Restructuring and Other Charges - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		32 Months Ended
	Jun. 30, 2018 USD ($)	Jul. 01, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jul. 01, 2017 USD ($)	Jun. 30, 2018 USD ($) employee
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges, net	$ 1,627	$ 1,551	$ 1,846	$ 8,300	$ 84,500
Restructuring and Related Cost, Number of Positions Eliminated | employee					800
Headquarters relocation charges	1,900		2,900
Facility closures and related costs
Restructuring Cost and Reserve [Line Items]
Assumed Sublease Income	3,100		3,100		$ 3,100
Accrued Expenses and Other Current Liabilities [Member] | Facility closures and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,600		1,600		1,600
Other Noncurrent Liabilities [Member] | Facility closures and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 1,100		$ 1,100		$ 1,100