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Defined Benefit Pension Plan - Additional Information (Details) $ in Millions	6 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2026 GBP (£)	Mar. 31, 2025 GBP (£)
Defined benefit pension plan
Net periodic pension cost (benefit) | $	$ 0.1	$ 0.1
Maximum
Defined benefit pension plan
Expected contributions | £			£ 10,000,000	£ 10,000,000

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