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Defined Benefit Pension Plan (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 GBP (£)
Retirement Benefits [Abstract]
Guarantee obligation value, maximum | £					£ 10,000,000
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	109	154	217	311
Expected return on plan assets	(204)	(229)	(404)	(473)
Amortization of prior service cost	5	0	10	0
Total net periodic (benefit)	$ (90)	$ (75)	$ (177)	$ (162)

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