Pension and Retirement Plans - Changes of the benefit obligation, the plan assets and funded status of the plans (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Changes in actuarial assumptions		$ 100
Benefits paid	$ (900)
Fair Value of Plan Assets, Beginning Balance			$ 11,921
Fair Value of Plan Assets, Ending Balance			8,825	$ 11,921
Pension:
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation			14,656	14,829
Interest cost			279	254
Changes in actuarial assumptions			(4,595)	(664)
Foreign exchange impact			(1,873)	670
Benefits paid			(480)	(433)
Projected benefit obligation			7,987	14,656
Fair Value of Plan Assets, Beginning Balance			11,921	9,740
Actual gain on plan assets			(1,026)	1,655
Company contributions			321	549
Foreign exchange impact			(1,911)	410
Benefits paid			(480)	(433)
Fair Value of Plan Assets, Ending Balance			8,825	11,921
Funded status \ net amount recognized			838	(2,735)
Pension: | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation			339	426
Interest cost			11	11
Changes in actuarial assumptions			(21)	(6)
Benefits paid			(68)	(92)
Projected benefit obligation			261	339
Company contributions			68	92
Benefits paid			(68)	(92)
Funded status \ net amount recognized			(261)	(339)
Pension: | International
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation			14,317	14,403
Interest cost			268	243
Changes in actuarial assumptions			(4,574)	(658)
Foreign exchange impact			(1,873)	670
Benefits paid			(412)	(341)
Projected benefit obligation			7,726	14,317
Fair Value of Plan Assets, Beginning Balance			11,921	9,740
Actual gain on plan assets			(1,026)	1,655
Company contributions			253	457
Foreign exchange impact			(1,911)	410
Benefits paid			(412)	(341)
Fair Value of Plan Assets, Ending Balance			8,825	11,921
Funded status \ net amount recognized			1,099	(2,396)
Post Retirement:
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation			1,670	1,703
Service cost			44	45
Interest cost			46	42
Changes in actuarial assumptions			(574)	(120)
Projected benefit obligation			1,186	1,670
Funded status \ net amount recognized			(1,186)	(1,670)
Post Retirement: | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation			1,670	1,703
Service cost			44	45
Interest cost			46	42
Changes in actuarial assumptions			(574)	(120)
Projected benefit obligation			1,186	1,670
Funded status \ net amount recognized			$ (1,186)	$ (1,670)