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Restructuring and Other Charges - Schedule of Restructuring Accrual Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 9,987	$ 31,086	$ 2,415
Charges (credits) to operations, net	2,136	26,427	48,612
Cash disbursements	(6,681)	(31,502)	(24,721)
Other non-cash charges		164	4,812
Foreign exchange impact	44	274	(32)
Restructuring reserve, ending balance	5,486	9,987	31,086
Accounting Standards Update 2016-02
Restructuring Reserve [Roll Forward]
ASC 842 adoption		(16,462)
Employee Severance and Related Benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	3,992	298	0
Charges (credits) to operations, net	1,887	30,690	15,704
Cash disbursements	(3,925)	(27,256)	(15,402)
Other non-cash charges		0	0
Foreign exchange impact	27	260	(4)
Restructuring reserve, ending balance	1,981	3,992	298
Employee Severance and Related Benefits | Accounting Standards Update 2016-02
Restructuring Reserve [Roll Forward]
ASC 842 adoption		0
Facility Closures
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	5,995	30,788	2,415
Charges (credits) to operations, net	249	(4,263)	32,908
Cash disbursements	(2,756)	(4,246)	(9,319)
Other non-cash charges		164	4,812
Foreign exchange impact	17	14	(28)
Restructuring reserve, ending balance	$ 3,505	5,995	$ 30,788
Facility Closures | Accounting Standards Update 2016-02
Restructuring Reserve [Roll Forward]
ASC 842 adoption		$ (16,462)

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

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