Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 27, 2020	Mar. 27, 2020	Oct. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets	$ 39,900	$ 39,900
Operating lease, liability	41,032	41,032
ASU 2016-02 modified retrospective adoption			$ (1,053)
Lease, cost	4,161	8,075
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets			45,519
Operating lease, liability			46,941
Cost of sales
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease, cost	3,194	5,950
Selling, General and Administrative Expenses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease, cost	$ 967	$ 2,125
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ASU 2016-02 modified retrospective adoption			(1,053)
Accumulated Deficit | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ASU 2016-02 modified retrospective adoption			$ 1,053