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Pension Plans - Change in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Before Tax [Roll Forward]
Beginning balance	$ 1,438,248	$ 1,201,998
Ending balance	2,038,468	1,438,248
Pension Plan
AOCI Attributable to Parent, Before Tax [Roll Forward]
Beginning balance	37,175	34,920
Recognized during year - net actuarial losses	(4,135)	(3,850)
Occurring during year - net actuarial losses	(2,640)	3,460
Foreign exchange impact	(187)	2,645
Ending balance	$ 30,213	$ 37,175

X

- Definition

Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Foreign Currency Translation Gain (Loss) Arising During Period, Net of Tax

+ References

No definition available.

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Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Occurring During Period, Before Tax

+ References

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Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Recognized During Period, Before Tax

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
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