Pension Plan and Retirement Benefits - Defined Benefit Plans - Expense (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2007	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Pension Plan and Retirement Benefits
Accrued pension and postretirement benefits		$ 77,521	$ 101,350
Defined Benefit Pension Plan
Pension Plan and Retirement Benefits
Pension plan expense		(1,921)	4,713	$ 6,867
Accrued pension and postretirement benefits		12,954	17,763
Contribution to plan		6,000	21,000
Projected benefit obligation		231,275	315,466	345,390
Pension Plans Defined Benefit Us [Member]
Pension Plan and Retirement Benefits
Contribution to plan		6,000	21,000	6,000
Pension Plans Defined Benefit Non Us [Member]
Pension Plan and Retirement Benefits
Contribution to plan		0	0	517
Non Qualified Pension Plans Defined Benefit [Member]
Pension Plan and Retirement Benefits
Pension plan expense		3	37	57
Accrued pension and postretirement benefits		530	623
Defined Benefit Other Postretirement Benefit Plan
Pension Plan and Retirement Benefits
Pension plan expense		3,819	3,387	6,757
Accrued pension and postretirement benefits		64,037	82,964
Maximum liability related to total retiree health care costs under plan amendment	$ 5,000
Contribution to plan		2,643	2,819
Projected benefit obligation		64,037	$ 82,964	$ 93,339
UNITED STATES
Pension Plan and Retirement Benefits
Projected benefit obligation		223,871
Pension Plans Defined Benefit Non US
Pension Plan and Retirement Benefits
Projected benefit obligation		$ 7,404