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Restructuring and Other Charges - Additional Information (Details) $ in Thousands		3 Months Ended		12 Months Ended
	Oct. 02, 2019 USD ($)	Sep. 30, 2021 USD ($)	Dec. 28, 2018 USD ($) Employee	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($) Employee	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring Charges				$ (2,136)	$ (26,427)	$ (48,612)
Payments for restructuring				6,681	31,502	24,721
Restructuring and other charges, net				(2,211)	(32,716)	(51,114)
Professional fees		$ 1,700
Restructuring Reserve		5,486		5,486	9,987	31,086	$ 2,415
Depreciation				26,100	24,700	26,700
Impairment and Accretion Exited Lease Facilities
Restructuring Cost And Reserve [Line Items]
Restructuring and other charges, net				(100)	(5,600)
Accelerated Depreciation Planned Facility Exit
Restructuring Cost And Reserve [Line Items]
Restructuring and other charges, net					(700)
Facility Closures
Restructuring Cost And Reserve [Line Items]
Restructuring Charges				(249)	4,263	(32,908)
Payments for restructuring				2,756	4,246	9,319
Restructuring Reserve		3,505		3,505	5,995	30,788	2,415
Facility Closures | Accrued Expenses and Other Current Liabilities
Restructuring Cost And Reserve [Line Items]
Restructuring Reserve		2,600		2,600
Facility Closures | Other Noncurrent Liabilities
Restructuring Cost And Reserve [Line Items]
Restructuring Reserve		900		900	3,200
Facility Closures | Other Current Liabilities
Restructuring Cost And Reserve [Line Items]
Restructuring Reserve					2,800
Facility Closures | Accounting Standards Update 2016-02
Restructuring Cost And Reserve [Line Items]
ASC 842 adoption	$ 16,500
Facility Closures | Accounting Standards Update 2016-02 | Operating Lease ROU Asset
Restructuring Cost And Reserve [Line Items]
ASC 842 adoption	7,600
Facility Closures | Accounting Standards Update 2016-02 | Operating Lease Short Term Lease Obligation
Restructuring Cost And Reserve [Line Items]
ASC 842 adoption	9,200
Facility Closures | Accounting Standards Update 2016-02 | Operating Lease Long Term Lease Obligation
Restructuring Cost And Reserve [Line Items]
ASC 842 adoption	$ 14,900
Employee Severance and Related Benefits
Restructuring Cost And Reserve [Line Items]
Restructuring Charges				(1,887)	(30,690)	(15,704)
Payments for restructuring				3,925	27,256	15,402
Restructuring Reserve		$ 1,981		$ 1,981	3,992	298	$ 0
Prior Headquarters Relocation Charge
Restructuring Cost And Reserve [Line Items]
Restructuring Charges						(32,700)
Restructuring and other charges, net					4,300
Lease expiration, month and year				2022-11
Maintenance and Operating Expenses
Restructuring Cost And Reserve [Line Items]
Restructuring Charges				$ (300)
Restructuring Plan 2020
Restructuring Cost And Reserve [Line Items]
Payments for restructuring				3,900	27,300
Restructuring Plan 2020 | Employee Severance and Related Benefits
Restructuring Cost And Reserve [Line Items]
Restructuring Charges				(200)	$ (30,800)
Number of employees | Employee					250
Restructuring Plan 2020 | Restructured Facilities
Restructuring Cost And Reserve [Line Items]
Payments for restructuring				$ 2,800
Restructuring Plan 2019
Restructuring Cost And Reserve [Line Items]
Payments for restructuring					$ 3,900	23,600
Restructuring Plan 2019 | Employee Severance and Related Benefits
Restructuring Cost And Reserve [Line Items]
Restructuring Charges			$ (16,300)		100
Number of employees | Employee			240
2016 and 2019 Restructuring Plans
Restructuring Cost And Reserve [Line Items]
Restructuring Charges						(48,600)
Prior Year Plans | Facility Closures
Restructuring Cost And Reserve [Line Items]
Restructuring Charges						(200)
Prior Headquarters Relocation Charge | Facility Closures
Restructuring Cost And Reserve [Line Items]
Restructuring and other charges, net						(2,500)
Prior Headquarters | Facility Closures
Restructuring Cost And Reserve [Line Items]
Depreciation						1,900
Payments for Rent						600
Prior Restructuring
Restructuring Cost And Reserve [Line Items]
Payments for restructuring					$ 300	$ 1,100

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