Leases - Components of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2021	Mar. 29, 2020	Mar. 28, 2021	Mar. 29, 2020
Leases [Abstract]
Operating lease cost	$ 22,640	$ 21,595	$ 44,709	$ 42,767
Sublease income	(30)	(541)	(59)	(1,115)
Other	0	18	0	36
Total lease cost	$ 22,610	$ 21,072	$ 44,650	$ 41,688