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Restructuring and Other Charges - Schedule of Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 28, 2020	Mar. 31, 2021	Mar. 28, 2020	Sep. 30, 2020
Restructuring Reserve [Roll Forward]
Accrual, beginning balance			$ 9,987	$ 31,086	$ 31,086
Charges to operations, net	$ 200	$ 13,200	362	26,996
Cash disbursements			(5,421)	(16,819)
Other non-cash				(281)
Foreign exchange impact			45	148
Accrual, ending balance	4,973	24,668	4,973	24,668	9,987
Accounting Standards Update 2016-02
Restructuring Reserve [Roll Forward]
ASC 842 adoption				(16,462)
Employee Severance and Related Benefits
Restructuring Reserve [Roll Forward]
Accrual, beginning balance			3,992	298	298
Charges to operations, net			163	31,358
Cash disbursements			(3,924)	(14,324)
Other non-cash				0
Foreign exchange impact			31	153
Accrual, ending balance	262	17,485	262	17,485	3,992
Employee Severance and Related Benefits \| Accounting Standards Update 2016-02
Restructuring Reserve [Roll Forward]
ASC 842 adoption				0
Facility Closures and Related Costs
Restructuring Reserve [Roll Forward]
Accrual, beginning balance			5,995	30,788	30,788
Charges to operations, net			199	(4,362)
Cash disbursements			(1,497)	(2,495)
Other non-cash				(281)
Foreign exchange impact			14	(5)
Accrual, ending balance	$ 4,711	$ 7,183	$ 4,711	7,183	$ 5,995
Facility Closures and Related Costs \| Accounting Standards Update 2016-02
Restructuring Reserve [Roll Forward]
ASC 842 adoption				$ (16,462)