract*			8,297			—			—			8,297			8,428			—			—			8,428
Total plan assets		$	8,375		$	78		$	—		$	8,297		$	8,470		$	42		$	—		$	8,428

*This fair value is based on the latest information available, which is as of September 30, 2025 not June 30, 2026 as the table is labeled. The difference from September 30, 2025 is due to the Great British Pounds being converted into U.S. dollars at a different exchange rate.