Restructuring and Other Charges - Schedule of Restructuring Accrual Activity (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 31,086	$ 2,415	$ 6,244
Charges (credits) to operations, net	26,427	48,612	(1,003)
Cash disbursements	(31,502)	(24,721)	(2,756)
Foreign exchange impact	274	(32)	(70)
Restructuring reserve, ending balance	9,987	31,086	2,415
Other non-cash charges	164	4,812
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	298	0	1,736
Charges (credits) to operations, net	30,690	15,704	(509)
Cash disbursements	(27,256)	(15,402)	(1,247)
Foreign exchange impact	260	(4)	20
Restructuring reserve, ending balance	3,992	298	0
Other non-cash charges	0	0
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	30,788	2,415	4,508
Charges (credits) to operations, net	(4,263)	32,908	(494)
Cash disbursements	(4,246)	(9,319)	(1,509)
Foreign exchange impact	14	(28)	(90)
Restructuring reserve, ending balance	5,995	30,788	$ 2,415
Other non-cash charges	164	$ 4,812
Facility Closures \| Accounting Standards Update 2016-02
Restructuring Reserve [Roll Forward]
ASC 842 adoption	$ (16,462)

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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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to 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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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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Amount of decrease in the reserve for full or partial settlement through consideration other than cash.

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Amount of foreign currency translation gain (loss) which decreases (increases) the restructuring reserve.

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